Assign NoData

Overview

This tool assigns a NoData value to an input raster file and outputs a new raster result. It cannot assign a NoData value to raster data that already has a NoData definition.

How It Works

This tool marks the specified cell value as NoData and writes the NoData definition to the output raster. Marked cells are usually treated as invalid areas in subsequent statistics, calculations, or interpolation, while other cell values and the spatial grid remain unchanged.

Use Cases

• Quickly generate standardized results when a raster NoData value needs to be assigned.
• Use as an intermediate step in a longer GIS processing chain before downstream analysis.
• Improve efficiency in batch processing, repeated runs, or standardized delivery workflows.

Parameters

Parameter	Description	Notes
Input raster file	The raster file to which a NoData value will be assigned.	Required
NoData value	The NoData value to assign to the raster.	Required
Output raster file	The raster file with the assigned NoData value.	Required

Steps

1. Start the tool: Open the Geoprocessing Toolbox, go to Raster Tools > Raster Processing, and open the Assign NoData tool pane.
2. Prepare the input: Select Input raster file and confirm that the input data is complete and readable.
3. Set core parameters: Enter the NoData value to assign based on the raster data and analysis requirements.
4. Set the output: Specify Output raster file, and confirm that the output path, format, and naming rules meet downstream requirements.
5. Run and check the result: Click Run to execute the task. After it finishes, check whether the output extent, value distribution, NoData encoding, and spatial position meet expectations.

Notes

• When multiple rasters are used together in analysis, first confirm that their coordinate systems, resolutions, extents, and grid alignment are consistent.
• For NoData processing, clarify whether NoData values participate in statistics, comparisons, or interpolation, and verify the output NoData encoding.