require(["esri/smartMapping/raster/renderers/stretch"], (rasterStretchCreator) => { /* code goes here */ });
import * as rasterStretchCreator from "@arcgis/core/smartMapping/raster/renderers/stretch.js";
esri/smartMapping/raster/renderers/stretch
This object contains helper methods for generating a single-band stretch visualization for raster layers (i.e. ImageryLayer, ImageryTileLayer, or WCSLayer).
The createRenderer method in this module generates a renderer that may be applied directly to the input layer.
Method Overview
| Name | Return Type | Summary | Object |
|---|---|---|---|
| Promise<RasterStretchColorrampResult> | Generates a RasterStretchRenderer to render data from a single raster band. | stretch |
Method Details
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createRenderer
MethodcreateRenderer(params){Promise<RasterStretchColorrampResult>} -
Generates a RasterStretchRenderer to render data from a single raster band.
ParametersSpecificationparams ObjectInput parameters for generating a single-band stretch visualization. See the table below for details of each parameter. The
colorRamp,gamma,useGamma,dynamicRangeAdjustmentparameters are not related to stretch type. Pass them in to preserve the existing renderer settings if desired.SpecificationThe input layer for which the renderer is generated.
renderingRule RasterFunctionoptionalDeprecated since 4.27. Use
rasterFunctioninstead.rasterFunction RasterFunctionoptionalSpecifies the function for how the requested image should be processed. When
rasterFunctionis applied, the server returns updated service information that reflects custom processing as defined by the raster function. If not provided, the output renderer is created using the layer'srasterFunction.stretchType StringoptionalA preferred stretch type can be provided. See RasterStretchRenderer.stretchType for more information.
Possible Values:"none"|"min-max"|"standard-deviation"|"histogram-equalization"|"percent-clip"|"sigmoid"
bandId NumberoptionalThe 0-based index of a selected band.
colorRamp AlgorithmicColorRamp|MultipartColorRampoptionalThe color ramp to apply to the renderer.
variableName StringoptionalOnly applicable to multidimensional datasets where a raster layer can contain more than one variable (such as temperature, humidity, wind speed) with different statistics. Indicate the variable name here.
optional The gamma values to be used if
useGammaistrue. Gamma refers to the degree of contrast between the mid-level gray values of a raster dataset. It does not affect the black or white values in a raster dataset, only the middle values. By applying a gamma correction, you can control the overall brightness of an ImageryLayer. Gamma stretching is only valid whenstretchTypeisnone,standard-deviation, ormin-max. See RasterStretchRenderer.gamma for more information.useGamma BooleanoptionalIndicates whether the
gammavalues should be used. Whenfalse, the gamma is calculated from the statistics and histogram of the data.dynamicRangeAdjustment BooleanoptionalWhen
true, calculates the renderer's statistics based on the current display extent and recalculates them as you zoom and pan around the image.estimateStatistics BooleanoptionalUseful in scenarios where an image service does not have statistics. When
true, this function estimates global statistics to keep a constant visual on pan and zoom, unlikedynamicRangeAdjustmentwhich recalculates statistics on each extent change.signal AbortSignaloptionalAllows for cancelable requests. If canceled, the promise will be rejected with an error named
AbortError. See also AbortController.ReturnsType Description Promise<RasterStretchColorrampResult> Resolves to an object containing a stretch renderer that can be set on the input renderer.
Type Definitions
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The result object of the createRenderer() method. See the table below for details of each property.
- Properties
-
renderer RasterStretchRenderer
The RasterStretchRenderer renderer to apply to the input layer.
bandId NumberThe zero-based index of the band represented by the renderer.