I don't think this can be the problem - a buffer of a linestring should
still produce a polygon.
This is probably a bug in the GEOS buffer algorithm. It would help if
you posted the WKB or WKB for the geometry.
Chris Hermansen wrote:
This sounds to me like you might be buffering a linestring and not a
polygon. Is that possible? Ie are the countries represented as
outlines (linestrings) rather than polygons?
Roger André wrote:
Hi All,
I'm having some problems with features that are being returned from an
ST_Buffer operation in PostGIS. When I try to buffer the extents of
Papua New Guinea, a large region in the middle of its extents is
omitted. You can see a visual representation of this at
http://lagerratrobe.blogspot.com/2009/03/problem-with-postgis-stbuffer.html
If I just select the country itself, I get back all of the features
that I'm expecting. In the image I've posted above, the black area
indicates the results of that query.
I am using postgresql-8.3.5, and postgis-1.3.3. My select statements
is as follows:
select name, Buffer(the_geom, .12) from coastlines where
iso_3_code = 'PNG';
I've tried this using both a free countries shapefile, as well as an
ESRI one, and get the same results. I'm a bit baffled, and unsure if
I have a problem with both data sets, or in my query, or...? If
someone else has had a similar problem in the past, and can shed some
light on it, I'd greatly appreciate it.
Thanks in advance,
Roger
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Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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