🖌️Style raster data
Overview
Raster styling defines how raster data is visually rendered in the viewer.
It does not modify the underlying dataset, only its visual representation.
A video walkthrough is available below.
Applying styles
To style a raster layer, open the layer in the viewer and access the styling configuration.
Raster styling is based on raster bands and expressions applied to pixel values.
Styling methods
🟠 Channel-based styling (channelMap)
Channel-based styling defines how raster bands are mapped to visual color channels.
For example:
Red channel → Band 1
Green channel → Band 2
Blue channel → Band 3
You can also define custom expressions using raster bands to control how values are visualised.
This method is commonly used for true color or false color imagery.
🟠 Range-based styling (rangeMap)
Range-based styling assigns colors based on the range in which a computed value falls.
The input can be:
a single raster band
or a custom expression combining multiple bands
This method is commonly used for continuous data such as elevation, temperature or intensity values.
🟠 Value-based styling (valueMap)
Value-based styling assigns colors to discrete output values derived from a raster expression.
Values are evaluated per pixel and mapped to specific colors.
This is typically used for:
raster data containing classifications
categorical outputs
segmented analysis results
🟠 Condition-based styling (caseMap)
Condition-based styling applies colors based on logical conditions.
Conditions can be defined using expressions that evaluate raster values.
This method is useful for rule-based visualisation, where different scenarios are represented with distinct styles.
Key concept
Raster styling operates on pixel values and expressions, not on vector-like features.
It defines how data is rendered, not how it is stored or processed.
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