"Projections"->"Warp (Reproject)". The tool performs three things as part of this process: It unprojects the data into geographic coordinates (latitude and longitude). Also called Babinet, elliptical, homolographic, or homalographic, Carl B. Mollweide created this pseudo cylindrical projection in 1805. rev 2021.2.5.38499, The best answers are voted up and rise to the top, Geographic Information Systems Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. For Custom Geographic Transformation, select LONGITUDE_ROTATION. Projecting data. Finally, the data are neither conformal, perspective, nor equidistant (USGS 2000). The black is the shoreline produced with LONGITUDE_ROTATION, the red is it produced with GEOCENTRIC_TRANSLATION. Prerequisite Skills This booklet assumes that you have completed the … It is hard to find information on this projection. For this parameter, you must provide a Python expression that can calculate the name of an output raster given the input HDF name. I have never seen ESRI documentation on the various transformation methods. I suspect it is some group at NASA Goddard Space Flight Center (GSFC). It could be that the projection procedure used by ESRI is different than that used by the MODIS data provider. If an elliptically-shaped aerofoil gives the optimum lift distribution, why aren't propeller blades designed around this ideal? Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the projection over the oceans and by … The Mercator projection (/ m ər ˈ k eɪ t ər /) is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. First, open the Create Custom Geographic Transformation and fill in the four inputs as follows: The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. Please edit your question and show us what went wrong. In this case we use the gshhs_f.shp that we created previously. The output in ArcMap looks like this. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Home Questions Tags Users Unanswered Converting sinusoidal to … This article is about converting the GK (Gauss-Krüger) coordinates into WGS 84 (Latitude/Longitude) Background: In cartography, the term Gauss–Krüger Geographic coordinate system is named after Carl Friedrich Gauss (1777-1855) and Johann Heinrich Louis Krüger. This makes ArcMap pretty slow. It takes a lot of times, and R crash (I obtain a message R session aborted). I coded the image so that the value 3 was blue and all other values were green. MGET includes two batch-conversion tools. According to the ​LP DAAC page, the value 3 (binary 11) indicates that the "LST [was] not produced primarily due to reasons other than cloud". In order to … The best I have found is an ​NSIDC web page that describes their MODIS/Terra Snow Cover Daily L3 Global 500m Grid, Version 5 product. Just taking a shot here.. New England). When snow falls, temperature rises. Asking for help, clarification, or responding to other answers. We obtained the GSHHS shoreline by downloading the GSHHS 2.0 shapefiles available on the ​GSHHS website. sinusoidal projection n. An equal-area map projection in which parallels and the prime meridian are straight lines and the other meridians are increasingly... Sinusoidal projection - … This tool converts coordinates from one datum to another datum. Coordinate conversion is composed of a number of different types of conversion: format change of geographic coordinates, conversion of coordinate systems, or transformation to different … Why does adding one character to my MySQL password lock me out? Select the data layer (s) you wish to use and the new file will be in the sinusoidal projection. That page provides the following description: In the sinusoidal projection, areas on the data grids are proportional to the same areas on the Earth, and distances are correct along all parallels and the central meridian. Finally, if you have ArcGIS 9.2 or later, you can use ArcGIS's own batch processing capability. You can then save your re-projected raster, load it into R and keep going from there.. Each tile consists of a 1200 km by 1200 km data array, which corresponds to 2400 by 2400 cells at 500 m resolution. Some comments in the ​ESRI forum thread indicate that the goal of this exercise was to create a "null transformation" and rely on ArcGIS's capability of automatically translating coordinates between ellipsoids and spheres. My understanding is, at the time of this writing, MODIS data is at Version 5 (V5) and using a Sinusoidal Grid projection. Now we can populate all of the mandatory fields of the tool, along with the NODATA Value, which we looked up in the Layers tab above. If you find anything out about this specific dataset, please contact me so I can update this description. In this example, we will make a map using the GSHHS full resolution shoreline, which is in the WGS 1984 geographic coordinate system. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. If you use one of these rounded-off values, your grid may appear to have a geolocation error. Visit the Trac open source project athttp://trac.edgewall.org/, MOD11A1.A2006034.h17v03.005.2008074151903.hdf, MOD11A1.A2008006.h16v07.005.2008007232041.hdf, MOD11A1.A2008004.h12v04.005.2008006021326.hdf, MOD11A1.A2008018.h13v13.005.2008019174742.hdf, MOD11A1.A2008004.h28v12.005.2008006022646.hdf, Find HDFs and Convert SDS to ArcGIS Rasters, Convert SDS in HDFs Listed in Table To ArcGIS Rasters. The area of any region is true. I use the following code, where I'm loading first the convert tiff file (and found TIFF fill for the specific year, here 2000). I am trying to convert a global map from sinusoidal to wgs84. Converting these data to ArcGIS-compatible formats can be tricky. I do know that the forum thread's suggestion of using GEOCENTRIC_TRANSLATION and leaving the parameters set to zero, rather than using LONGITUDE_ROTATION (which has no parameters), does not seem to work. At the time of this writing, MGET was not included in that list yet it can be use to convert the data. // Some projection that is suitable for your area of interest. Could receiving a URL link, not clicking on it, ever pose a security problem? Other methods, such as NADCON and NTv2, use a grid of differences and convert … In this tool, you must provide a table with two fields: one for the input HDF and one for the output raster. Faster if you have mutlpile rasters to convert, and faster than raster package. This tool allows you to search a directory tree and select files using a wildcard. These and many other products can be obtained through NASA's ​Warehouse Inventory Search Tool (WIST). Sign up to join this community. It depicts a hemisphere of … In the UK, can a landlord/agent add new tenants to a joint tenancy agreement without the consent of the current tenants? Meridians are represented by sinusoidal curves except for the central meridian, and parallels are represented by straight lines. The north-south scale is the same everywhere at the central meridian, and the east-west scale is throughout the map the same as that; correspondingly, on the map, as in reality, the length of each parallel is proportional to the cosine of the latitude; thus the shape of the map … This tool can convert a dataset from a spherical coordinate system with angular units (such as Geographic) to a planar coordinate system with linear units. It is