From 6fe467366a81cc294164cdf3dc5100dcd01c1617 Mon Sep 17 00:00:00 2001
From: abelvm <abel@cartodb.com>
Date: Thu, 18 Aug 2016 09:31:08 -0400
Subject: [PATCH] removed spurious segments

---
 src/pg/sql/09_voronoi.sql | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/pg/sql/09_voronoi.sql b/src/pg/sql/09_voronoi.sql
index 20de189..eb5921b 100644
--- a/src/pg/sql/09_voronoi.sql
+++ b/src/pg/sql/09_voronoi.sql
@@ -25,7 +25,7 @@ BEGIN
     convexhull_1 as (
         SELECT
             ST_ConvexHull(ST_Collect(geomin)) as g,
-            buffer * |/ st_area(ST_ConvexHull(ST_Collect(geomin))) as r
+            buffer * |/ (st_area(ST_ConvexHull(ST_Collect(geomin)))/PI()) as r
     ),
     clipper as(
         SELECT
@@ -153,7 +153,8 @@ BEGIN
     INTO geomout
     FROM
         voro_set v,
-        clipper c;
+        clipper c
+    WHERE ST_GeometryType(v.g) = 'ST_Polygon';
     RETURN geomout;
 END;
 $$ language plpgsql IMMUTABLE;