ST_Simplify for geography
|Reported by:||Mike Taves||Owned by:||pramsey|
|Priority:||medium||Milestone:||PostGIS Fund Me|
Currently, ST_Simplify works only on geometries in 2D Cartesian space. Simplifying geography objects is only possible by projecting into an appropriate spatial reference system (i.e. _ST_BestSRID), then back to geography.
A recently published article "Robust line simplification on the surface of the sphere" by José Luis García Pallero (2015) describes a possible technique, which is implemented in C, with an Apache License 2.0. Inline comments are in Spanish. Additional speed is gained from an optional OpenMP implementation. The adaptation to work on the sphere is based on previous work "Robust line simplification on the plane" (2013).