Hi,
I think that JTS does not have a MakeValid function that exists in PostGIS and
Spatialite but perhaps the buffer recipe works for you
http://stackoverflow.com/questions/4267956/how-to-repaire-a-polygon-with-self-intersection
-Jukka Rahkonen-
________________________________
bernhard schulenburg wrote:
Thanks Michael,
to clarify, by "complex" I mean a polygon that self-intersects.
as shown here:
http://commons.wikimedia.org/wiki/File:Complex_polygon.svg
And I would like to split this up into the minimal number of simple polygons
(simple = does not self-intersect..)
How would I do that programmatically?
2014-04-26 1:08 GMT+02:00 Michael Michaud
<[email protected]<mailto:[email protected]>>:
Hi Bernhard,
I'm new to the JTS Topology suite and couldn't figure out the steps to take..
Btw.. I hope this is the right list to ask questions about JTS.
There is also a more specific JTS list at
[email protected]<mailto:[email protected]>
but if you use JTS with OpenJUMP workbench this list is perfect
So, my problem is, I have a complex polygon and I would like to split it into
several simple polygons, using the JTS framework..
Through OpenJUMP UI, you must
- make your layer editable
- select the feature
- right click in the map and choose "explode selected features"
Programmatically, you can iterate through a geometry collection like this :
List<Geometry> geometries = new ArrayList<Geometry>();
for (int i = 0 ; i < geom.getNumGeometries() ; i++) {
geometries.add(geom.getGeometryN(i));
}
Does JTS allow that kind of operation? Which classes should I look at to do
such a thing?
Thanks in advance, any help is appreciated,
Hope that helps,
Michaël
Bernhard
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