Use a stretch renderer to enhance the visual contrast of raster data for analysis.
Use case
An appropriate stretch renderer can enhance the contrast of raster imagery, allowing the user to control how their data is displayed for efficient imagery analysis.
How to use the sample
Choose one of the stretch parameter types:
- Standard deviation - a linear stretch defined by the standard deviation of the pixel values
- Min-max - a linear stretch based on minimum and maximum pixel values
- Percent clip - a linear stretch between the defined percent clip minimum and percent clip maximum pixel values
Then configure the parameters.
How it works
- Create a raster from a raster file using
Raster.init(fileURL:). - Create a raster layer from the raster using
RasterLayer.init(raster:). - Add the layer to the map using
Map.addOperationalLayer(_:). - Create a stretch renderer, specifying the stretch parameters and other properties using
StretchRenderer.init(parameters:gammas:estimatesStatistics:colorRamp:). - Set the renderer on the raster layer using
RasterLayer.renderer.
Relevant API
- ColorRamp
- MinMaxStretchParameters
- PercentClipStretchParameters
- Raster
- RasterLayer
- StandardDeviationStretchParameters
- StretchParameters
- StretchRenderer
Offline data
This sample uses the Shasta raster. It is downloaded from ArcGIS Online automatically.
About the data
This sample uses a raster imagery tile of an area of forested mountainous terrain and rivers.
Additional information
See Stretch function in the ArcGIS Pro documentation for more information about the types of stretches that can be performed.
Tags
analysis, deviation, histogram, imagery, interpretation, min-max, percent clip, pixel, raster, stretch, symbology, visualization