[gdal-dev] SRTM maps and altitude...

[Gianni Olivieri]

2010/6/11 Matt Klaric <matt at klaric.com>:
> 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 <gianni.olivieri at gmail.com>
> 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
>> gianni.olivieri at gmail.com
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>



-- 
Gianni Olivieri
gianni.olivieri at gmail.com