No, actually buffer with a 0 radius means "the valid polygon which
contains only the points in the input geometry".
Since you can't create a valid polygon using a 0 radius to buffer a
non-polygon (line or point), buffer returns an empty geometry. In other
words, buffer(geom, 0) is only meaningful when geom is polygonal.
This should probably be clarified in the documentation.
ibrahim saricicek wrote:
hi all;
I think 0.0 of radius means the object itself? Am i wrong?
I'm inserting a row to my route table
insert into route (the_geom) select
st_transform(ST_GeomFromText('SRID=4326;multilinestring((30 20,31
21,32 22))'),900913)
why the result of this is false? that is a point on my route. what is
defined with '0.0 of radius'?
the result is true for 0.1 to 0.000000001? Why for 0.0000000001
radius, result is false?
select
st_intersects(st_buffer(route.the_geom,0.0), st_geomFromText('POINT(30
20)',4326))
as result
from route
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Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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