typically stated that this projection is area-preserving, meaning that while shapes and angles may be distorted, the ratio of the area of any region calculated in the projected coordinates to the area measured on the surface of the globe … Below, we show how to use MGET's HDF conversion tools to convert land surface temperature (LST) data from LP DAAC's ​MODIS/Terra Land Surface Temperature & Emissivity Daily L3 Global 1km dataset (MOD11A1) to ArcInfo Binary Grid format. The level of zoom is different in each image. Sign up to join this community. We can assume this because only one radius is provided, 6371007.181000 m. This value appears to be the ​authalic radius for WGS 84; if you compute the authalic radius using the a and b parameters for WGS 84, you get this value. in the Africa and Patagonia image). This tile is horizontal number 17, vertical number 3. Starting with Version 4, data providers began using a "Sinusoidal Grid" projection. To a normal ellipsoid/WGS84 one that is compatible with other datasets I'm analyzing. I tried with only one year, and when it works (after restarting R session after loading the raster for example) I have a similar issue to this person, where I have only data in the "northern" hemisphere : Converting sinusoidal to WGS - MODIS TIFF file too big with R, https://stackoverflow.com/questions/36772341/reading-hdf-files-into-r-and-converting-them-to-geotiff-rasters, https://lpdaac.usgs.gov/products/mod17a3hgfv006/, Sequencing your DNA with a USB dongle and open source code, Podcast 310: Fix-Server, and other useful command line utilities, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues, Layers in QGIS that Should Align Don't (but do in FME), QGIS 3.10 not recognising projection information from raster created using GDAL, QGIS 3.12 issues unknown CRS on vector shapefile layer, Etiquette for replying to eager HR acting as intermediary. Now, under Post-conversion processing, we need to fill in Define coordinate system with a custom sinusoidal projection based on the MODIS 6371007.181 m sphere: After filling this in as shown, click Finish, Finish, OK to get back to the Convert SDS in HDF to ArcGIS Raster tool. The SDS name is available in the HDF file header (see the main HDF example for how to extract and interpret this) but it is also available on LP DAAC's ​web page for this dataset, under the Layers tab, along with other useful information: We can calculate the X and Y coordinates of the lower left corner of the tile using the formulas I listed above. This toolset contains tools to convert geographic data from one map projection to another. I've read this solution , and this , and this , and others. Several coordinate conversion tools already exist, however, here is what makes the strength of TWCC: This tool is intuitive and easy to use. The central meridian and parallels are straight lines of true scale (Pearson 1990). In geodesy, conversion among different geographic coordinate systems is made necessary by the different geographic coordinate systems in use across the world and over time. In others, it appears that the image is shifted relative to the shoreline by a cell or two (e.g. construct a .DBF table with Microsoft Excel, construct a .CSV file with a text editor, etc.). You can view and edit the … Define sinusoidal projection. Next, we specify the name of the Scientific Data Set (SDS) contained in the HDF that represents the grid that we want to extract. Many MODIS data products are organized in a tile grid based on a sinusoidal projection. In some cases, it appears that land extends beyond the shoreline (e.g. Examples of pseudocylindrical projections include: Sinusoidal, which was the first pseudocylindrical projection developed. The default expression: os.path.join(outputWorkspace, os.path.dirname(inputFile[len(directoryToSearch)+1:]), os.path.basename(inputFile).split(u'.')[0][:13]). In this case we use the gshhs_f.shp that we created previously. When you obtain GIS data, it often needs to be transformed or projected. To learn more, see our tips on writing great answers. We can do some math on the values of NSIDC's Table 2: Tile width or height = earth width / 36 = (20015109.354 + 20015109.354) / 36 = 1111950.5196666666 m, Cell size = tile width / cells = 1111950.5196666666 / 2400 = 463.31271652777775 m, X coordinate of tile lower-left corner = -20015109.354 + horizontal tile number * tile width, Y coordinate of tile lower-left corner = -10007554.677 + (17 - vertical tile number) * tile height. Hello! The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. It only takes a minute to sign up. All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data. By Edgewall Software. refvecToGeoRasterReference — Convert a referencing vector to a geographic raster reference object. Since there is no perfect way to transpose a curved surface to a flat surface without some … This is the python source. Add ribbon of most used commands-How it could be implemented? If you have not converted HDFs with MGET before, you may want to review that example before proceeding. If you have 9.1, you can probably use the second method below. I finally use mosaic_rasters, to combine all the different TIFF files together. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. Projection Wizard is a web application that helps cartographers select an appropriate projection for their map. In this case, we will choose LST_Night_1km, which is the nighttime land surface temperature. It is a particular set of transverse Mercator projections (map projections) used in narrow zones in … Once you have determined the parameters needed to convert one tile, you can easily convert a batch of tiles using these values. A difference of a meter or two per cell may not seem like much, but for a 1200x1200 grid, that adds up to one or two cells of cumulative error. The second component of the HDF name, which contains the date of the image, may be more unique, resulting in names like A2006034. White Manna Pan, Tamil Mokkai Kelvi, Cake Home Delivery In Kannur, Room Thermostat Installation, Shophouse For Rent Bangkok, " /> "Projections"->"Warp (Reproject)". The tool performs three things as part of this process: It unprojects the data into geographic coordinates (latitude and longitude). Also called Babinet, elliptical, homolographic, or homalographic, Carl B. Mollweide created this pseudo cylindrical projection in 1805. rev 2021.2.5.38499, The best answers are voted up and rise to the top, Geographic Information Systems Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. For Custom Geographic Transformation, select LONGITUDE_ROTATION. Projecting data. Finally, the data are neither conformal, perspective, nor equidistant (USGS 2000). The black is the shoreline produced with LONGITUDE_ROTATION, the red is it produced with GEOCENTRIC_TRANSLATION. Prerequisite Skills This booklet assumes that you have completed the … It is hard to find information on this projection. For this parameter, you must provide a Python expression that can calculate the name of an output raster given the input HDF name. I have never seen ESRI documentation on the various transformation methods. I suspect it is some group at NASA Goddard Space Flight Center (GSFC). It could be that the projection procedure used by ESRI is different than that used by the MODIS data provider. If an elliptically-shaped aerofoil gives the optimum lift distribution, why aren't propeller blades designed around this ideal? Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the projection over the oceans and by … The Mercator projection (/ m ər ˈ k eɪ t ər /) is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. First, open the Create Custom Geographic Transformation and fill in the four inputs as follows: The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. Please edit your question and show us what went wrong. In this case we use the gshhs_f.shp that we created previously. The output in ArcMap looks like this. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Home Questions Tags Users Unanswered Converting sinusoidal to … This article is about converting the GK (Gauss-Krüger) coordinates into WGS 84 (Latitude/Longitude) Background: In cartography, the term Gauss–Krüger Geographic coordinate system is named after Carl Friedrich Gauss (1777-1855) and Johann Heinrich Louis Krüger. This makes ArcMap pretty slow. It takes a lot of times, and R crash (I obtain a message R session aborted). I coded the image so that the value 3 was blue and all other values were green. MGET includes two batch-conversion tools. According to the ​LP DAAC page, the value 3 (binary 11) indicates that the "LST [was] not produced primarily due to reasons other than cloud". In order to … The best I have found is an ​NSIDC web page that describes their MODIS/Terra Snow Cover Daily L3 Global 500m Grid, Version 5 product. Just taking a shot here.. New England). When snow falls, temperature rises. Asking for help, clarification, or responding to other answers. We obtained the GSHHS shoreline by downloading the GSHHS 2.0 shapefiles available on the ​GSHHS website. sinusoidal projection n. An equal-area map projection in which parallels and the prime meridian are straight lines and the other meridians are increasingly... Sinusoidal projection - … This tool converts coordinates from one datum to another datum. Coordinate conversion is composed of a number of different types of conversion: format change of geographic coordinates, conversion of coordinate systems, or transformation to different … Why does adding one character to my MySQL password lock me out? Select the data layer (s) you wish to use and the new file will be in the sinusoidal projection. That page provides the following description: In the sinusoidal projection, areas on the data grids are proportional to the same areas on the Earth, and distances are correct along all parallels and the central meridian. Finally, if you have ArcGIS 9.2 or later, you can use ArcGIS's own batch processing capability. You can then save your re-projected raster, load it into R and keep going from there.. Each tile consists of a 1200 km by 1200 km data array, which corresponds to 2400 by 2400 cells at 500 m resolution. Some comments in the ​ESRI forum thread indicate that the goal of this exercise was to create a "null transformation" and rely on ArcGIS's capability of automatically translating coordinates between ellipsoids and spheres. My understanding is, at the time of this writing, MODIS data is at Version 5 (V5) and using a Sinusoidal Grid projection. Now we can populate all of the mandatory fields of the tool, along with the NODATA Value, which we looked up in the Layers tab above. If you find anything out about this specific dataset, please contact me so I can update this description. In this example, we will make a map using the GSHHS full resolution shoreline, which is in the WGS 1984 geographic coordinate system. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. If you use one of these rounded-off values, your grid may appear to have a geolocation error. Visit the Trac open source project athttp://trac.edgewall.org/, MOD11A1.A2006034.h17v03.005.2008074151903.hdf, MOD11A1.A2008006.h16v07.005.2008007232041.hdf, MOD11A1.A2008004.h12v04.005.2008006021326.hdf, MOD11A1.A2008018.h13v13.005.2008019174742.hdf, MOD11A1.A2008004.h28v12.005.2008006022646.hdf, Find HDFs and Convert SDS to ArcGIS Rasters, Convert SDS in HDFs Listed in Table To ArcGIS Rasters. The area of any region is true. I use the following code, where I'm loading first the convert tiff file (and found TIFF fill for the specific year, here 2000). I am trying to convert a global map from sinusoidal to wgs84. Converting these data to ArcGIS-compatible formats can be tricky. I do know that the forum thread's suggestion of using GEOCENTRIC_TRANSLATION and leaving the parameters set to zero, rather than using LONGITUDE_ROTATION (which has no parameters), does not seem to work. At the time of this writing, MGET was not included in that list yet it can be use to convert the data. // Some projection that is suitable for your area of interest. Could receiving a URL link, not clicking on it, ever pose a security problem? Other methods, such as NADCON and NTv2, use a grid of differences and convert … In this tool, you must provide a table with two fields: one for the input HDF and one for the output raster. Faster if you have mutlpile rasters to convert, and faster than raster package. This tool allows you to search a directory tree and select files using a wildcard. These and many other products can be obtained through NASA's ​Warehouse Inventory Search Tool (WIST). Sign up to join this community. It depicts a hemisphere of … In the UK, can a landlord/agent add new tenants to a joint tenancy agreement without the consent of the current tenants? Meridians are represented by sinusoidal curves except for the central meridian, and parallels are represented by straight lines. The north-south scale is the same everywhere at the central meridian, and the east-west scale is throughout the map the same as that; correspondingly, on the map, as in reality, the length of each parallel is proportional to the cosine of the latitude; thus the shape of the map … This tool can convert a dataset from a spherical coordinate system with angular units (such as Geographic) to a planar coordinate system with linear units. It is typically stated that this projection is area-preserving, meaning that while shapes and angles may be distorted, the ratio of the area of any region calculated in the projected coordinates to the area measured on the surface of the globe … Below, we show how to use MGET's HDF conversion tools to convert land surface temperature (LST) data from LP DAAC's ​MODIS/Terra Land Surface Temperature & Emissivity Daily L3 Global 1km dataset (MOD11A1) to ArcInfo Binary Grid format. The level of zoom is different in each image. Sign up to join this community. We can assume this because only one radius is provided, 6371007.181000 m. This value appears to be the ​authalic radius for WGS 84; if you compute the authalic radius using the a and b parameters for WGS 84, you get this value. in the Africa and Patagonia image). This tile is horizontal number 17, vertical number 3. Starting with Version 4, data providers began using a "Sinusoidal Grid" projection. To a normal ellipsoid/WGS84 one that is compatible with other datasets I'm analyzing. I tried with only one year, and when it works (after restarting R session after loading the raster for example) I have a similar issue to this person, where I have only data in the "northern" hemisphere : Converting sinusoidal to WGS - MODIS TIFF file too big with R, https://stackoverflow.com/questions/36772341/reading-hdf-files-into-r-and-converting-them-to-geotiff-rasters, https://lpdaac.usgs.gov/products/mod17a3hgfv006/, Sequencing your DNA with a USB dongle and open source code, Podcast 310: Fix-Server, and other useful command line utilities, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues, Layers in QGIS that Should Align Don't (but do in FME), QGIS 3.10 not recognising projection information from raster created using GDAL, QGIS 3.12 issues unknown CRS on vector shapefile layer, Etiquette for replying to eager HR acting as intermediary. Now, under Post-conversion processing, we need to fill in Define coordinate system with a custom sinusoidal projection based on the MODIS 6371007.181 m sphere: After filling this in as shown, click Finish, Finish, OK to get back to the Convert SDS in HDF to ArcGIS Raster tool. The SDS name is available in the HDF file header (see the main HDF example for how to extract and interpret this) but it is also available on LP DAAC's ​web page for this dataset, under the Layers tab, along with other useful information: We can calculate the X and Y coordinates of the lower left corner of the tile using the formulas I listed above. This toolset contains tools to convert geographic data from one map projection to another. I've read this solution , and this , and this , and others. Several coordinate conversion tools already exist, however, here is what makes the strength of TWCC: This tool is intuitive and easy to use. The central meridian and parallels are straight lines of true scale (Pearson 1990). In geodesy, conversion among different geographic coordinate systems is made necessary by the different geographic coordinate systems in use across the world and over time. In others, it appears that the image is shifted relative to the shoreline by a cell or two (e.g. construct a .DBF table with Microsoft Excel, construct a .CSV file with a text editor, etc.). You can view and edit the … Define sinusoidal projection. Next, we specify the name of the Scientific Data Set (SDS) contained in the HDF that represents the grid that we want to extract. Many MODIS data products are organized in a tile grid based on a sinusoidal projection. In some cases, it appears that land extends beyond the shoreline (e.g. Examples of pseudocylindrical projections include: Sinusoidal, which was the first pseudocylindrical projection developed. The default expression: os.path.join(outputWorkspace, os.path.dirname(inputFile[len(directoryToSearch)+1:]), os.path.basename(inputFile).split(u'.')[0][:13]). In this case we use the gshhs_f.shp that we created previously. When you obtain GIS data, it often needs to be transformed or projected. To learn more, see our tips on writing great answers. We can do some math on the values of NSIDC's Table 2: Tile width or height = earth width / 36 = (20015109.354 + 20015109.354) / 36 = 1111950.5196666666 m, Cell size = tile width / cells = 1111950.5196666666 / 2400 = 463.31271652777775 m, X coordinate of tile lower-left corner = -20015109.354 + horizontal tile number * tile width, Y coordinate of tile lower-left corner = -10007554.677 + (17 - vertical tile number) * tile height. Hello! The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. It only takes a minute to sign up. All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data. By Edgewall Software. refvecToGeoRasterReference — Convert a referencing vector to a geographic raster reference object. Since there is no perfect way to transpose a curved surface to a flat surface without some … This is the python source. Add ribbon of most used commands-How it could be implemented? If you have not converted HDFs with MGET before, you may want to review that example before proceeding. If you have 9.1, you can probably use the second method below. I finally use mosaic_rasters, to combine all the different TIFF files together. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. Projection Wizard is a web application that helps cartographers select an appropriate projection for their map. In this case, we will choose LST_Night_1km, which is the nighttime land surface temperature. It is a particular set of transverse Mercator projections (map projections) used in narrow zones in … Once you have determined the parameters needed to convert one tile, you can easily convert a batch of tiles using these values. A difference of a meter or two per cell may not seem like much, but for a 1200x1200 grid, that adds up to one or two cells of cumulative error. The second component of the HDF name, which contains the date of the image, may be more unique, resulting in names like A2006034. White Manna Pan, Tamil Mokkai Kelvi, Cake Home Delivery In Kannur, Room Thermostat Installation, Shophouse For Rent Bangkok, " /> "Projections"->"Warp (Reproject)". The tool performs three things as part of this process: It unprojects the data into geographic coordinates (latitude and longitude). Also called Babinet, elliptical, homolographic, or homalographic, Carl B. Mollweide created this pseudo cylindrical projection in 1805. rev 2021.2.5.38499, The best answers are voted up and rise to the top, Geographic Information Systems Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. For Custom Geographic Transformation, select LONGITUDE_ROTATION. Projecting data. Finally, the data are neither conformal, perspective, nor equidistant (USGS 2000). The black is the shoreline produced with LONGITUDE_ROTATION, the red is it produced with GEOCENTRIC_TRANSLATION. Prerequisite Skills This booklet assumes that you have completed the … It is hard to find information on this projection. For this parameter, you must provide a Python expression that can calculate the name of an output raster given the input HDF name. I have never seen ESRI documentation on the various transformation methods. I suspect it is some group at NASA Goddard Space Flight Center (GSFC). It could be that the projection procedure used by ESRI is different than that used by the MODIS data provider. If an elliptically-shaped aerofoil gives the optimum lift distribution, why aren't propeller blades designed around this ideal? Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the projection over the oceans and by … The Mercator projection (/ m ər ˈ k eɪ t ər /) is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. First, open the Create Custom Geographic Transformation and fill in the four inputs as follows: The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. Please edit your question and show us what went wrong. In this case we use the gshhs_f.shp that we created previously. The output in ArcMap looks like this. