geojson-kt is a native Kotlin library for working with GeoJSON data that aims to fully support RFC 7946.
In addition, it includes functions for some common spatial calculations, e.g., calculating the centroid of a polygon.
- Almost full RFC 7946 support (see table below)
- All geometry types have been implemented.
- Validation is incomplete in some cases (e.g., when geometry crosses the antimeridian)
- Serialization of all GeoJSON types via Jackson.
- Common spatial calculations:
- Polygon centroid calculation
- PIP (point-in-polygon) check
- Determining if two polygons intersect
| RFC Section | Type / Feature | Supported? | Notes |
|---|---|---|---|
| 3.1 | Geometry Object | ✅ | Abstract Geometry class is provided. |
| 3.1.1 | Position | ✅ | |
| 3.1.2 | Point | ✅ | |
| 3.1.3 | MultiPoint | ✅ | |
| 3.1.4 | LineString | ✅ | |
| 3.1.5 | MultiLineString | ✅ | |
| 3.1.6 | Polygon | ✅ | |
| 3.1.7 | MultiPolygon | ✅ | |
| 3.1.8 | GeometryCollection | ✅ | |
| 3.1.9 | Antimeridian Cutting | ❌ | Support should be added for all geometry types (not required). |
| 3.1.10 | Uncertainty and Precision | ✅ | No assumptions about the certainty of coordinate positions are made based on precision. |
| 3.2 | Feature Object | ✅ | |
| 3.3 | Feature Collection | ✅ | |
| 4 | Coordinate Reference System | ✅ | All coordinates are assumed to be in WGS 84 format. |
| 5 | Bounding Box | ❗️ | Can be automatically calculated from geometry. Point-order validation is missing. |
| 5.1 | The Connecting Lines | ✅ | |
| 5.2 | The Antimeridian | ❌ | Validation needs to be added. |
| 5.3 | The Poles | ❌ | Validation needs to be added. |
| 5 | Bounding Box | ✅ | Can be automatically calculated from geometry. |
| 6 | Extending GeoJSON | ✅ | |
| 6.1 | Extending GeoJSON | ✅ | Additional properties are supported for Features only. |
| 7 | GeoJSON Types Are Not Extensible | ✅ | |
| 7.1 | Semantics of GeoJSON Members and Types Are Not Changeable | ✅ |
To get started, please take a look at CONTRIBUTING.md.
We ask that all contributors review and agree to adhere to our code of conduct prior to contributing.
- Please see CODE_OF_CONDUCT.md for details.
Copyright 2024 - 2025 LY Corporation
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