Circle Neighborhood Focal Statistics
Overview
This tool performs focal statistics using a circular neighborhood.
How It Works
Focal statistics use the current cell as the focal cell, aggregate surrounding cell values within the specified neighborhood, and write the result back to the focal cell location. A circular neighborhood applies an equal-distance search area around the focal cell.
Use Cases
- Smooth or summarize continuous raster values within a fixed radius.
- Analyze local context around each cell with no directional preference.
- Use as an intermediate raster in a longer iXGIS neighborhood analysis workflow.
Parameters
| Parameter | Description | Notes |
|---|---|---|
| Input raster file | Raster file for focal statistics. | Required. |
| Circle center X offset | X offset of the circle neighborhood center. | Required. Default: 0. |
| Circle center Y offset | Y offset of the circle neighborhood center. | Required. Default: 0. |
| Circle radius | Radius of the circular neighborhood, in the raster coordinate system units. | Required. Default: 100. |
| Statistical method | Statistic calculated from cell values in the circular neighborhood. | Required. Default: nan_average. Options: sum ignoring invalid values (nan_sum), maximum ignoring invalid values (nan_max), minimum ignoring invalid values (nan_min), range ignoring invalid values (nan_range), average ignoring invalid values (nan_average), variance ignoring invalid values (nan_variance). |
| Output raster file | Output raster containing the circular neighborhood focal statistics result. | Required. |
Steps
- Open the Geoprocessing Toolbox in iXGIS, go to Spatial Analysis Tools > Neighborhood Analysis > Focal Statistics, and start Circle Neighborhood Focal Statistics.
- Select the input raster file and confirm that it can be read correctly.
- Set the circle center offsets, radius, and statistical method.
- Specify the output raster file and confirm the output path, format, and file name.
- Click Run. After the task completes, review the output value range and spatial pattern.
Notes
- Verify that the raster coordinate system, cell size, and units are appropriate for the radius setting.
- The radius uses the raster coordinate system units, not necessarily meters.