CoMapeo Geometry Encoding

GeoJSON geometry encoding and decoding to/from protobufs for CoMapeo.

This repo contains a protobuf definition and encoding/decoding functions for a subset GeoJSON geometry objects. It is used by the CoMapeo project to encode and decode geometries.

• Encoding Format

Encoding Format

The encoding format is inspired by Geobuf, with some changes which prioritize simplicity over optimization and compactness:

• Coordinates are encoding as double in original precision instead of Geobuf's sint64 and rounded to 6 decimal places.
• For polygons and multipolygons, the last position is repeated in the encoded protobuf. Geobuf optimizes storage by skipping the repeated last position.
• Only supports Geometry objects, not Feature objects.

The subset of GeoJSON geometries supported are:

• Only Point, LineString, MultiLineString, Polygon, MultiPoint and MultiPolygon are supported.
• Only 2D positions (coordinates) are supported.
• No support for bbox.

Future versions may support more geometry types and 3D positions.