From: Bborie Park <bkpark at ucdavis.edu>
Date: Thu, 21 Mar 2013 21:28:05 +0000 (+0000)
Subject: Fix ST_InvDistWeigh4MA() to handle a situation when neighborhood is
X-Git-Tag: 2.1.0beta2~154
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=12926cc45af55e74406af49614f10ece26cc6941;p=postgis

Fix ST_InvDistWeigh4MA() to handle a situation when neighborhood is
empty except the center pixel.

git-svn-id: http://svn.osgeo.org/postgis/trunk@11194 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/raster/rt_pg/rtpostgis.sql.in b/raster/rt_pg/rtpostgis.sql.in
index 540f964dc..f3af59f72 100644
--- a/raster/rt_pg/rtpostgis.sql.in
+++ b/raster/rt_pg/rtpostgis.sql.in
@@ -3367,7 +3367,12 @@ CREATE OR REPLACE FUNCTION st_invdistweight4ma(value double precision[][][], pos
 
 		-- neighborhood is NODATA
 		IF z IS NULL OR array_length(z, 1) < 1 THEN
-			RETURN NULL;
+			-- center pixel has value
+			IF cv IS NOT NULL THEN
+				RETURN cv;
+			ELSE
+				RETURN NULL;
+			END IF;
 		END IF;
 
 		z0 := 0;