[GIS] Performing Raster Reclassification in QGIS

qgisrasterreclassify

Is there a way to perform a reclassify of a raster image in QGIS?

In ArcGIS Desktop you can do that in Spatial analyst Tools→Reclass→Reclassify

screenshot of Reclassify window

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I was able to reclassify a raster using the raster calculator

Here the "Habitat" raster is reclassed from continuous values (0-1) to discrete values of 1,2,3

("Habitat@1"  < 0.3)* 1 + (("Habitat@1" >= 0.3) AND ("Habitat@1" < 0.6)) *2  + ("Habitat@1"  >=0.6)* 3

Related Solutions

[GIS] Reclassifying float raster using QGIS

yes, r.reclass is for reclassing thematic rasters, like the Corine Land Cover. It will work for your data, but the routine will cast the float numbers to integers before doing the reclass, so it might lead to unexpected results.

What you are looking for is r.recode

The rules are defined in many formats, one of those is the following:

old_low:old_high:new_val (i.e. new_high == new_low)

So, based on your question the rules should be something along this lines:

rules.txt

1:1000:1
1000:2000:2
2000:3000:3
3000:4000:4
4000:5000:5
5000:6000:6
6000:7000:7
7000:8000:8
8000:9000:9
9000:*:10

So the command should be like this:

r.recode input=oldmap output=newmap rules="/path/to/rules.txt"

Afterwards you can use the r.reclass module for the newmap you created.

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Related Solutions

[GIS] Reclassifying float raster using QGIS

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