[postgis-users] Negative buffer chokes on Alaska

Martin Davis mbdavis at refractions.net
Mon Jun 23 08:56:44 PDT 2008

FWIW - in JTS this data checks out as valid, and both buffers work fine
(and in reasonable time).

Sean Fulton wrote:
> I have Census congressional district data loaded in a Postgis db. I
> want to do a negative buffer on all of the districts. The data is in
> US National Atlas (EPSG:2163).
> Whenever I try to do a large (~10,000 m) buffer postgresql crashes. I
> eventually figured out that Alaska was causing the problem. Reducing
> the buffer gives unusual results for Alaska. A -500m buffer produces
> the image attached (blue = buffer result, green = original data).

Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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