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If I have a raster map of pH, and a point (vector) dataset of map independent pH measurements, then how can I validate the accuracy of the existing raster with these extra measurements?

I don't have something specific in mind that's why I haven't something to attach.

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  • 1st step would be to sample the raster at the independent points and plot them. Commented Sep 8, 2023 at 12:11
  • @user2856 thank you for your answer. Can you explain a bit further?How to sample the raster at the independent points? Commented Sep 8, 2023 at 17:15
  • That depends on the software or programming language/libraries you use. But the search terms "sample raster points your_software_or_library" is a start. Commented Sep 8, 2023 at 21:43
  • @user2856 do you have any specific comment about how to execute it in a GIS or in R? I am thinking about extract raster values to points and calculate statistics metrics such as RMSE, MAE. Commented Sep 10, 2023 at 9:25
  • docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/… Commented Sep 11, 2023 at 10:14

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