Skip To Content
ArcGIS Developer



Fill task

The Fill task fills sinks in a surface raster to remove small imperfections in the data.

A sink is a cell with an undefined drainage direction; no cells surrounding it are lower. The pour point is the boundary cell with the lowest elevation for the contributing area of a sink. If the sink was filled with water, this is the point where water would pour out.

The z-limit specifies the maximum difference allowed between the depth of a sink and the pour point and determines which sinks will be filled and which will remain untouched. The z-limit is not the maximum depth to which a sink will be filled.

For example, consider a sink area where the pour point is 210 feet in elevation, and the deepest point within the sink is 204 feet (a difference of 6 feet). If the z-limit is set to 8, this particular sink will be filled. However, if the z-limit is set to 4, this sink will not be filled; since the depth of this sink exceeds this difference, it would be considered a valid sink.

All sinks that are less than the z-limit, and lower than their lowest adjacent neighbor, will be filled to the height of their pour points.

Request parameters



The input raster representing a continuous surface.

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.


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

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


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:


Output raster examples:

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

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

//Output raster layer service:
    "serviceUrl":"https://<server name>/server/rest/services/Hosted/testrasteranalysis/ImageServer"},


Maximum elevation difference between a sink and its pour point to be filled.

If the difference in z-values between a sink and is pour point is greater than the z_limit, that sink will not be filled.

The value for z-limit must be greater than zero.

Unless a value is specified for this parameter, all sinks will be filled, regardless of depth.

Syntax: A numerical value.


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.

The response format. The default response format is html.

Values: html | json | pjson


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>/Fill/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>/Fill/jobs/<jobId>/results/outputRaster

Example usage

Below is a sample request URL for Fill.

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"