Inconsistent results with SDO_RELATE and boundary conditions

Question

Hello,
I am using SDO_RELATE to find all points in one table with any interaction with a polygon selected from a second table. Pretty basic stuff. I noticed one point which exactly matches a vertex on the query polygon was not getting selected as expected. Experimenting a bit I found if I embedded the polygon geometry in the query (rather than selecting it from its table) the query selected the point in question! Experimenting further I found if I changed the query relation from ANYINTERACT to TOUCH the point in question was not selected. So my 2 questions are:
1) What would cause this to fail when the query polygon is being selected from the table?
2) How can ANYINTERACT be true but TOUCH be false?
Here is the first query that fails:
SELECT a.point_id
FROM point_table a, poly_table b
WHERE a.point_id = <point which matches poly vertex>
AND b.poly_id = <poly_id>
AND SDO_RELATE (a.geom, b.geom, 'mask=ANYINTERACT querytype=WINDOW') = 'TRUE';
Here is the query that works:
SELECT a.point_id
FROM point_table a, poly_table b
WHERE a.point_id = <point which matches poly vertex>
AND SDO_RELATE (a.geom,
MDSYS.SDO_GEOMETRY(2003, 8265, NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1, 1003, 1),
MDSYS.SDO_ORDINATE_ARRAY(-82.414884, 28.0094323,
-82.387158, 28.0116258, -82.378891, 28.0131216,
-82.377988, 28.0133894, -82.37555, 28.0143994,
-82.329352, 28.0661089, -82.313207, 28.1006725,
-82.362246, 28.1261981, -82.445319, 28.1139363,
-82.428389, 28.0245891, -82.422103, 28.0117697,
-82.421382, 28.0109085, -82.419096, 28.0099741,
-82.414884, 28.0094323)),
'mask=ANYINTERACT querytype=WINDOW') = 'TRUE';
Here is the second query that fails (ANYINTERACT -> TOUCH):
SELECT a.point_id
FROM point_table a, poly_table b
WHERE a.point_id = <point which matches poly vertex>
AND SDO_RELATE (a.geom,
MDSYS.SDO_GEOMETRY(1003, 8265, NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1, 2003, 1),
MDSYS.SDO_ORDINATE_ARRAY(-82.414884, 28.0094323,
-82.387158, 28.0116258, -82.378891, 28.0131216,
-82.377988, 28.0133894, -82.37555, 28.0143994,
-82.329352, 28.0661089, -82.313207, 28.1006725,
-82.362246, 28.1261981, -82.445319, 28.1139363,
-82.428389, 28.0245891, -82.422103, 28.0117697,
-82.421382, 28.0109085, -82.419096, 28.0099741,
-82.414884, 28.0094323)),
'mask=TOUCH querytype=WINDOW') = 'TRUE';
The point geometry being selected from the point_table looks like this:
MDSYS.SDO_GEOMETRY(2001, 8265, NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1, 1, 1),
MDSYS.SDO_ORDINATE_ARRAY(-82.445319, 28.1139363))
The metadata for these 2 tables looks like this:
POINT_TABLE
GEOM
SDO_DIM_ARRAY(SDO_DIM_ELEMENT('X', -180, 180, .05),
SDO_DIM_ELEMENT('Y', -90, 90, .05))
8265
POLY_TABLE
GEOM
SDO_DIM_ARRAY(SDO_DIM_ELEMENT('X', -180, 180, .05),
SDO_DIM_ELEMENT('Y', -90, 90, .05))
8265
Both tables have R-tree indexes built.
System is Oracle9i Enterprise Edition Release 9.2.0.5.0 with sdo_version = 9.2.0.5.0
Is it a problem that my points are stored as SDO_ORDINATES? Is the tolerance a factor? Is geodetic data a factor?
Let me know if any other information would be useful and thank you for your help!
James

Answer 1

I am continuing to struggle with this one. I gave up on the SDO_RELATE function under the assumption the tolerance does not come into play for this function (is this true?).
Now I am trying to use the SDO_GEOM.RELATE function with a tolerance to make this work and it is not working as I would expect.
The following 2 queries show the distance between this point and this polygon is 0 yet they are disjoint. How can this be??
Thanks, James
SQL> SELECT SDO_GEOM.SDO_DISTANCE(
2 MDSYS.SDO_GEOMETRY(2001, 8265, NULL,
3 MDSYS.SDO_ELEM_INFO_ARRAY(1, 1, 1),
4 MDSYS.SDO_ORDINATE_ARRAY(-82.445319, 28.1139363)),
5 MDSYS.SDO_GEOMETRY(2003, 8265, NULL,
6 MDSYS.SDO_ELEM_INFO_ARRAY(1, 1003, 1),
7 MDSYS.SDO_ORDINATE_ARRAY(-82.414884, 28.0094323, -82.387158, 28.0116258,
8 -82.378891, 28.0131216, -82.377988, 28.0133894, -82.37555, 28.0143994,
9 -82.329352, 28.0661089, -82.313207, 28.1006725, -82.362246, 28.1261981,
10 -82.4453185022412,28.1139363297581, -82.428389, 28.0245891, -82.422103, 28.0117697,
11 -82.421382, 28.0109085, -82.419096, 28.0099741, -82.414884, 28.0094323)),
12 10)
13 FROM DUAL;
SDO_GEOM.SDO_DISTANCE(MDSYS.SDO_GEOMETRY(2001,8265,NULL,MDSYS.SDO_ELEM_INFO_ARRA
.00000000000000000000
SQL>
SQL> SELECT SDO_GEOM.RELATE(
2 MDSYS.SDO_GEOMETRY(2001, 8265, NULL,
3 MDSYS.SDO_ELEM_INFO_ARRAY(1, 1, 1),
4 MDSYS.SDO_ORDINATE_ARRAY(-82.445319, 28.1139363)),
5 'determine',
6 MDSYS.SDO_GEOMETRY(2003, 8265, NULL,
7 MDSYS.SDO_ELEM_INFO_ARRAY(1, 1003, 1),
8 MDSYS.SDO_ORDINATE_ARRAY(-82.414884, 28.0094323, -82.387158, 28.0116258,
9 -82.378891, 28.0131216,-82.377988, 28.0133894, -82.37555, 28.0143994,
10 -82.329352, 28.0661089, -82.313207, 28.1006725,
11 -82.362246, 28.1261981, -82.4453185022412, 28.1139363297581,
12 -82.428389, 28.0245891, -82.422103, 28.0117697,
13 -82.421382, 28.0109085, -82.419096, 28.0099741, -82.414884, 28.0094323)),
14 10)
15 FROM DUAL;
SDO_GEOM.RELATE(MDSYS.SDO_GEOMETRY(2001,8265,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,1,
DISJOINT