I made cross matrix for change detection but last diagonal value is zero what does it mean?

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I made a cross tabulation by using Arc GIS but last field have 0 value in diagonal cell what does it mean i didn't understand?

last field is of water body

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How to use Remote sensing and GIS applications for mapping the available medicinal plants within the locality/municipality?

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Sajjad Munir

Null values/ no data.

Sita Karki

May be you might have defined the fields as "Integer, long/short", in that case, it assigns zero for value very close to zero. It should be "Double" or "Float" data type.

Indishe Senanayake

It's bit unclear what is represented by the rows in your attribute table.

If your field type is 'integer', then the zero values can be values less than zero.

I think Syed Shajee Mehdi have done image classification and these values are calculated by the software. I agree with you both that 0 zero corresponds to any value less than zero and the data type needs to be changed to float or double.