Raster Frequency Analysis by Raster
Overview
This tool uses a reference raster as the comparison baseline and counts, for each cell location, how many input raster values meet the selected comparison condition.
The output raster stores the frequency count at each cell location. Input rasters and the reference raster should use the same coordinate system, cell size, extent, and grid alignment.
Use Cases
- Compare multiple scenario rasters with a reference condition raster.
- Count how many time slices exceed, equal, or fall below the corresponding reference cell values.
- Generate a standardized intermediate raster for subsequent iXGIS analysis.
Parameters
| Parameter | Description | Notes |
|---|---|---|
| Input raster file | Raster files for frequency calculation. | Required. |
| Reference raster file | Raster used as the cell-by-cell comparison reference. | Required. |
| Comparison condition | Comparison operator used between each input raster cell value and the corresponding reference raster cell value. | Required. Default: greater. Options: greater than (greater), greater than or equal to (greater_equal), less than (less), less than or equal to (less_equal), equal to (equal), not equal to (not_equal). |
| Invalid value handling strategy | Controls how NoData values affect the output. | Optional. Default: False. True: the result is NoData only when all values are NoData. False: the result is NoData if any value is NoData. |
| Output raster file | Output raster containing the frequency count. | Required. |
Steps
- Open the Geoprocessing Toolbox in iXGIS, go to Spatial Analysis Tools > Local Analysis, and start Raster Frequency Analysis by Raster.
- Select the input raster files and the reference raster file.
- Set the comparison condition and invalid value handling strategy.
- 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
- For multi-raster calculations, verify that the coordinate system, cell size, extent, and grid alignment are consistent.
- Define how NoData participates in comparison and statistics before running the tool, then validate the output NoData encoding.