Query land use (Raster calculator)

Question

I have a land use raster file and am trying to use the raster calculator to query the file for surface water.

The saga formula (11 = surface water band):

(a, 11)

This does not work.

Can anyone help me with the raster calc syntax to perform this?

I am using QGIS
– Andrew Rickard
Commented Jun 6, 2019 at 5:47 — Andrew Rickard, Commented Jun 6, 2019 at 5:47

Kazuhito · Accepted Answer · 2019-06-06 10:11:00Z

2

Try eq(a, 11)

With an example of 6x6 dummy raster (values 1-6 and NoData=0): giving eq(a, 3)

It will return a new raster which 3 has become 1, and others are 0 (thus transparent NoData).

In case you want to extract the cell value 11 itself, try a*eq(a, 11) instead (the righthand side image).

answered Jun 6, 2019 at 9:53

Kazuhito

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Thanks for the answer and for the explanation!
– Andrew Rickard
Commented Jun 7, 2019 at 5:23
@AndrewRickard kindly accept the answer if your problem is solved.
– Padmanabha
Commented Sep 17, 2023 at 19:04

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