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Class: RasterFunction
[ AMD Module Require | Legacy Module Require ]
require(["esri/layers/RasterFunction"], function(RasterFunction) { /* code goes here */ });
Description
(Added at v2.0)
Specifies the processing to be done to the image service. Click here to view a full list of available raster funtions in the REST API documentation along with their valid functionArguments. Chaining raster functions is accomplished by setting the Raster argument in the functionArguments property to another defined raster function. See example below on chaining a Remap raster function with a Colormap.
var remapRF = new RasterFunction();
remapRF.functionName = "Remap";
remapRF.functionArguments = {
"InputRanges" : [-3,10,11,37], //remap pixels with values -3 to 10 to now have value of 1
"OutputValues" : [1,2], //remap pixel values from 11 to 37 to have a value of 2
"Raster" : "$$" //apply Remap to the image service
};
remapRF.outputPixelType = "U8";
var colorRF = new RasterFunction();
colorRF.functionName = "Colormap";
colorRF.functionArguments = {
"Colormap" : [
[1, 255, 0, 0], //all pixels with value of 1 symbolized with red
[2, 0, 255, 0] //all pixels with value of 2 symbolized with green
],
"Raster" : remapRF //apply Colormap to output raster from the remap rasterFunction
};
imageServiceLayer.setRenderingRule(colorRF); //set rendering rule to final raster function
Samples
Search for samples that use this class.Constructors
| Name | Summary |
|---|---|
| new RasterFunction() | Creates a new RasterFunction object. |
| new RasterFunction(json) | Create a new Raster Function object using a json string representing a serialized version of a raster function. |
Properties
| Name | Type | Summary |
|---|---|---|
| arguments | Object | Deprecated at v3.10, use functionArguments instead. |
| functionArguments | Object | The arguments for the raster function. |
| functionName | String | The raster function name. |
| outputPixelType | String | Defines the output image's pixel type. |
| variableName | String | Variable name for the raster function. |
Methods
| Name | Return type | Summary |
|---|---|---|
| toJson() | Object | Returns an easily serializable object representation of the raster function. |
Constructor Details
Creates a new RasterFunction object.
Sample:
require([
"esri/layers/RasterFunction", ...
], function(RasterFunction, ... ) {
var rasterFunction = new RasterFunction();
rasterFunction.functionName = "Hillshade";
...
});
Create a new Raster Function object using a json string representing a serialized version of a raster function. (Added at v3.5)
Parameters:
< |
Required | A json string representing a serialized version of a raster function. |
Property Details
<Object
ObjectDeprecated at v3.10, use functionArguments instead.
<Object
ObjectThe arguments for the raster function. The structure depends on the function specified. (Added at v3.5)
Sample:
rasterFunction.functionArguments = {
"Azimuth":215.0,
"Altitude":75.0,
"ZFactor":0.3
};<String
StringThe raster function name. View the Raster Functions documentation in the REST help for more details.
Sample:
rasterFunction.functionName = "Hillshade";
<String
StringDefines the output image's pixel type. (Added at v3.13)
Known values:
"C128" | "C64" | "F32" | "F64" | "S16" | "S32" | "S8" | "U1" | "U16" | "U2" | "U32" | "U4" | "U8" | "UNKNOWN"Default value:
"UNKNOWN"<String
StringVariable name for the raster function.
Sample:
rasterFunction.variableName = "DEM";
Method Details
Returns an easily serializable object representation of the raster function.
Return type:
Object