Identifying rings and edges with problems

Question

Hi
I have new polygon layers that produce a validation error for a polygon of gtype of 2007:
13350 [Element <1>] [Rings 1, 8][Edge <9> in ring <1>][Edge <33> in ring <8>]
The error is:
ORA-13350: two or more rings of a complex polygon touch
Cause: The inner or outer rings of a complex polygon touch.
Action: All rings of a complex polygon must be disjoint. Correct the geometric definition of the object.
I can see the vertices using SDO_UTIL.GETVERTICES but I cannot find a way to identify where the Rings start. I assume Edges are the connecting lines between consecutive coordinates.
My questions are
1) Where is the documentation on where Rings start?
2) Is there an easy way to resolve this error? If I can find the ring docs, I can probably resolve the error by following the coordinates, but I am hoping for a clean tool to do this.
Thanks.
Roger

Answer 1

hi roger,
Are you patched all the way to 10.2.0.3? I noticed a bug in SDO_GEOM.SDO_UNION in 10.2.0.2 and below whereby if you try to UNION two polygons with a void in between and single touch point on one side of the void, the resulting polygon has the void still as a void rather than as a hole that touches the outer ring at a single point. This creates a 13350 error. Here is some lame ascii art you could view in courier new if I am not making sense. Its too bad we can't attach a little mspaint graphic to these posts. The problems is not present in 10.2.0.3.
| POLYGON A |
| ------------ |
| | VOID \|
-------------------+
| POLYGON B |
| UNIONED POLYGON |
| ------------ |
| | VOID \|
| --------------
| |
If anyone knows the bug number off the top of their heads, I'd like to know since I am using this issue to push everything to 10.2.0.3.
Cheers,
Paul