I have produced a crop map, and I need to calculate a number of biophysical variables using specific equations for specific crop class . I did it before using Matlab.
But how can I do that using ENVI-Band math ?
Thanks
This is very easy.
first you mak mask of your crop types
calculate biophysical parameters for each type using specific formula that you have developed.
at last you mosaic all the maps obtained from above steps.
Hi Nadia,
Just open Band math and type the equation for example in case f NDVI:
(b2-b1)/(b2+b1)
Once you wrote this equation, in the next stage you have to choose 'b1' and 'b2' accordingly, which in this case are NIR and IR bands. The rest is straight forward.
Be careful about your data type, if your images are integer(e.g. uint16), you then need to make a small change to the equation by adding float(b1)-float(b2) to avoid getting zero/one results.
Good luck!
Dear Dharmendra Singh,
Thank you, your answer is very helpful. I will apply this method and return back to you.
Regards,
Nadia
Dear Ali Mousivand,
Glad to read from you.
My question is about the classification classes, how to use specific formula for each class using ENVI- band math ?
Dr Dharmendra Singh advised me to use a mask for each class, and mosaic all classes results at the end.
if you have any other ideas, don't hesitate please. Thank you
Regards,
Nadia
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