Fill NoData by Natural Neighbor Interpolation

Overview

Natural neighbor interpolation estimates NoData cells from surrounding valid neighbors based on local spatial relationships. It often produces smooth local transitions without requiring explicit search weights.

Use Cases

• Fill NoData holes where local neighborhood relationships should control the result.
• Prepare spatially continuous raster input for later zonal statistics, threshold extraction, or map production.
• Repair gaps before visualization or downstream analysis.

Parameters

Parameter	Description	Notes
Input raster file	Raster file whose NoData cells need natural neighbor interpolation	Required
Output raster file	Output raster file after natural neighbor interpolation	Required

Steps

1. Start the tool: Open Geoprocessing Toolbox → Spatial Analysis Tools > Raster Synthesis > Fill NoData, then start the Fill NoData by Natural Neighbor Interpolation tool pane.
2. Prepare input: Select the Input raster file and confirm that the data is complete and readable.
3. Set core parameters: Confirm that the NoData areas to be filled are appropriate for natural neighbor interpolation.
4. Set output: Specify the Output raster file and confirm that the output path, format, and naming rules meet downstream requirements.
5. Run and inspect the result: Click Run, then check whether filled cells, value range, and spatial position meet expectations.

Notes

• Natural neighbor interpolation works best with adequate valid neighbors around each NoData region.
• Use a projected coordinate system for distance-sensitive interpolation when possible.
• Sparse valid cells, uneven distribution, or outliers can reduce the reliability of the filled surface.