I want to extract flood related pixels from my imagery.

I calculated mLSWI(Modified Land Surface Water Index).

According to the literatures, mLSWI >= 0.5 is flood pixels.

How do I identify the flood pixels in my imagery?

I am using ArcGIS Desktop 10.0.

  • I am using ArcGIS 10.0.
    – Anuja Negi
    Nov 11, 2015 at 6:46
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    Nov 11, 2015 at 7:25

1 Answer 1


You can use Reclassify (Spatial Analyst) or Con (Spatial Analyst) to perform this type of image thresholding. In your case, it is common to assign pixel values of interest a value of 1 and everything else a value of 0. The parameters are pretty self explanatory for the Reclassify tool. Con, on the other hand, is a bit more cryptic. Here is an example of the type of syntax you would need for Con:

enter image description here

In other words, if the pixel value is >= 0.5, assign a value of 1, otherwise assign a value of 0.

  • 1
    This is what exactly I was trying to do. Thank You.
    – Anuja Negi
    Nov 11, 2015 at 10:33

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