area of water body in a grey color image

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Poornima Posa
Poornima Posa 2021-10-21
回答： yanqi liu 2021-10-27
how to get area of water body in one band of a landsat image
  2 个评论
KSSV
KSSV 2021-10-21
What data you have? What exactly you want to do?
Poornima Posa
Poornima Posa 2021-10-21
i have band 4 of a landsat data, i need to find area of waterbody in that band

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回答（2 个）

Bjorn Gustavsson
Bjorn Gustavsson 2021-10-21
If the water-surface are flatter than the not-water-surfaces (seems reasonable assumption for standard optical satellite imaging without additional information), then you might try to look after regions where the magnitude of the gradients are small:
Im = double(your_one_band_landsat_image);
[dIdx,dIdy] = gradient(Im);
d2I = del2(Im);
subplot(1,3,2)
imagesc(Im)
subplot(1,3,1)
imagesc(d2I)
subplot(1,3,3)
imagesc(abs(dIdx)+abs(dIdy)) % other measures of flatness are also available
HTH
yanqi liu
yanqi liu 2021-10-27
sir，may be upload some image sample to develop.

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