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Home Questions Tags Users Unanswered Converting sinusoidal to … This article is about converting the GK (Gauss-Krüger) coordinates into WGS 84 (Latitude/Longitude) Background: In cartography, the term Gauss–Krüger Geographic coordinate system is named after Carl Friedrich Gauss (1777-1855) and Johann Heinrich Louis Krüger. This makes ArcMap pretty slow. It takes a lot of times, and R crash (I obtain a message R session aborted). I coded the image so that the value 3 was blue and all other values were green. MGET includes two batch-conversion tools. According to the ​LP DAAC page, the value 3 (binary 11) indicates that the "LST [was] not produced primarily due to reasons other than cloud". In order to … The best I have found is an ​NSIDC web page that describes their MODIS/Terra Snow Cover Daily L3 Global 500m Grid, Version 5 product. Just taking a shot here.. New England). When snow falls, temperature rises. Asking for help, clarification, or responding to other answers. We obtained the GSHHS shoreline by downloading the GSHHS 2.0 shapefiles available on the ​GSHHS website. sinusoidal projection n. An equal-area map projection in which parallels and the prime meridian are straight lines and the other meridians are increasingly... Sinusoidal projection - … This tool converts coordinates from one datum to another datum. Coordinate conversion is composed of a number of different types of conversion: format change of geographic coordinates, conversion of coordinate systems, or transformation to different … Why does adding one character to my MySQL password lock me out? Select the data layer (s) you wish to use and the new file will be in the sinusoidal projection. That page provides the following description: In the sinusoidal projection, areas on the data grids are proportional to the same areas on the Earth, and distances are correct along all parallels and the central meridian. Finally, if you have ArcGIS 9.2 or later, you can use ArcGIS's own batch processing capability. You can then save your re-projected raster, load it into R and keep going from there.. Each tile consists of a 1200 km by 1200 km data array, which corresponds to 2400 by 2400 cells at 500 m resolution. Some comments in the ​ESRI forum thread indicate that the goal of this exercise was to create a "null transformation" and rely on ArcGIS's capability of automatically translating coordinates between ellipsoids and spheres. My understanding is, at the time of this writing, MODIS data is at Version 5 (V5) and using a Sinusoidal Grid projection. Now we can populate all of the mandatory fields of the tool, along with the NODATA Value, which we looked up in the Layers tab above. If you find anything out about this specific dataset, please contact me so I can update this description. In this example, we will make a map using the GSHHS full resolution shoreline, which is in the WGS 1984 geographic coordinate system. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. If you use one of these rounded-off values, your grid may appear to have a geolocation error. Visit the Trac open source project athttp://trac.edgewall.org/, MOD11A1.A2006034.h17v03.005.2008074151903.hdf, MOD11A1.A2008006.h16v07.005.2008007232041.hdf, MOD11A1.A2008004.h12v04.005.2008006021326.hdf, MOD11A1.A2008018.h13v13.005.2008019174742.hdf, MOD11A1.A2008004.h28v12.005.2008006022646.hdf, Find HDFs and Convert SDS to ArcGIS Rasters, Convert SDS in HDFs Listed in Table To ArcGIS Rasters. The area of any region is true. I use the following code, where I'm loading first the convert tiff file (and found TIFF fill for the specific year, here 2000). I am trying to convert a global map from sinusoidal to wgs84. Converting these data to ArcGIS-compatible formats can be tricky. I do know that the forum thread's suggestion of using GEOCENTRIC_TRANSLATION and leaving the parameters set to zero, rather than using LONGITUDE_ROTATION (which has no parameters), does not seem to work. At the time of this writing, MGET was not included in that list yet it can be use to convert the data. // Some projection that is suitable for your area of interest. Could receiving a URL link, not clicking on it, ever pose a security problem? Other methods, such as NADCON and NTv2, use a grid of differences and convert … In this tool, you must provide a table with two fields: one for the input HDF and one for the output raster. Faster if you have mutlpile rasters to convert, and faster than raster package. This tool allows you to search a directory tree and select files using a wildcard. These and many other products can be obtained through NASA's ​Warehouse Inventory Search Tool (WIST). Sign up to join this community. It depicts a hemisphere of … In the UK, can a landlord/agent add new tenants to a joint tenancy agreement without the consent of the current tenants? Meridians are represented by sinusoidal curves except for the central meridian, and parallels are represented by straight lines. The north-south scale is the same everywhere at the central meridian, and the east-west scale is throughout the map the same as that; correspondingly, on the map, as in reality, the length of each parallel is proportional to the cosine of the latitude; thus the shape of the map … This tool can convert a dataset from a spherical coordinate system with angular units (such as Geographic) to a planar coordinate system with linear units. It is typically stated that this projection is area-preserving, meaning that while shapes and angles may be distorted, the ratio of the area of any region calculated in the projected coordinates to the area measured on the surface of the globe … Below, we show how to use MGET's HDF conversion tools to convert land surface temperature (LST) data from LP DAAC's ​MODIS/Terra Land Surface Temperature & Emissivity Daily L3 Global 1km dataset (MOD11A1) to ArcInfo Binary Grid format. The level of zoom is different in each image. Sign up to join this community. We can assume this because only one radius is provided, 6371007.181000 m. This value appears to be the ​authalic radius for WGS 84; if you compute the authalic radius using the a and b parameters for WGS 84, you get this value. in the Africa and Patagonia image). This tile is horizontal number 17, vertical number 3. Starting with Version 4, data providers began using a "Sinusoidal Grid" projection. To a normal ellipsoid/WGS84 one that is compatible with other datasets I'm analyzing. I tried with only one year, and when it works (after restarting R session after loading the raster for example) I have a similar issue to this person, where I have only data in the "northern" hemisphere : Converting sinusoidal to WGS - MODIS TIFF file too big with R, https://stackoverflow.com/questions/36772341/reading-hdf-files-into-r-and-converting-them-to-geotiff-rasters, https://lpdaac.usgs.gov/products/mod17a3hgfv006/, Sequencing your DNA with a USB dongle and open source code, Podcast 310: Fix-Server, and other useful command line utilities, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues, Layers in QGIS that Should Align Don't (but do in FME), QGIS 3.10 not recognising projection information from raster created using GDAL, QGIS 3.12 issues unknown CRS on vector shapefile layer, Etiquette for replying to eager HR acting as intermediary. Now, under Post-conversion processing, we need to fill in Define coordinate system with a custom sinusoidal projection based on the MODIS 6371007.181 m sphere: After filling this in as shown, click Finish, Finish, OK to get back to the Convert SDS in HDF to ArcGIS Raster tool. The SDS name is available in the HDF file header (see the main HDF example for how to extract and interpret this) but it is also available on LP DAAC's ​web page for this dataset, under the Layers tab, along with other useful information: We can calculate the X and Y coordinates of the