[geos-devel] [GEOS] #676: WKT reader interprets M coordinate as Z

[GEOS]

#676: WKT reader interprets M coordinate as Z
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 Reporter:  mwtoews     |       Owner:  geos-devel@…              
     Type:  defect      |      Status:  new                       
 Priority:  major       |   Milestone:  3.5.0                     
Component:  Default     |     Version:  3.4.2                     
 Severity:  Unassigned  |    Keywords:                            
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 With an older-style WKT string with 3 dimensions (e.g., 'POINT (1 2 3)'),
 the obvious interpretation is to map the dimensions: X, Y, Z.

 However, with a newer-style WKT string with 3 dimensions, the data still
 get mapped to dimensions: X, Y, Z. Even for 'POINT M(1 2 3)', which should
 be interpreted by GEOS as 'POINT (1 2)', since there isn't any Z
 dimension.

 The inconsistency is pointed out by the WKB reader, which correctly reads
 'POINT M(1 2 3)' as
 0101000040000000000000F03F00000000000000400000000000000840 (from PostGIS)
 which does not have a Z dimension, and is written by WKTReader correctly
 as 'POINT (1 2)'.

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Ticket URL: <http://trac.osgeo.org/geos/ticket/676>
GEOS <http://geos.refractions.net/>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).