[gdal-dev] GDAL Arbitrary Warp Problems

[Homme Zwaagstra]

Hi Michael,

I had to tangle with warping recently and took inspiration from both the warp tutorial and the gdalwarp source.  The result is at <https://github.com/geo-data/cesium-terrain-builder/blob/master/src/GDALTiler.cpp#L202> - it may be of help.

Homme

On 15 July 2014 20:00:50 GMT+01:00, Even Rouault <even.rouault at mines-paris.org> wrote:
>Le mardi 15 juillet 2014 20:52:16, Michael Aschenbeck a écrit :
>> Thanks for your response.
>> 
>> For my application, I will be creating the transformation on the fly.
> It
>> will be a non-standard transformation.  Unless I'm mistaken, I don't
>> believe this can be done with gdalwarp directly.
>> 
>> Also, I am under the assumption that its source code is introduced in
>the
>> tutorial I am working off of (http://www.gdal.org/warptut.html). 
>Yet, this
>> just introduces a standard transformation, not a custom one.  This is
>why
>> I'm having trouble.
>
>When doing custom stuff, you often need to step into GDAL code to
>understand 
>better how things are interacting together.
>Actually looking at your identityTransform and
>GDALSuggestedWarpOutput2(), I 
>think there's at least something you should fix. You should initialize
>all the 
>nPointcount elements of then panSuccess array to 1.
>
>Even
>
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