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Nearest Neighbor Analysis
Find nearest features from a target dataset for each feature in a source dataset.
Overview
Nearest neighbor analysis identifies the closest features between two datasets, calculating distances and joining attributes.
Inputs
- Source Dataset: Dataset to find nearest neighbors for
- Target Dataset: Dataset to search for neighbors
- Max Distance: Maximum search distance (optional)
- Limit: Maximum neighbors per feature (default: 1)
Outputs
New dataset containing:
- Source feature geometry
- Nearest target feature information
- Distance: Distance to nearest neighbor
- Attributes from both datasets
Example
{
"source_dataset_id": 123,
"target_dataset_id": 124,
"max_distance": 5000,
"limit": 1
}
Background Jobs
This analysis runs as a background job. See Nearest Analysis Worker for details.
Use Cases
- Service accessibility analysis
- Nearest facility identification
- Distance calculations
- Spatial joins
Notes
- Spatial indexes critical for performance
- Large max_distance values may slow processing
- Multiple neighbors can be found per feature
- Results include distance in dataset units
