[gdal-dev] Reading interpolated values on DSM

[Michael Sumner]

Or a grouping function that returned the cell index for neighbours and
weighting that are involved in whatever calculation summary is wanted.

Maybe the warper could return this as a starting point rather than doing
the "task at hand". ?



On Wed, Apr 24, 2024 at 8:51 PM Even Rouault via gdal-dev <
gdal-dev at lists.osgeo.org> wrote:

> 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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-- 
Michael Sumner
Software and Database Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
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