[postgis-users] TopologyException: no outgoing dirEdge found

[Andreas Laggner]

Hi,

does someone know what´s behind this Error?
NOTICE: TopologyException: no outgoing dirEdge found 
(3.5888e+006,5.82215e+006)
ERROR: GEOS union() threw an error!

I tried the functions Intersection() and Union() with different datasets 
from differnet regions (65 to 6000 polygons) in many combinations and i 
always get this error (even if the data isvalid and issimple). With 
google search i found some hints: Maybe to high precision is the reason 
for this???
I want to intersect whole germany with postgis and i did not realize a 
small municipality so far! I tried WinXP with PostgreSQL8.1 and Linux 
with PostgreSQL8.2 (new installation with highest version of postgis 
available).

My SQL statements:
create table intersect_gf2(gid integer) with oids;
select 
addgeometrycolumn('','intersect_gf2','the_geom','31467','MULTIPOLYGON',2);
insert into intersect_gf2 select t1.gid,geomunion(t1.the_geom, 
t2.the_geom) from gf_veg1 t1, gf_corine t2;
insert into intersect_gf2 select t1.gid,intersection(t1.the_geom, 
t2.the_geom) from gf_buk t1, gf_veg2 t2;

hasta luego Andreas