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I am trying to assess the accuracy of multiple classifications using the "Create Accuracy Assessment Points" tool in ArcGIS Pro 2.4.2. I classified each image using 3 different classification algorithms into "leaves", "soil", and "shadows." I have plots like the ones pictured below, to which 500 points were randomly assigned. I then went through and labeled the feature that each point fell on (without looking at the classified image) and labeled the points as either "leaves", "shadows", or "soil."

enter image description here

I should say that the "Create Accuracy Assessment Points" tool picks one of the classified rasters and puts points on the raster, which I then hid from view and used the original RGB image to label my ground-reference points. Therefore, after ground-referencing, you will have two columns in the attributes table: The classified points and the ground-reference points. You can then compute an error matrix to assess the accuracy of your classification. Here's classified raster 1, so that I can more clearly explain what is happening:

enter image description here

Let's say I want to use these same points to label the other classified rasters, so that I don't have to re-label them for a different image. I want my ground-reference labels to carry over to the next raster, while generating a new set of labels for where the points fall on the other rasters. How can I do this?

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Sounds like you want to use the Extract values to points tool? This would transfer a pixel value from your classified raster to the point dataset.

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  • Thank you, that’s what I needed!
    – ihb
    Mar 19, 2020 at 3:16

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