ArcGIS REST API

Stream Link

Description

Stream link diagram

The Stream Link task assigns unique values to sections of a raster linear network between intersections.

Links are the sections of a stream channel connecting two successive junctions, a junction and the outlet, or a junction and the drainage divide.

The input stream raster can be created by thresholding the results of the FlowAccumulation task.

The stream raster linear network should be represented as value greater than or equal to one on a background of NoData.

Request parameters

ParameterDetails
inputStreamRaster

(Required)

The input raster that represents a linear stream network.

Syntax: This parameter can be specified as a Portal Item ID, a URL to a raster image service layer, a cloud raster dataset, or a shared raster dataset.

Examples:

//Portal item as input raster
"inputStreamRaster": {"itemId": <portal item id>}

//URL as input raster
"inputStreamRaster": {"url": <image service layer url>}

inputFlowDirectionRaster

(Required)

The input raster that shows the direction of flow out of each cell.

Syntax: This parameter can be specified as a Portal Item ID, a URL to a raster image service layer, a cloud raster dataset, or a shared raster dataset.

Examples:

//Portal item as input raster
"inputFlowDirectionRaster": {"itemId": <portal item id>}

//URL as input raster
"inputFlowDirectionRaster": {"url": <image service layer url>}

outputName

(Required)

The output image service name that will be created.

You can specify the name, or you can create an empty service using Portal Admin Sharing API and use the return JSON object as input to this parameter.

Syntax: A JSON object describes the name of the output or the output raster.

Output name example:

"outputName":{"serviceProperties":{"name":"testrasteranalysis"}}

Output raster examples:

//Output portal item:
"outputName":{"itemId": <portal item id>}

//Output url:
"outputName":{"url": <image service url}

//Output raster layer service:
"outputName":{"serviceProperties":
  {"name":"testrasteranalysis",
    "serviceUrl":"https://<server name>/server/rest/services/Hosted/testrasteranalysis/ImageServer"},
  "itemProperties":{"itemId":"8cfbd3ec25584d0d8f4ed23b8ff7c43b","folderId":"sdfwerfbd3ec25584d0d8f4"}
}

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.
  • Mask (mask): Only cells that fall within the analysis mask will be considered in the operation.
f

The response format. The default response format is html.

Values: html | json

Response

When you submit a request, the task assigns a unique job ID for the transaction.

{
  "jobId": "<unique job identifier>",
  "jobStatus": "<job status>"
}

After the initial request is submitted, you can use the jobId to periodically check the status of the job and messages as described in Checking job status. Once the job has successfully completed, you use the jobId to retrieve the results. To track the status, you can make a request of the following form:

https://<raster analysis tools url>/StreamLink/jobs/<jobId>

When the status of the job request is esriJobSucceeded, you can access the results of the analysis by making a request of the following form:

https://<raster analysis tools url>/StreamLink/jobs/<jobId>/results/outputRaster

Example usage

Below is a sample request URL for StreamLink.

https://services.myserver.com/arcgis/rest/services/System/RasterAnalysisTools/GPServer/StreamLink/submitJob

JSON response example

The response returns the outputRaster output parameter, which has properties for parameter name, data type, and value. The content of value is always the output raster dataset itemId and the image service URL.

{
  "paramName": "outRaster",
  "dataType": "GPString",
  "value": {
    "itemId": "f121390b85ef419790479fc75b493efd", 
    "url": "https://<server name>/arcgis/rest/services/Hosted/<service name>/ImageServer"
  }
}