# [postgis-users] Split Polygon Using Line

Robert Clift rob.clift at goisc.com
Tue Jul 8 08:11:58 PDT 2008

```Hi All:

I'm new to the list and, having learned GIS concepts using ESRI and
IDRISI products, I'm also new to PostgreSQL/PostGIS.

My first real challenge is to create a polygon representing an electric
service area from a verbal description of said area. I was told that the
service area encompasses the city limits as well as a small area on
either side of a highway_a (running north/south) up to the point that it
intersects highway_b (running east/west).  I buffered the shortest
section of highway_a that I was able to isolate, combined the resulting
polygon with the city limits polygon, then trimmed highway_b so that it
is only as long as the highway_a buffer is wide.  So what I'm left with
is a single polygon and a single short section of line.  I need to use
the line to split the polygon.  I thought this would be simple, but I am
flummoxed.  I came across the following sample at
http://postgis.refractions.net/support/wiki/index.php?SplitPolygonWithLi
neString
<http://postgis.refractions.net/support/wiki/index.php?SplitPolygonWithL
ineString> :

SELECT astext(geom ) FROM dump ((

SELECT polygonize(geomunion(boundary(poly), line)) AS mpoly FROM

(SELECT 'POLYGON ((1 1, 1 3, 3 3, 3 1, 1 1 ))'::geometry AS poly) AS
a,

(SELECT 'LINESTRING (0 2, 4 2)'::geometry AS line) AS b

));

So here is my query:

SELECT astext (geometry) FROM dump ((

SELECT polygonize (geomunion (boundary (mont_electric.the_geom),
jefferson_i10.the_geom)) AS mpoly FROM

(SELECT 'mont_electric ((-83.9124274522479
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30.4096900568807,-83.9116405206577 30.409728288933,-83.9118899003197
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30.4105808678289,-83.9126504284633 30.4108374350519,-83.9126640193565
30.4111017321207,-83.9124274522479 30.4161531930239))'::geometry AS
poly) AS a,

(SELECT 'jefferson_i10 (-83.8910804546697
30.4756948695607,-83.8883392746518 30.4751780144512)'::geometry AS line)
AS b

));

This query returns:

ERROR: parse error - invalid geometry

However, both of the following queries return a Boolean value of true:

SELECT isvalid (mont_electric.the_geom) FROM mont_electric;

SELECT isvalid (jefferson_i10.the_geom) FROM jefferson_i10;

I hope that this is a matter of a simple syntax error committed by a SQL
newbie.  Any help will be greatly appreciated.

Cheers,

Rob Clift

Florida State University, Department of Geography

I.S. Consulting (GIS Intern)

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