The GEOS team is pleased to announce that GEOS 3.1.0 has been pushed out the door, cold, wet, trembling and looking for love.Thanks everyone on the GEOS team for the work over this cycle!http://download.osgeo.org/geos/geos-3.1.0.tar.bz2
Version 3.1.0 includes a number of improvements over the 3.0 version:
- PreparedGeometry operations for very fast predicate testing.
- Intersects()
- Covers()
- CoveredBy()
- ContainsProperly()
- Easier builds under MSVC and OpenSolaris
- Thread-safe CAPI option
- IsValidReason added to CAPI
- CascadedUnion operation for fast unions of geometry sets
- Single-sided buffering operation added
- Numerous bug fixes.
Users of the upcoming PostGIS 1.4 will find that compiling against GEOS 3.1 provides them access to some substantial performance improvements and some extra functions.
Wednesday, March 18, 2009
GEOS 3.1.0
We completed the 3.1.0 release cycle today! Here's the announcement:
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5 comments:
Great news! One note though -- it looks like the buffering speedups from JTS aren't in this build -- can you confirm that?
I can confirm that, sadly, there are a number of JTS changes -- buffer speed, buffer reliability, internal snapping -- that are missing from this release.
So what does ContainsProperly do exactly? and when would you use it instead of Contains? Inquiring minds want to know.
A.ContainsProperly(B) if B intersects the interior of A but not the boundary (or exterior).
Okay I guess we'll need to make clearer the documentation of ST_Contains -- because its still not clear and we can document ST_Containsproperly correct? I'll steal Martin's contains definition from
http://lin-ear-th-inking.blogspot.com/2007/06/subtleties-of-ogc-covers-spatial.html
Geometry A contains Geometry B iff no points of B lie in the exterior of A, and at least one point of the interior of B lies in the interior of A.
So I guess the big take home lesson I am looking for is that
ST_Contains(A,A) = true
But
ST_ContainsProperly(A,A) = false
but neither Contains nor ContainsProperly in case of contain their boundaries.
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