Analyze Changes Using CCDC

inputMultidimensionalRaster

(Required)

The Portal Item ID, Image Service URL, cloud multidimensional raster dataset or shared multidimensional raster dataset.

Syntax: JSON object describes the input multidimensional raster. At least one type of input needs to be provided in the JSON object. If multiple inputs are given, the itemid takes the priority.

Example:

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{"itemId": <portal item id>}
{“url”: <image service url>}
{“uri”: <cloud raster uri or shared data path>}

outputName

(Required)

Output hosted image service properties. If the hosted image service is already created, the portal item ID or service URL can be given to the service tool. The output path of the multidimensional raster dataset generated in the raster store will be used to update the existing service definition. The service tool can also generate new hosted image service with the given service properties.

The output hosted image service is stored in raster store and shared on either the Raster Analysis Image Server or Image Hosting Image Server depending on the Enterprise configuration.

Syntax: JSON object describes the output multidimensional raster. At least one type of input needs to be provided in the JSON object. If multiple inputs are given, the itemId takes priority.

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outputName={"itemId": <portal item id>}
outputName={“url”: <image service url>}
outputName={“uri”: <cloud raster uri or shared data path>}
or
{
  "serviceProperties": {
    “name”: ”aggregated_watertemp_salinity”,
    ”capabilities”: ”image, metadata”
  }
}

bandsForDetectingChange

(Optional)

The band IDs to use for change detection. If no band IDs are provided, all the bands from the input raster dataset will be used.

Syntax: List of band IDs

Example:

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bandsForDetectingChange=[1,2,3,4,6]

bandsForTemporalMasking

(Optional)

The band IDs of the green band and the SWIR band, to be used to mask for cloud, cloud shadow and snow. If band IDs are not provided, no masking will occur.

Syntax: List of band IDs

Example:

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bandsForTemporalMasking=[1,4]

chiSquaredThreshold

(Optional)

The chi-square change probability threshold. If an observation has a calculated change probability that is above this threshold, it is flagged as an anomaly, which is a potential change event. The default value is 0.99.

Syntax: Double representing the chi-square threshold.

Example

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chiSquaredThreshold=0.99

minAnomalyObservations

(Optional)

The minimum number of consecutive anomaly observations that must occur before an event is considered a change. A pixel must be flagged as an anomaly for the specified number of consecutive time slices before it is considered a true change. The default value is 6.

Syntax: Integer representing the minimum consecutive anomaly observations

Example:

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minAnomalyObservations=6

updateFrequency

The frequency, in years, at which to update the time series model with new observations. The default value is 1.

Syntax: Double representing the frequency.

Example

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updateFrequency=1

context

Contains additional settings that affect task execution. This task has the following settings:

• Extent (extent)—A bounding box that defines the analysis area.
• Output Spatial Reference (outSR)—The output raster will be projected into the output spatial reference.
• Snap Raster (snapRaster)—The output raster will have its cells aligned with the specified snap raster.
• Cell Size (cellSize)—The output raster will have the resolution specified by cell size.
• Parallel Processing Factor (parallelProcessingFactor)—The specified number or percentage of processes will be used for the analysis.

Example:

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context={"cellSize": "20", "parallelProcessingFactor": "4"}

f

The response format. The default response format is html.

Values: html | json

outputMultidimensionalRaster

The output multidimensional raster itemId and URL

Example:

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{"url": "http://<raster analysis url>/AnalyzeChangesUsingCCDC/jobs/<jobId>/results/outputCCDCAnalysisRaster"}

The result has properties for parameter name, data type, and value. The content of the value is always the output raster dataset's itemId and image service URL.

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{
  "paramName": "outputCCDCAnalysisRaster",
  "dataType": "GPString",
  "value": {
    "itemId": "c267610d0feb4370bf38cc6e2c4ac261",
    "url": "https://<server name>/arcgis/rest/services/Hosted/<service name>/ImageServer"
  }
}