[postgis-users] bounding box incorrect on circularstring

[Ken Southerland]

I am using Postgres 8.2.4 on Windows and am having an issue with the 
Circular Strings in the Postgis extension.

Why is the bounding box of circularstrings incorrectly calculated.  Here 
I have a circular string that represents a nearly closed circle...

db=# SELECT astext( geom ) FROM geom_table WHERE id = 0;

---------------------------------------
  CIRCULARSTRING(220268.439465645 150415.359530563,220227.333322076 
150505.561285
879,220227.353105332 150406.434743975)


... but it's extent is a rectangle that only covers the two endpoints 
and ignores the middle point and the arc segments in-between...

db=# SELECT astext( extent( geom ) ) FROM geom_table WHERE id = 0;
 
---------------------------------------------------------------
  POLYGON((220227.34375 150406.421875,220227.34375 
150415.375,220268.453125 15041
5.375,220268.453125 150406.421875,220227.34375 150406.421875))

... is this a known issue that is being addressed?

Ken

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Ken Southerland
Senior Consultant
Sam Six, Inc.

503-358-6542
http://www.samsix.com