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AR1/docs/analysis-tools/zonal-stats.md

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Zonal Statistics

Calculate statistics for raster data within polygon zones.

Overview

Zonal statistics calculates summary statistics (mean, sum, count, etc.) for raster pixel values within polygon zones.

Inputs

  • Raster Dataset: Raster dataset to analyze
  • Zone Dataset: Polygon dataset defining zones
  • Statistics: Statistics to calculate

Outputs

New dataset containing:

  • Zone polygons
  • Raster statistics for each zone
  • Zone attributes

Statistics

  • Mean: Average pixel value
  • Sum: Sum of pixel values
  • Count: Number of pixels
  • Min/Max: Minimum/maximum pixel values
  • StdDev: Standard deviation of pixel values

Example

{
  "raster_dataset_id": 125,
  "zone_dataset_id": 123,
  "statistics": ["mean", "sum", "count"]
}

Background Jobs

This analysis runs as a background job.

Use Cases

  • Land cover analysis
  • Elevation statistics
  • Climate data aggregation
  • Raster value extraction

Notes

  • Zones must overlap raster extent
  • Statistics calculated for overlapping pixels
  • NoData values excluded
  • Processing time depends on raster and zone sizes

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