[gdal-dev] Reading interpolated values on DSM

[Even Rouault]

Hi,

I guess this discussion, and past similar ones, calls for an 
enhancement. A new API function, like CPLErr 
GDALRasterInterpolateAtPoint(GDALRasterBandH, double dfPixel, double 
dfLocation, GDALRIOResampleAlg eInterpolation, double *pdfValue), that 
could be used by a new mode of gdallocationinfo. The 
GDALRPCGetDEMHeight() function in alg/gdal_rpc.cpp is a plausible 
candidate implementation for bilinear and bicubic (we could potentially 
restrict to that at the moment).

Even

Le 24/04/2024 à 10:33, Javier Jimenez Shaw via gdal-dev a écrit :
> Hi
>
> I would like to read in QGIS or GDAL an interpolated value in a DSM 
> (well, actually it is a geoid model, but it is the same behaviour). 
> See that I do not want the pixel value, but the linear interpolation 
> among the neighbour pixels, assuming that the pixel value is in the 
> center of the pixel.
> For instance, this file
> https://www.isgeoid.polimi.it/Geoid/Asia/Japan/japan2000_g.html
>
> Is there any way to get it (without implementing the interpolation 
> myself)?
> If I understood correctly gdallocationinfo is not interpolating, just 
> giving the pixel value.
>
> Thanks
>
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