Using plgriddata

Dave Partridge — Tue, 18 Nov 2025 10:31:41 -0000

I have some sparse data (FWHM values) which I am sending into plgriddata, in this case using GRID_NNLI, 1.001f. When I look at the values in the data versus the output grid, I see:

FWHM Min: 1.75532 Max: 7.24468
zg Min: 2.64953 zg Max: 3.795

I've tried various nn.... algorithms, but none appear to preserve the actual minima and maxima. Is that to be expected. I had rather hoped that the actual data points that I do have would be (close to) preserved.

Guidance will be much appreciated.

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Using plgriddata