[postgis-users] polygonize and other geometry constructors

[Pericles S. Nacionales]

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?

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.

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