Actually JTS implements this correctly. The return value from
getDimension is computed by the implementation of CoordinateSequence.
In the case of DefaultCoordinateSequence (which by the way is deprecated
and replaced by CoordinateArraySequence) the value is alway 3, since the
Coordinate representation used by these sequences always allows for 3
ordinates.
In the case of PackedCoordinateSequence the dimension can be selected on
creation, and this is the value that is returned by getDimension.
Sanak wrote:
Hi list,
I don't know that this is a known bug, but
CoordinateArraySequence.getDimension() method always return 3.
[trunk/source/headers/geos/geom/CoordinateArraySequence.h - line 88]
size_t getDimension() const { return 3; }
JTS(JTS Topology Suite) seems to be also the same.
[jts/src/com/vividsolutions/jts/geom/DefaultCoordinateSequence.java -
line 95]
public int getDimension() { return 3; }
I don't know that this is a specification or not...
Regards,
Sanak.
2009/1/12 Sean Gillies <sgill...@frii.com <mailto:sgill...@frii.com>>
I'm finding that GEOSCoordSeq_getDimensions returns 3 no matter what
# Accessing libgeos_c via Python ctypes
>>> s = lgeos.GEOSCoordSeq_create(2, 2)
>>> ndim = c_int()
>>> lgeos.GEOSCoordSeq_getDimensions(s, byref(ndim))
1
>>> ndim
c_long(3)
Is this a known bug? Looks like we're only testing creation of 3D
coordinate sequences in
http://trac.osgeo.org/geos/browser/trunk/tests/unit/capi/GEOSCoordSeqTest.cpp
--
Sean Gillies
http://sgillies.net
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Refractions Research, Inc.
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