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List:       postgis-users
Subject:    [postgis-users] bounding box incorrect on circularstring
From:       Ken Southerland <southerland () samsix ! com>
Date:       2008-09-30 22:25:53
Message-ID: 48E2A771.6020505 () samsix ! com
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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

-- 
------s----a----m----s----i----x------
--

Ken Southerland
Senior Consultant
Sam Six, Inc.

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