Hi, depends what you want ...

Published by Patrick Rambosson, Process and Sales Engineer at Lenntech BV

Hi,

depends what you want to do. Generally, NDWI is used to identify Water bodies or vegetation cover.

Please find here an article with some methodology which could help you :

https://repository.library.fresnostate.edu/bitstream/handle/10211.3/191777/Using%20the%20Normalized%20Difference%20Water%20Index.pdf?sequence=1

It also addresses some boundary problems (depending on your workscale, you might have or have not that problem).

Regards

Note : using a quick google search might be helpful how to analyze this kind of parameters.

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Maybe that there are no waterbodies in your analysed area ?

I don't know yout project nor what area you are analysing. Maybe a calculation mistake ?

Compare the results to the actual satellite image and check how it compares.

I can't help much more then that from here.

Published by Patrick Rambosson, Process and Sales Engineer at Lenntech BV

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In this paper they are using the assertion based on McFeeters paper that, NDWI values greater than zero are identified as water surfaces. But, what if I have NDWI values in the range of negative values only, added that it contains water bodies. I have Landsat image of Jaipur for 15th May, and calculated NDWI using Green & NIR band. I'm getting the NDWI value ranging from -0.268 to -0.134. What should I interpret from this result then?

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Gajanan Kothawade visualize your satellite imagery in FCC. Check if there are any waterbodies visually. Jaipur + Summer could mean relatively less water bodies. Right? 

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