[postgis-users] Negative buffer chokes on Alaska

[Paul Ramsey]

Have you run as ST_IsValid test on it?

On Sun, Jun 22, 2008 at 7:47 PM, Sean Fulton <seanasy at gmail.com> 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).
>
> Postgis: POSTGIS="1.3.3" GEOS="3.0.0-CAPI-1.4.1" PROJ="Rel. 4.6.0, 21 Dec
> 2007" USE_STATS
> Original data: http://dpaste.com/58232/plain/
>
> Is it a problem with the data? With Postgis?
>
> Thanks in advance,
>
>        Sean
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