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Is the GNSS receiver providing NMEA data? If so, is the GSV sentence provided? If so, the elevation in degrees is provided in that specific sentence. http://aprs.gids.nl/nmea/#gsv


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You might consider the Shuttle Radar Topography Mission (SRTM) 30 product, which is a coarse resolution near-global 30-arcsecond DEM. You can download the data at the following FTP site: http://dds.cr.usgs.gov/srtm/version2_1/SRTM30/ There is also the GTOPO30 elevation data set that is commonly used for these applications. EDIT The GTOPO30 dataset has ...


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i worked on SRTMGeoTIFFReader and this is what i give All i want is the coordinate of 4 corner of my geotiff pic like this : Corner Coordinates: Upper Left ( 69.7357061, 29.87658367) Lower Left ( 69.7357061, 28.19226367) Upper Right ( 86.6125061, 29.87658367) Lower Right ( 86.6125061, 28.19226367) Center ( 781741.061, 2903442.367) have you any ...


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if you compute the statistics of your raster, (or with zonal statistics if you look for a specific zone), you can find its maximum value (properties > source > Statistics > max) Then you can use the value in raster calculator Con("raster" == maxvalue, 1) EDIt: where maxvalue is either the raster created by zonal statistics or the value that you read in ...


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Since you appear to use a vector representation of the routes, you may first split it into short segments (in order to later have a representative view on slope etc), using v.split; then add a new column to the attribute table of that road map: "slope double precision" using v.db.addcolumn; eventually upload the respective road segment slopes to the ...


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Since 2013 there is the EU-DEM 25 m: new Digital Surface Model (DSM), representing the first surface as illuminated by the sensors. You can download the GeoTIFF files here: http://www.eea.europa.eu/data-and-maps/data/eu-dem#tab-gis-data In 2014/2015 there will be the release of the worldwide SRTM 30m data as announced here: ...



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