[Gdal-dev] Extracting Geo Info From GeoTiff's

[Frank Warmerdam]

On 10/13/05, Theuns Heydenrych <Theuns at softsim.co.za> wrote:
> I did read through the source code to get a feeling where to start.
> As far as I can figure out , I have to use the function GTIFGetDefn to get a
> definition structure back with the information , but the function obviously
> requires a handle to the Geotiff file.
> This handle can be obtained from using the GTIFNew Function.

Theuns,

You are digging into too low a level.  Normally you would
call GetProjectionRef() on the GDALDataset to get the coordinate
system information (expressed in OGC Well Known Text), and
GetGeoTransform() to get the affine transformation between pixel/line
and georeferenced coordinates.

You aren't supposed to be calling any of the GTIF functions directly.

If you need detailed and exact information about the GeoTIFF as
the original geotiff tags then you should likely be using libgeotiff
directly.

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Such a disclaimer is pretty lame on a public mailing list.  I would
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organization look ... disfunctional.

Best regards,
--
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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