Reclassify raster layer

This algorithm reclassifies a raster by assigning new class values based on a class mapping.

Usage:

1. Start the algorithm from the Processing Toolbox panel.

2. Select a raster to process.

3. Under Class mapping note which raster values shall be reclassified by writing the original value, followed by the new value, e. g. [1:1, 2:1, 3:2 …]. In this example, classes 1 and 2 will be combined into a new class 1, while class 3 will be assigned a new value of 2.

4. Optionally you can define class names and visualisation under Categories as seen in the example below. Then, click run.

   

Parameters

Raster layer [raster]

A raster layer to be reclassified.

Class mapping [string]

A list of source to target class value mappings. E.g. to merge source values 1 and 2 into target value 1, and source values 3 and 4 into target value 2, use {1:1, 2:1, 3:2, 4:2}

Categories [string]

A list of target categories in short notation: [(1, ‘Class A’, ‘#e60000’), (2, ‘Class B’, ‘#267300’)]

No data value [number]

Value used to fill no data regions. Default: 0

Outputs

Output classification layer [rasterDestination]

Raster file destination.

Command-line usage

>qgis_process help enmapbox:ReclassifyRasterLayer:

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Arguments
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raster: Raster layer
    Argument type:  raster
    Acceptable values:
            - Path to a raster layer
mapping: Class mapping
    Argument type:  string
    Acceptable values:
            - String value
            - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
            - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
categories: Categories (optional)
    Argument type:  string
    Acceptable values:
            - String value
            - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
            - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
noDataValue: No data value
    Default value:  0
    Argument type:  number
    Acceptable values:
            - A numeric value
            - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
            - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
outputClassification: Output classification layer
    Argument type:  rasterDestination
    Acceptable values:
            - Path for new raster layer

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Outputs
----------------

outputClassification: <outputRaster>
    Output classification layer