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I have applied NDWI (Normalized Difference Water Index) on years: 2018, 2019 and 2020 to extract the water bodies. Then I used MCD12Q1.061 MODIS Land Cover Type Yearly Global 500m product for the year 2017 only (as a ground truth) and extracted only the water bodies class.

Goal: Now, I want to see the accuracy of NDWI by taking MCD12Q1.061 MODIS Land Cover Type Yearly Global 500m as a ground truth.

My question is, is it possible? If it is, can someone please tell the pipeline/solution?

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  • I wouldn't recommend using that product as ground truth. There are several databases of water bodies to compare. Is the goal identify reservoirs? If so, check this: github.com/global-water-watch/research-reservoir-water-dynamics
    – aldo_tapia
    Commented Mar 29, 2023 at 19:57
  • @aldo_tapia Yes and I want to see how well the NDWI works. So, I want to compute the accuracy. Can you please suggest if this approach works?
    – th145
    Commented Apr 1, 2023 at 16:46
  • You need to manually digitalize the water bodies, using MODIS' LULC maps won't work well
    – aldo_tapia
    Commented Apr 2, 2023 at 21:24

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