2010/6/11 Gianni Olivieri <[email protected]>: > 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:
thanks... I've looked to ossim... but there is a versione for linux? or only form mac and windows? >> >> $ 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] > -- Gianni Olivieri [email protected] _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
