To All,
There doesn't seem to be an obvious answer to the problem given below (aka cleaning
polygons, creating planar polygons, etc). I did see a note on the PostGIS wiki wishlist
to "Add a geometry cleaner". There is also a suggestion to convert to
linestrings, node, then polygonize (while that may work for a small set of polygons, I've
got 1.1 million to clean). JTS, Geos, etc will likely fail due to the large number of
polygons so I'll need a different approach.
I'm considering writing some code to iterate through my table of polygons,
cleaning a small subset at a time. I think using PostGIS for the geometry
storage and spatial query/selection makes sense. Any suggestions on which API
to use?
GDAL's OGR
PostgreSQL's libpq
other?
Thanks!
Brent Fraser
Brent Fraser wrote:
PostGIS'ers,
I've got a table of overlapping polygons. How can I make it a table of
non-overlapping polygons?
For example, if table "polys2" contains two polygons A1 and B1 which
overlap. I'd like to create table "polys3" with polygons A2, B2, C2,
where C2 is the overlap region of A1 and B1, and A2 = A1 - C2, and B2 =
B1 - C2.
Looking at the overlay operations in the JTS doc it looks like doing an
Intersection (to get only the overlapping area) then adding the
Symmetric Difference (to get the non-overlapping areas) might work.
Am I on the right track or is there an easier way (since all the
polygons are in one table)?
Thanks!
Brent Fraser
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