[postgis-users] ST_Intersects on geography

[Paragon Corporation]

Hmm I didn't realize we use BOOM! in our errors, but I guess we do since I
get the same message in 2.0 and 1.5. :)
 
I know there are issues with the outer fringes when you get into the -180
... area which we have bug tickets in place for and patches not yet applied.
That could be one of them
try moving in a bit like 179.5 89 etc.
 
Unfortunately the guy who deals with these things is incognito at the moment

  _____  

From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Kidd,
David M
Sent: Monday, April 18, 2011 10:25 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] ST_Intersects on geography


Hi,
 
Applogies if the is a stupid newbie question.
 
I have am writing some some simple point in polygon searches on geographic
data using ST_Intersects, but have been getting some unexpected results;
 
Searching for a point in the southern hemisphere:
 
SELECT ST_Intersects('POINT(-160 -43)'::geography, 'POLYGON((-180 -90, -180
0, 180 0, 180 -90, -180 -90))'::geography) 
 
Returns f
 
Searching for a point in the northern hemisphere:
 
SELECT ST_Intersects('POINT(160 43)'::geography, 'POLYGON((0 0, 0 90, 180
90, 180 0, 0 0))'::geography)
 
ERROR:  BOOM! Could not generate outside point!
CONTEXT:  SQL function "st_intersects" statement 1
 
********** Error **********
 
ERROR: BOOM! Could not generate outside point!
SQL state: XX000
Context: SQL function "st_intersects" statement 1
This works though 
 
 
 
 
 

David M. Kidd

Research Associate
Center for Population Biology
Silwood Park Campus
Imperial College London
0207 594 2470

 
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