lower left corner of the tile using the formulas I listed above. This toolset contains tools to convert geographic data from one map projection to another. I've read this solution , and this , and this , and others. Several coordinate conversion tools already exist, however, here is what makes the strength of TWCC: This tool is intuitive and easy to use. The central meridian and parallels are straight lines of true scale (Pearson 1990). In geodesy, conversion among different geographic coordinate systems is made necessary by the different geographic coordinate systems in use across the world and over time. In others, it appears that the image is shifted relative to the shoreline by a cell or two (e.g. construct a .DBF table with Microsoft Excel, construct a .CSV file with a text editor, etc.). You can view and edit the … Define sinusoidal projection. Next, we specify the name of the Scientific Data Set (SDS) contained in the HDF that represents the grid that we want to extract. Many MODIS data products are organized in a tile grid based on a sinusoidal projection. In some cases, it appears that land extends beyond the shoreline (e.g. Examples of pseudocylindrical projections include: Sinusoidal, which was the first pseudocylindrical projection developed. The default expression: os.path.join(outputWorkspace, os.path.dirname(inputFile[len(directoryToSearch)+1:]), os.path.basename(inputFile).split(u'.')[0][:13]). In this case we use the gshhs_f.shp that we created previously. When you obtain GIS data, it often needs to be transformed or projected. To learn more, see our tips on writing great answers. We can do some math on the values of NSIDC's Table 2: Tile width or height = earth width / 36 = (20015109.354 + 20015109.354) / 36 = 1111950.5196666666 m, Cell size = tile width / cells = 1111950.5196666666 / 2400 = 463.31271652777775 m, X coordinate of tile lower-left corner = -20015109.354 + horizontal tile number * tile width, Y coordinate of tile lower-left corner = -10007554.677 + (17 - vertical tile number) * tile height. Hello! The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. It only takes a minute to sign up. All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data. By Edgewall Software. refvecToGeoRasterReference — Convert a referencing vector to a geographic raster reference object. Since there is no perfect way to transpose a curved surface to a flat surface without some … This is the python source. Add ribbon of most used commands-How it could be implemented? If you have not converted HDFs with MGET before, you may want to review that example before proceeding. If you have 9.1, you can probably use the second method below. I finally use mosaic_rasters, to combine all the different TIFF files together. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. Projection Wizard is a web application that helps cartographers select an appropriate projection for their map. In this case, we will choose LST_Night_1km, which is the nighttime land surface temperature. It is a particular set of transverse Mercator projections (map projections) used in narrow zones in … Once you have determined the parameters needed to convert one tile, you can easily convert a batch of tiles using these values. A difference of a meter or two per cell may not seem like much, but for a 1200x1200 grid, that adds up to one or two cells of cumulative error. The second component of the HDF name, which contains the date of the image, may be more unique, resulting in names like A2006034. White Manna Pan, Tamil Mokkai Kelvi, Cake Home Delivery In Kannur, Room Thermostat Installation, Shophouse For Rent Bangkok, " />

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Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Home Questions Tags Users Unanswered convert sinusoidal to … This is a note to let the editors of this article know that File: Sinusoidal projection SW.jpg will be appearing as picture of the day on March 22, 2015. From that thread and some experimentation, I know of two methods. The original raster is here: > ras_sinu class : RasterLayer dimensions : 33600, 86400, 2903040000 (nrow, ncol, ncell) resolution : 463.3127, 463.3127 (x, y) extent : -20015109, 20015109, -6671703, 8895604 (xmin, xmax, ymin, ymax) coord. Is it unethical to accidentally benefit from online material in a take-home exam? Collignon projection, … Making statements based on opinion; back them up with references or personal experience. Shapes are increasingly distorted away from the central meridian and near the poles. To get this component, you can modify the default expression to this: os.path.join(outputWorkspace, os.path.dirname(inputFile[len(directoryToSearch)+1:]), os.path.basename(inputFile).split(u'.')[1][:13]). Like the stereographic projection and gnomonic projection, orthographic projection is a perspective (or azimuthal) projection, in which the sphere is projected onto a tangent plane or secant plane. var proj = ee.Projection(...); var output = collection.reduce(...).reproject(proj); A few cases that require a fixed projection include: Computing gradients (e.g. But I am not an expert in datums and projections, so I am hesitant to conclude anything here. When I tried this, the shoreline was not aligned with the MODIS data, as show below. The following image shows tile locations for MOD10A1 V005 data in a sinusoidal projection. This example only applies to data in that projection. But the distance 1200 km and 500 km are really just rough approximations. I've found a source code in python and tried to port it into C#. I do not know which organization defines the versions and projections. The crux of this problem is understanding the MODIS sinusoidal projection and representing it properly in ArcGIS. I've converted HDF file to TIFF with R and gdalUtils. Projections. I have only tested with 9.3.1. Note that NoData values are set to gray. The MODIS land products are produced at 4 resolutions (250m, 500m, 1km, and 0.05 degree), and in 3 projections (Sinusoidal, Lambert Azimuthal Equal-Area, and Geographic). As you can see, the land mask lines roughly with the GSHHS shoreline, but not exactly. Basically, we wanted ArcGIS to perform that translation but not do anything else, like a datum shift. Then I created an empty raster with world extent and define a projection. It may be the last option available, and you may have to scroll down to see it. From here. 3. First, we open MGET's Convert SDS in HDF to ArcGIS Raster tool, choose the HDF to convert and, specify an output raster. Pseudo cylindrical equal-area projection. These providers include the ​USGS/NASA Land Processes Distributed Active Archive Center (LP DAAC), which provides a ​variety of terrestrial data such as land surface temperature (LST) and vegetation indices, and the ​National Snow and Ice Data Center (NSIDC), which provides ​snow cover data and related products. Geographic coordinates converter. I use five files in this example: This example resembles the main MGET HDF conversion example. Some providers of MODIS data distribute HDFs containing Level 3 grids in sinusoidal projections. We refer to these switching methods as projection on the fly and geographic transformations. What does "it did not work well" mean? You can find an online calculator here, that will convert from tiles to latitude and longitude coordinates.This tutorial will demonstrate how to perform this conversion in Python. Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Learn about equation-based transformation methods. A projection is the means by which you display the coordinate system and your data on a flat surface, such as a piece of paper or a digital screen. Did you get some errors? You can populate the table however you like (e.g. How does a copper water pipe disintegrate? The sinusoidal projection is a pseudocylindrical equal-area map projection. sinusoidal projection synonyms, sinusoidal projection pronunciation, sinusoidal projection translation, English dictionary definition of sinusoidal projection. But yes, that is a very large raster. This method uses an ArcGIS geoprocessing tool called Create Custom Geographic Transformation, which exists in ArcGIS 9.2 and later. What's to stop the House majority party from voting to expel every member of the House minority party from committees? : +proj=sinu +lon_0=0 … According to various websites, MODIS data providers used an "Integerized Sinusoidal Grid" projection up through Version 3 (V3) of MODIS data. So my advice would be to try to open your raster in QGIS and use "Raster"->"Projections"->"Warp (Reproject)". The tool performs three things as part of this process: It unprojects the data into geographic coordinates (latitude and longitude). Also called Babinet, elliptical, homolographic, or homalographic, Carl B. Mollweide created this pseudo cylindrical projection in 1805. rev 2021.2.5.38499, The best answers are voted up and rise to the top, Geographic Information Systems Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. For Custom Geographic Transformation, select LONGITUDE_ROTATION. Projecting data. Finally, the data are neither conformal, perspective, nor equidistant (USGS 2000). The black is the shoreline produced with LONGITUDE_ROTATION, the red is it produced with GEOCENTRIC_TRANSLATION. Prerequisite Skills This booklet assumes that you have completed the … It is hard to find information on this projection. For this parameter, you must provide a Python expression that can calculate the name of an output raster given the input HDF name. I have never seen ESRI documentation on the various transformation methods. I suspect it is some group at NASA Goddard Space Flight Center (GSFC). It could be that the projection procedure used by ESRI is different than that used by the MODIS data provider. If an elliptically-shaped aerofoil gives the optimum lift distribution, why aren't propeller blades designed around this ideal? Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the projection over the oceans and by … The Mercator projection (/ m ər ˈ k eɪ t ər /) is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. First, open the Create Custom Geographic Transformation and fill in the four inputs as follows: The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. Please edit your question and show us what went wrong. In this case we use the gshhs_f.shp that we created previously. The output in ArcMap looks like this. Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Home Questions Tags Users Unanswered Converting sinusoidal to … This article is about converting the GK (Gauss-Krüger) coordinates into WGS 84 (Latitude/Longitude) Background: In cartography, the term Gauss–Krüger Geographic coordinate system is named after Carl Friedrich Gauss (1777-1855) and Johann Heinrich Louis Krüger. This makes ArcMap pretty slow. It takes a lot of times, and R crash (I obtain a message R session aborted). I coded the image so that the value 3 was blue and all other values were green. MGET includes two batch-conversion tools. According to the ​LP DAAC page, the value 3 (binary 11) indicates that the "LST [was] not produced primarily due to reasons other than cloud". In order to … The best I have found is an ​NSIDC web page that describes their MODIS/Terra Snow Cover Daily L3 Global 500m Grid, Version 5 product. Just taking a shot here.. New England). When snow falls, temperature rises. Asking for help, clarification, or responding to other answers. We obtained the GSHHS shoreline by downloading the GSHHS 2.0 shapefiles available on the ​GSHHS website. sinusoidal projection n. An equal-area map projection in which parallels and the prime meridian are straight lines and the other meridians are increasingly... Sinusoidal projection - … This tool converts coordinates from one datum to another datum. Coordinate conversion is composed of a number of different types of conversion: format change of geographic coordinates, conversion of coordinate systems, or transformation to different … Why does adding one character to my MySQL password lock me out? Select the data layer (s) you wish to use and the new file will be in the sinusoidal projection. That page provides the following description: In the sinusoidal projection, areas on the data grids are proportional to the same areas on the Earth, and distances are correct along all parallels and the central meridian. Finally, if you have ArcGIS 9.2 or later, you can use ArcGIS's own batch processing capability. You can then save your re-projected raster, load it into R and keep going from there.. Each tile consists of a 1200 km by 1200 km data array, which corresponds to 2400 by 2400 cells at 500 m resolution. Some comments in the ​ESRI forum thread indicate that the goal of this exercise was to create a "null transformation" and rely on ArcGIS's capability of automatically translating coordinates between ellipsoids and spheres. My understanding is, at the time of this writing, MODIS data is at Version 5 (V5) and using a Sinusoidal Grid projection. Now we can populate all of the mandatory fields of the tool, along with the NODATA Value, which we looked up in the Layers tab above. If you find anything out about this specific dataset, please contact me so I can update this description. In this example, we will make a map using the GSHHS full resolution shoreline, which is in the WGS 1984 geographic coordinate system. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. If you use one of these rounded-off values, your grid may appear to have a geolocation error. Visit the Trac open source project athttp://trac.edgewall.org/, MOD11A1.A2006034.h17v03.005.2008074151903.hdf, MOD11A1.A2008006.h16v07.005.2008007232041.hdf, MOD11A1.A2008004.h12v04.005.2008006021326.hdf, MOD11A1.A2008018.h13v13.005.2008019174742.hdf, MOD11A1.A2008004.h28v12.005.2008006022646.hdf, Find HDFs and Convert SDS to ArcGIS Rasters, Convert SDS in HDFs Listed in Table To ArcGIS Rasters. The area of any region is true. I use the following code, where I'm loading first the convert tiff file (and found TIFF fill for the specific year, here 2000). I am trying to convert a global map from sinusoidal to wgs84. Converting these data to ArcGIS-compatible formats can be tricky. I do know that the forum thread's suggestion of using GEOCENTRIC_TRANSLATION and leaving the parameters set to zero, rather than using LONGITUDE_ROTATION (which has no parameters), does not seem to work. At the time of this writing, MGET was not included in that list yet it can be use to convert the data. // Some projection that is suitable for your area of interest. Could receiving a URL link, not clicking on it, ever