# Geospatial Search

## Purpose And Business Outcome

Support location-aware queries such as nearest-neighbor and bounding-box lookups for geospatial workloads.

## Scope And Non-Goals

Scope:
- Spatial index configuration
- Proximity and bounding-box query operations

Non-goals:
- Full GIS projection transformations
- External map tile services

## User And System Workflows

1. Consumer configures spatial index for coordinate fields.
2. Coordinates are serialized and stored with entity payloads.
3. Query path evaluates `Near` or `Within` predicates.
4. Engine returns matching entities.

## Interfaces And APIs

- Spatial index APIs in model configuration
- Query helpers under `GeoSpatialExtensions`
- Index implementation in `RTreeIndex`

## Permissions And Data Handling

- Geolocation data may be regulated or privacy-sensitive.
- Apply least-privilege access and retention limits.

## Dependencies And Failure Modes

Dependencies:
- Correct coordinate format and units
- Spatial index consistency

Failure modes:
- Invalid coordinate values
- Unexpected results from bounding definitions or radius units

## Monitoring, Alerts, And Troubleshooting

- Validate geospatial paths through dedicated stress and correctness tests.
- Use [`../runbook.md`](../runbook.md) for escalation.
- Follow [`../security.md`](../security.md) for geolocation data protection controls.
- Use [`../troubleshooting.md`](../troubleshooting.md#query-and-index-issues) for issue resolution.

## Rollout And Change Considerations

- Document coordinate and unit assumptions in release notes when behavior changes.
- Validate backward compatibility for persisted spatial index pages.

## Validation Guidance

- Run `GeospatialTests` and `GeospatialStressTests` before release.
- Include representative proximity/bounding queries in smoke checks.
