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