pose a security problem? Other methods, such as NADCON and NTv2, use a grid of differences and convert … In this tool, you must provide a table with two fields: one for the input HDF and one for the output raster. Faster if you have mutlpile rasters to convert, and faster than raster package. This tool allows you to search a directory tree and select files using a wildcard. These and many other products can be obtained through NASA's ​Warehouse Inventory Search Tool (WIST). Sign up to join this community. It depicts a hemisphere of … In the UK, can a landlord/agent add new tenants to a joint tenancy agreement without the consent of the current tenants? Meridians are represented by sinusoidal curves except for the central meridian, and parallels are represented by straight lines. The north-south scale is the same everywhere at the central meridian, and the east-west scale is throughout the map the same as that; correspondingly, on the map, as in reality, the length of each parallel is proportional to the cosine of the latitude; thus the shape of the map … This tool can convert a dataset from a spherical coordinate system with angular units (such as Geographic) to a planar coordinate system with linear units. It is typically stated that this projection is area-preserving, meaning that while shapes and angles may be distorted, the ratio of the area of any region calculated in the projected coordinates to the area measured on the surface of the globe … Below, we show how to use MGET's HDF conversion tools to convert land surface temperature (LST) data from LP DAAC's ​MODIS/Terra Land Surface Temperature & Emissivity Daily L3 Global 1km dataset (MOD11A1) to ArcInfo Binary Grid format. The level of zoom is different in each image. Sign up to join this community. We can assume this because only one radius is provided, 6371007.181000 m. This value appears to be the ​authalic radius for WGS 84; if you compute the authalic radius using the a and b parameters for WGS 84, you get this value. in the Africa and Patagonia image). This tile is horizontal number 17, vertical number 3. Starting with Version 4, data providers began using a "Sinusoidal Grid" projection. To a normal ellipsoid/WGS84 one that is compatible with other datasets I'm analyzing. I tried with only one year, and when it works (after restarting R session after loading the raster for example) I have a similar issue to this person, where I have only data in the "northern" hemisphere : Converting sinusoidal to WGS - MODIS TIFF file too big with R, https://stackoverflow.com/questions/36772341/reading-hdf-files-into-r-and-converting-them-to-geotiff-rasters, https://lpdaac.usgs.gov/products/mod17a3hgfv006/, Sequencing your DNA with a USB dongle and open source code, Podcast 310: Fix-Server, and other useful command line utilities, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues, Layers in QGIS that Should Align Don't (but do in FME), QGIS 3.10 not recognising projection information from raster created using GDAL, QGIS 3.12 issues unknown CRS on vector shapefile layer, Etiquette for replying to eager HR acting as intermediary. Now, under Post-conversion processing, we need to fill in Define coordinate system with a custom sinusoidal projection based on the MODIS 6371007.181 m sphere: After filling this in as shown, click Finish, Finish, OK to get back to the Convert SDS in HDF to ArcGIS Raster tool. The SDS name is available in the HDF file header (see the main HDF example for how to extract and interpret this) but it is also available on LP DAAC's ​web page for this dataset, under the Layers tab, along with other useful information: We can calculate the X and Y coordinates of the lower left corner of the tile using the formulas I listed above. This toolset contains tools to convert geographic data from one map projection to another. I've read this solution , and this , and this , and others. Several coordinate conversion tools already exist, however, here is what makes the strength of TWCC: This tool is intuitive and easy to use. The central meridian and parallels are straight lines of true scale (Pearson 1990). In geodesy, conversion among different geographic coordinate systems is made necessary by the different geographic coordinate systems in use across the world and over time. In others, it appears that the image is shifted relative to the shoreline by a cell or two (e.g. construct a .DBF table with Microsoft Excel, construct a .CSV file with a text editor, etc.). You can view and edit the … Define sinusoidal projection. Next, we specify the name of the Scientific Data Set (SDS) contained in the HDF that represents the grid that we want to extract. Many MODIS data products are organized in a tile grid based on a sinusoidal projection. In some cases, it appears that land extends beyond the shoreline (e.g. Examples of pseudocylindrical projections include: Sinusoidal, which was the first pseudocylindrical projection developed. The default expression: os.path.join(outputWorkspace, os.path.dirname(inputFile[len(directoryToSearch)+1:]), os.path.basename(inputFile).split(u'.')[0][:13]). In this case we use the gshhs_f.shp that we created previously. When you obtain GIS data, it often needs to be transformed or projected. To learn more, see our tips on writing great answers. We can do some math on the values of NSIDC's Table 2: Tile width or height = earth width / 36 = (20015109.354 + 20015109.354) / 36 = 1111950.5196666666 m, Cell size = tile width / cells = 1111950.5196666666 / 2400 = 463.31271652777775 m, X coordinate of tile lower-left corner = -20015109.354 + horizontal tile number * tile width, Y coordinate of tile lower-left corner = -10007554.677 + (17 - vertical tile number) * tile height. Hello! The filled-in tool should look like this: Now we want to project the WGS 84 geographic data to the MODIS sinusoidal projection. It only takes a minute to sign up. All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data. By Edgewall Software. refvecToGeoRasterReference — Convert a referencing vector to a geographic raster reference object. Since there is no perfect way to transpose a curved surface to a flat surface without some … This is the python source. Add ribbon of most used commands-How it could be implemented? If you have not converted HDFs with MGET before, you may want to review that example before proceeding. If you have 9.1, you can probably use the second method below. I finally use mosaic_rasters, to combine all the different TIFF files together. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. Projection Wizard is a web application that helps cartographers select an appropriate projection for their map. In this case, we will choose LST_Night_1km, which is the nighttime land surface temperature. It is a particular set of transverse Mercator projections (map projections) used in narrow zones in … Once you have determined the parameters needed to convert one tile, you can easily convert a batch of tiles using these values. A difference of a meter or two per cell may not seem like much, but for a 1200x1200 grid, that adds up to one or two cells of cumulative error. The second component of the HDF name, which contains the date of the image, may be more unique, resulting in names like A2006034.

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