How to mask pixels of certain ndvi values?

Question

Devendra 2024-4-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2106801-how-to-mask-pixels-of-certain-ndvi-values

评论： Devendra 2024-4-15

采纳的回答： DGM

I am using following matlab code to divide the parcels into cropland and non cropland

if mean(parcel_ndvi(idx == 1)) > mean(parcel_ndvi(idx == 2))

cropland = 1;

noncropland = 2;

else

cropland = 2;

noncropland = 1;

end

mask = idx == cropland;

now I want to mask only those pixels within cropland whose ndvi values are greater than 0.4. I request you to please suggest me how to create the said mask. I would appreciate your kind help.

Devendra

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Answer 1

DGM 2024-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/2106801-how-to-mask-pixels-of-certain-ndvi-values#answer_1441161

在 MATLAB Online 中打开

Here's my guess.

% idx is apparently some sort of label array where the labels are unknown
% so this simply figures out which label corresponds to which class
if mean(parcel_ndvi(idx == 1)) > mean(parcel_ndvi(idx == 2))
    croplandidx = 1;
    noncroplandidx = 2;
else
    croplandidx = 2;
    noncroplandidx = 1;
end
% a logical mask of cropland
cropmask = idx == croplandidx;
% a logical mask of cropland with NDVI > 0.4
hi_ndvi_cropmask = cropmask & (parcel_ndvi > 0.4);