[gdal-dev] elevetions from ASTER GDEM V2

[Nick Ves]

If the spatial resulution is fine for your problem, then as Tyler
suggested, you can use gdallocationinfo [1] to get the pixel value at
Long,Lat location.

If you think you need to downscale your data to your needs, you can first
built a vrt (virtual dataset) with gdal's "gdalbuildvrt" [2] and -tr
option.


What I don't know is, which method vrts are using to obtain raster values
when the source rasters are in another resolution than the vrt


[1] http://www.gdal.org/gdallocationinfo.html
[2] http://www.gdal.org/gdalbuildvrt.html




On Thu, Jan 24, 2013 at 10:15 PM, Tyler Mitchell
<tyler.mitchell at actian.com>wrote:

>
> On 2013-01-24, at 11:43 AM, Elias Kotsifis wrote:
>
> I want to calculate the elevation of any point on earth, giving lat, Long
> (for example like google elevation Api, or the earth tools:
> http://www.earthtools.org/webservices.htm # cheigit) based the ASTER GDEM
> MODEL V2.
> I went to download data from there, and gives me geotiff files. Overall
> for the entire planet is 22,702 granule with 400GB size
> Then what should I do?
>
>
> Hi Elias,
> Have you tried the gdallocationinfo command?  You can pass it a lat/lon
> and raster and it will report back what you're after I believe.
>
> Hope it helps,
> Tyler
>
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20130125/bb71f960/attachment.html>