Paul Tomblin wrote:
Bruce Rindahl wrote:
3. Is there any way to get the corners of a polygon or its bounding
box out
as separate points?
See the documentation on xmin, xmax, ymin, ymax
What documentation? In http://postgis.refractions.net/docs/ch06.html,
all I can find is "ST_xmin(box3d)". But experimentation shows I can
call 'xmin()' with a geometry, and 'st_xmin()' doesn't exist.
This is what I find so frustrating about the PostGIS documentation.
There are all these functions documented as "ST_*" but it turns out that
in order to use some of them, you actually have to leave off the "ST_"
part. This function is defined as requiring a box3d, but nothing I can
find in the docs actually comes out and says that if you have a method
that takes a box3d, you can call it with a geometry and it will use the
bounding box (ok, it does come out and say that for the && operator, but
it doesn't say it's true in general).
I'm really trying to read the manual before asking dumb questions, but
the manual is horrible.
Paul,
The manual reflects the current release or maybe svn trunk. I should
match the current downloadable version. It will be wrong for the earlier
versions. I would be nice if each vesion of the code that got released
had its own manual version so people code sync up the release version
that they might have on their whatever distribution to an appropriate
manual.
-Steve
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