dojo.require("esri.layers.RasterFunction")
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
Properties
Methods
toJson() | Object | Returns an easily serializable object representation of the raster function. |
Constructor Details
Creates a new RasterFunction object.
Sample:
var rasterFunction = new esri.layers.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:
<Object > json |
Required |
A json string representing a serialized version of a raster function. |
Sample:
var rasterFunction = new esri.layers.RasterFunction(
{
"functionName" : "Colormap",
"functionArguments" : {
"ColormapName" : "Random"
},
"variableName" : "Raster"
}
);
Property Details
The 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
};
The raster function name. View the
Raster Functions documentation in the REST help for more details.
Sample:
rasterFunction.functionName = "Hillshade";
Defines 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"
Variable name for the raster function.
Sample:
rasterFunction.variableName = "DEM";
Method Details
Returns an easily serializable object representation of the raster function.