2010/6/11 Matt Klaric <[email protected]>: > While you certainly can accomplish this using GDAL, you'll need to first > figure out which hgt file to open, then translate the geographic coordinate > to the image coordinate to know what pixel value to lookup. > > An alternative solution is OSSIM (http://www.ossim.org/). It has a > command-line app called ossim-height. You can use it as follows: > > $ ossim-height 45 10 > Opened cell: /srtm1/N45E010.hgt > MSL to ellipsoid delta: 39.049 > Height above MSL: 37 > Height above ellipsoid: 76.049 > Geoid value: 39.049
thanks for this link, I didn't know this software. I try this. Thanks... > > You can setup a configuration file (see: > http://trac.osgeo.org/ossim/wiki/ossimElevationSetup) that points to your > directory of hgt files and OSSIM will figure out which file is needed for > your query. > > If you're needing to embed this in an application of yours, you can use the > OSSIM API to accomplish the same thing. Check out the source for > ossim-height for an example of how to do this. > > --Matt > > > On Fri, Jun 11, 2010 at 9:33 AM, Gianni Olivieri <[email protected]> > wrote: >> >> Hallo, >> >> I need to extract the altitude of a GPS coordinate from a serie of >> HGT (SRTM or DEM) (I've download the entire Eurasia... >> >> So, for example, If I have a directory with all htg file and I'd like >> to know the altitude of this coords: >> >> 48°01'35.89" N >> 8°23'51,86" E >> >> how can I preceed? >> >> The elevation in that point is: 761m (google earth result) >> I'd like to have a similar results. >> >> Best regards >> >> >> >> -- >> Gianni Olivieri >> [email protected] >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/gdal-dev > > -- Gianni Olivieri [email protected] _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
