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Novella
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64 lines
1.2 KiB
Markdown
64 lines
1.2 KiB
Markdown
# Zonal Statistics
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Calculate statistics for raster data within polygon zones.
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## Overview
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Zonal statistics calculates summary statistics (mean, sum, count, etc.) for raster pixel values within polygon zones.
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## Inputs
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- **Raster Dataset**: Raster dataset to analyze
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- **Zone Dataset**: Polygon dataset defining zones
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- **Statistics**: Statistics to calculate
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## Outputs
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New dataset containing:
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- Zone polygons
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- Raster statistics for each zone
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- Zone attributes
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## Statistics
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- **Mean**: Average pixel value
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- **Sum**: Sum of pixel values
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- **Count**: Number of pixels
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- **Min/Max**: Minimum/maximum pixel values
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- **StdDev**: Standard deviation of pixel values
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## Example
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```json
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{
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"raster_dataset_id": 125,
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"zone_dataset_id": 123,
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"statistics": ["mean", "sum", "count"]
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}
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```
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## Background Jobs
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This analysis runs as a background job.
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## Use Cases
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- Land cover analysis
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- Elevation statistics
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- Climate data aggregation
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- Raster value extraction
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## Notes
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- Zones must overlap raster extent
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- Statistics calculated for overlapping pixels
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- NoData values excluded
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- Processing time depends on raster and zone sizes
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## Related Documentation
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- [Analysis API](../api/analysis.md)
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- [Raster Tools](raster.md)
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