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62 lines
1.3 KiB
Markdown
62 lines
1.3 KiB
Markdown
# Join Features
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Attach attributes from a target dataset to a source dataset based on spatial relationships.
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## Overview
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Join features attaches attributes from a target dataset to features in a source dataset based on spatial relationships (intersect, within, contains, etc.).
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## Inputs
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- **Source Dataset**: Dataset to join to
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- **Target Dataset**: Dataset to join from
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- **Spatial Relationship**: Intersect, within, contains, etc.
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- **Aggregation** (optional): Aggregation functions for multiple matches
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## Outputs
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New dataset containing:
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- Source feature geometry
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- Attributes from both datasets
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- Aggregated values (if aggregation specified)
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## Aggregation Functions
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- **Sum**: Sum of numeric values
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- **Average**: Average of numeric values
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- **Count**: Count of matching features
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- **Min/Max**: Minimum/maximum values
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## Example
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```json
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{
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"source_dataset_id": 123,
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"target_dataset_id": 124,
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"relationship": "intersect",
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"aggregation": {
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"population": "sum"
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}
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}
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```
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## Use Cases
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- Attribute enrichment
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- Spatial data integration
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- Aggregated statistics
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- Data combination
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## Notes
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- Multiple target features can match one source feature
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- Aggregation required for multiple matches
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- Spatial relationship affects results
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- Processing time depends on dataset sizes
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## Related Documentation
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- [Analysis API](../api/analysis.md)
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