@comapeo/geometry
v1.0.2
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GeoJSON Geometry encoding and decoding to protobuf
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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
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'ssint64
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
,Polygon
,MultiPoint
andMultiPolygon
are supported. - Only 2D positions (coordinates) are supported.
- No support for
bbox
.
Future versions may support more geometry types and 3D positions.