[postgis-users] POLYGON from LINESTRING

[Bernhard Reiter]

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On Thu, Apr 25, 2002 at 07:35:08AM -0700, Paul Ramsey wrote:
> Bernhard Reiter wrote:

> > On Wed, Apr 24, 2002 at 03:46:04PM -0700, Paul Ramsey wrote:
> > > No there is not a simple way. Type casting is not specified in SFSQL.

> My main concern is that if we do somethinglike that now,=20
> we open the door to creating incredibly invalid geometries.=20

It would be in the responsibility of the developer.
For sure there shouldn't be implicit type casting, this would be
bound to surprises.

> Ends touching is only one of the many criteria for a valid
> polygon, and until we have our topology library we cannot test for all
> the others. Imagine casting a figure 8 into a polygon. Ends touch, but
> it is definately invalid.

Are there provisions against bad INSERT statements for this?
If not, I do not see the chances of creating bad polygons raise.


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