Re: [gdal-dev] elevetions from ASTER GDEM V2
If the spatial resulution is fine for your problem, then as Tyler suggested, you can use gdallocationinfo [1] to get the pixel value at Long,Lat location. If you think you need to downscale your data to your needs, you can first built a vrt (virtual dataset) with gdal's gdalbuildvrt [2] and -tr option. What I don't know is, which method vrts are using to obtain raster values when the source rasters are in another resolution than the vrt [1] http://www.gdal.org/gdallocationinfo.html [2] http://www.gdal.org/gdalbuildvrt.html On Thu, Jan 24, 2013 at 10:15 PM, Tyler Mitchell tyler.mitch...@actian.comwrote: On 2013-01-24, at 11:43 AM, Elias Kotsifis wrote: I want to calculate the elevation of any point on earth, giving lat, Long (for example like google elevation Api, or the earth tools: http://www.earthtools.org/webservices.htm # cheigit) based the ASTER GDEM MODEL V2. I went to download data from there, and gives me geotiff files. Overall for the entire planet is 22,702 granule with 400GB size Then what should I do? Hi Elias, Have you tried the gdallocationinfo command? You can pass it a lat/lon and raster and it will report back what you're after I believe. Hope it helps, Tyler ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] elevetions from ASTER GDEM V2
Hello I want to calculate the elevation of any point on earth, giving lat, Long (for example like google elevation Api, or the earth tools: http://www.earthtools.org/webservices.htm # cheigit) based the ASTER GDEM MODEL V2. I went to download data from there, and gives me geotiff files. Overall for the entire planet is 22,702 granule with 400GB size Then what should I do? Best regards Elias Kotsifis ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] elevetions from ASTER GDEM V2
On 24/01/2013 20:43, Elias Kotsifis wrote: Hello I want to calculate the elevation of any point on earth, giving lat, Long (for example like google elevation Api, or the earth tools: http://www.earthtools.org/webservices.htm # cheigit) based the ASTER GDEM MODEL V2. I went to download data from there, and gives me geotiff files. Overall for the entire planet is 22,702 granule with 400GB size Then what should I do? Hello, Generally, a bilinear or bicubic interpolation is used to compute the elevation of the point. You should read this paper : http://www.geocomputation.org/1999/082/gc_082.htm Jean-Claude ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] elevetions from ASTER GDEM V2
On 2013-01-24, at 11:43 AM, Elias Kotsifis wrote: I want to calculate the elevation of any point on earth, giving lat, Long (for example like google elevation Api, or the earth tools: http://www.earthtools.org/webservices.htm # cheigit) based the ASTER GDEM MODEL V2. I went to download data from there, and gives me geotiff files. Overall for the entire planet is 22,702 granule with 400GB size Then what should I do? Hi Elias, Have you tried the gdallocationinfo command? You can pass it a lat/lon and raster and it will report back what you're after I believe. Hope it helps, Tyler ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
