geosilo

https://github.com/Query-farm/geosilo

A DuckDB extension for compact geometry encoding. Delta-encodes coordinates as scaled integers instead of float64 pairs, achieving 3–4x smaller geometry on disk and over the wire compared to standard WKB. Points compress to just 9 bytes (vs 21 bytes WKB).

GeoSilo provides a first-class GEOSILO column type with transparent interop — standard ST_* spatial functions work directly on GEOSILO columns, with high-performance native implementations for common operations that skip the WKB decode step entirely.