how do we calculate vegetation using ndvi------can u plz provide me with the code

ndvi

[Cyrus]

what type of image are you using? LandSat8? RapidEye?

[sajeela khan]

can u plz tell me the difference between them LandSat8 RapidEye

[Manisha Kumawat]

Can i apply this code on irs Resoursesat images

Answer 1

[Cyrus]

if it is landsat8 image:

Formula: NDVI = (NIR -R) / (NIR + R)

File_Path = 'path\'; %%keep the \
File_Name = 'LC80292015263LGN00_B';

Band_Number = '3';
Full_File_Name = strcat(File_Path, File_Name, Band_Number, '.TIF');
[G, ~] = geotiffread(Full_File_Name);
clearvars Band_Number Full_File_Name

Band_Number = '4';
Full_File_Name = strcat(File_Path, File_Name, Band_Number, '.TIF');
[R, ~] = geotiffread(Full_File_Name);
clearvars Band_Number Full_File_Name

Band_Number = '5';
Full_File_Name = strcat(File_Path, File_Name, Band_Number, '.TIF');
[NIR, ~] = geotiffread(Full_File_Name);
clearvars File_Path File_Name Band_Number Full_File_Name

G_heq = histeq(G);
R_heq = histeq(R);
NIR_heq = histeq(NIR);

NIR = double(NIR_heq);
R = double(R_heq);
G = double(G_heq);

NDVI = (NIR -R) ./ (NIR + R);
figure(), imshow(NDVI, []), title('NDVI');
colormap(jet);
colorbar;
impixelinfo

[yun li]

Excuse me, how to calculate NDVI for an image with multi-band information?

Answer 2

[sajeela khan]

how can we find the NDVI using miltispectral image

[Amit Bhasin]

Hey Cyrus,

Thank for the answer. What if I have images collected (multispecratl images; 5 bands; R,G,B, NIR, Red-edge) from a drone?

Thanks