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

[Gianni Olivieri]

2010/6/11 Gianni Olivieri <gianni.olivieri at gmail.com>:
> 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:

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 <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
>



-- 
Gianni Olivieri
gianni.olivieri at gmail.com