How to mask pixels of certain ndvi values?

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

Answer 1

[DGM]

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);

[Devendra]

Thanks a lot for your kind help. I appreciate your kind cooperation and support.

Deva