[GRASS-user] gdal_translate

[Micha Silver]

On 06/06/2010 01:52 PM, Sandile Gumede wrote:
> Hi
>
> I've got these coordinates
> upper-right-corner: 33 degrees, 40 minutes, 31.28 seconds S
>                            18 degrees, 17 minutes, 32.52 seconds E
>
>
>  lower-left-corner: 33 degrees, 40 minutes, 31.28 seconds S
>                           18 degrees, 38 minutes, 55.37 seconds E
>
> I want to clip a portion of Cape Flats using these coordinates from a 
> GeoTiff that covers the whole South Africa. I tried to convert these 
> coordinates into decimal degrees but when I'm trying to run   
> gdal_translate -projwin -33.67536 18.29237 -33.94925 18.64871 
> srtmgdem.tif cape_flats.tif its giving me an error message:
>
> Input file size is 36001 , 24001
> Computed -srcwin -52409 -39950 -328 -427 from projected window.
> Computed -srcwin falls outside raster size of 36001X24001
>
Perhaps you have the coordinates above in the wrong order? It should be:
-projwin <Upper Left X> <Upper Left Y> <Lower Right X> <Lower Right Y>
so for Cape town you probably want
-projwin 18.29237  -33.67536  18.64871  -33.94925

Running 'gdalinfo srtmgdem.tif' will give you the bounding box (Upper 
Left, Lower Right, etc) of the original. This way you can see if you've 
chosen an area within the original.

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-- 
Micha Silver
http://www.surfaces.co.il/
Arava Development Co.  +972-52-3665918

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