Stretch Renderer

This renderer displays continuous raster cell values across a gradual ramp of colors. Use this renderer to draw a single band of continuous data. This renderer works well when you have a large range of values to display, such as with imagery or scientific data.

Referenced by: Raster Renderers

Properties

Property	Details
colorRamp	A colorRamp object is used to specify a range of colors that are applied to a group of symbols.
computeGamma	Indicates if gamma values should be computed by default.
dra	Indicates if Dynamic Range Adjustment should be applied.
gamma[]	The list of Gamma value(s).
max	The current maximum output value.
maxPercent	The current maximum percent value.
min	The current minimum output value.
minPercent	The current minimum percent value.
numberOfStandardDeviations	The number of standard deviations for standard deviation stretch.
sigmoidStrengthLevel	Set this from (1 to 6) to adjust the curvature of Sigmoid curve used in color stretch.
statistics[]	The custom raster stretch statistics.
stretchType	The stretch types for stretch raster function. Valid values: histogramEqualization, minMax, none, percentClip, sigmoid, standardDeviation
type	Specifies the type of renderer used. Valid value of this property rasterStretch
useGamma	Indicates if the renderer applies Gamma stretch.

Additional information

For each stretchType there are specific sets of requirements that are as follows:
none: does not require other parameters.
standardDeviation: requires numberOfStandardDeviations, statistics, or dra.
histogramEqualization: requires the source dataset to have histograms or additional dra.
minMax: requires statistics or dra.
percentClip: requires minPercent, maxPercent, and dra.
sigmoid: does not require other parameters. Optionally, set the sigmoidStrengthLevel (1 to 6) to adjust the curvature of Sigmoid curve used in color stretch.

Example

{
  "type": "rasterStretch",
  "statistics": [
    [
      22.5,
      10.5,
      15,
      1
    ]
  ]
}