Hello
I am trying to aggregate linestrings together based on their attributes and
the fact that they are touching each other.
Therefore I found out how to write a very basic aggregate function :
CREATE AGGREGATE geometry_sum (
SFUNC = st_union,
BASETYPE = geometry,
STYPE = geometry);
I can now aggregate my linestrings grouped by their names, importance, and
so on but . I have trouble to group them by the fact that they are touching
each other.
e.g.
linestring A, B and C have the same attributes but only A and B are touching
each other.
I would like as a result A+B in one record, and C in a second record.
Does someone have any tips to share ?
Thank you,
Nicolas
_______________________________________________
postgis-users mailing list
[email protected]
http://postgis.refractions.net/mailman/listinfo/postgis-users
