[gdal-dev] Re: Help with setting GCPs in a GeoTiff

[matt.feemster]

Thanks for the help guys. I've managed to figure it out in code.

A quick note though, wouldn't X correspond to lon (increase/decrease
horizontally) and Y correspond to lat (increase/decrease vertically)?

And shouldn't the far pixel count be the extent minus one since it's zero
indexed?

Here is an example of the way I am setting up the upper right corner in
code.

gcpList[1].dfGCPPixel = width - 1;
gcpList[1].dfGCPLine = 0;
gcpList[1].dfGCPX = ur.lng;
gcpList[1].dfGCPY = ur.lat;
gcpList[1].dfGCPZ = ur.hae;

Let me know if this is correct?

Regarding this:

http://www.gdal.org/gdal_datamodel.html

More concrete information and examples there on GCPs would be helpful.

Thanks.


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