[postgis-users] polygonize and other geometry constructors

[Pericles S. Nacionales]

Hey, thanks, Strk!  If had read the README, I would have known about the 
lwpostgis.sql.  

-Perry

On Friday 28 January 2005 10:14 am, strk at refractions.net wrote:
> On Fri, Jan 28, 2005 at 10:00:02AM -0600, Pericles S. Nacionales wrote:
> > Hi, I'm trying to make polygons out of point geometries and have a couple
> > of questions:
> >
> > 1. Does polygonize work on point geometries or just on lines?
>
> Should work with every geometry with dimension > 0 (all but points).
>
> > 2. How does the MakeLine and LineFromMultiPoint work?  I tried both on my
> > point geoms and both returns:
> > ERROR:  function linefrommultipoint(geometry) does not exist
> > HINT:  No function matches the given name and argument types. You may
> > need to add explicit type casts.
>
> Did you feed the lwpostgis.sql script to your database ?
> Or are you using some custom upgrade method ?
> The calls are correct.
>
> --strk;
>
> > I have PostGIS 1.0rc2 compiled with GEOS 2.1.1.   I can use the Collect
> > function to create mulipoint geoms from point geoms but the other
> > functions don't work for me.  What am I doing wrong?
> >
> > Here's are the statements I used for #2:
> > SELECT makeline(the_geom) FROM data WHERE squirrelid=702
> > SELECT linefrommultipoint(collect(the_geom)) FROM data WHERE
> > squirrelid=702
> >
> > While I'm at it, I might as well ask if there are any wildlife/population
> > ecology types out there who use PostGIS?  And if so, have you used
> > PostGIS to do homerange analysis stuff?
> >
> > Thanks,
> > Perry Nacionales
> >
> > --
> > Pericles S. Nacionales
> >
> > Dept. of Ecology, Evolution, and Behavior
> > University of Minnesota
> > work: 612 624 6713
> > e-mail: nacional at cbs.umn.edu
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>
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-- 
Pericles S. Nacionales

Dept. of Ecology, Evolution, and Behavior
University of Minnesota
work: 612 624 6713
e-mail: nacional at cbs.umn.edu