Almost. #1 & 3 are correct. But #2 is not, according to the OGC SFS.
Technically, the SFS uses the "mod-2" rule for deciding when boundary
points of component curves (the endpoints) are also boundary points of
the parent MultiCurve. An endpoint of a component Curve is only in the
boundary if it occurs an odd number of times in the parent Geometry.
Graphically:
*----* is a LineString with 2 points in its boundary
*----o-----* is a MultiLineString with 2 component LineStrings. It also
has only two points in its boundary.
Anke Trittenbach wrote:
Hello all together,
i have a short question to the ISO-Geometries.
How do you think, the boundaries of Aggregates look like?
I think,
- the Boundary of a MultiPoint is null
- the Boundary of a MultiCurve is a Set of CurveBoundaries of all the single
elements of the MultiCurve
- the Boundary of a MultiSurface is a Set of SurfaceBoundaries of all the single elements of the
MultiSurface
Doyou agree? Or what do you think?
Thanks for your help.
--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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