[gdal-dev] Spatial Resolution from img file
Kyle Shannon
kyle at pobox.com
Thu Jul 30 07:55:21 PDT 2015
On Thu, Jul 30, 2015 at 5:03 AM, user gdal <userofgdal at gmail.com> wrote:
> Dear friends,
> I have a geo ref. ERDAS img file. How to obtain its spatial resolution
> programmatically (C++)?
>
> One suggestion I received was to refer to gdalinfo.c However I couldn't get
> the required information in gdalinfo.c. I also felt it to be unclear. What I
> have seen in gdalinfo is how to get columns, rows etc. (for which we needn't
> visit the gdalinfo program).
It's in there, the program prints out:
...
Pixel Sizes = (dx,-dy)
...
So it has to have the code.
>
> I expected something like GetXResolution(..) and GetYResolution(...) kind of
> situation. But...
The information you are looking for is contained in the geotranform
matrix available through
GDALGetGeoTransform(GDALDatasetH, double*);
See the api tutorial for more information:
http://gdal.org/gdal_tutorial.html
>
> Any help, please!
>
> With thanks,
>
> Yours sincerely,
>
> B. Ramesh
>
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--
Kyle
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