PostGIS 2.0 Discussion Topics

• Serialization. GSERIALIZED structure. More things could be added: an optional hash code for fast identity checking on large objects; an optional user-data area where things like internal index trees could be serialized.
• Typmod implications.
• Changing the liblwgeom API
  • Modifiable pointarrays
  • GBOX as default bounding box
  • Documented and complete API for pointarray modification
  • Modifiable collections
  • Documented and complete API for collection modification
  • GEOS wrapper accessible from liblwgeom (moving down from postgis.so)
• Strategy for Curves
  • Uniform strategy for "implemented but not complete" types?
  • Plan for making curves more complete?
• Multi-dimensional indexing, what does the syntax and implementation look like?
• ​3D support for Polyhedral Surfaces, CityGML, Collada, X3D
  • implement in liblwgeom 3D primitives:
    • ST_IsValid
    • Point in Polyhedra test (and so others related 9DIM functions)
    • Polyhedra minimal distance (to a point also to an another polyhedra)
    • ST_Centroid
    • ST_Volume

• I/O functions
  • extensions to GML and KML
  • CityGML
  • Collada
  • X3D (yes please)

• Merging WKT Raster into PostGIS 2.0 codebase
• Switch to always use the GEOS C-API thread-safe interface (available since 3.1.0)

Migration Guide

Known issues with PostGIS 2.0 that will affect people upgrading from 1.5

• Dump and restore required, since disk serialization has changed
• WKB type numbers for CurvePolygon, MultiCurve and MultiSurface are now (10, 11, 12). In PostGIS 1.5 and below they were (13, 14, 15)
• SRID unknown will be 0 and not -1
• Functions removed:
  • List here…