[postgis-users] Getting TopologyExections when trying to node linestrings to create an overlay

BladeOfLight16 bladeoflight16 at gmail.com
Mon Feb 9 02:37:55 PST 2015

On Sun, Feb 8, 2015 at 9:31 PM, John Abraham <jea at hbaspecto.com> wrote:

> Well I could say that using PostGIS ST_Intersects with "messy data" always
> seems to give me TopologyExceptions.  I've had luck with various
> combinations of ST_SnapToGrid and ST_Buffer(0), but with messy data there
> always seems to be some weird case that requires manually edits.  Sorry to
> be the bearer of bad news.  Frankly, I don't understand why the GEOS
> library has to throw that error.
> I would encourage you to isolate particular problems and file bug
> reports.  Improvements in GEOS to eliminate the underlying error(s) would
> certainly be welcome.

That's pretty much what my e-mail does; it even includes a sample database
to reproduce the issue. I brought it up here in case some discussion or
slimming down needed/could be done before filing a bug report, and to be
extra sure that it's a GEOS issue and not a PostGIS once, given the
complexity of the query I'm running.
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