--- a/gnv-artifacts/ChangeLog	Mon Jan 25 17:06:01 2010 +0000
+++ b/gnv-artifacts/ChangeLog	Mon Jan 25 18:25:19 2010 +0000
@@ -1,3 +1,46 @@
+2010-01-25	Sascha L. Teichmann	<sascha.teichmann@intevation.de>
+
+	Fix/Workaround for gnv/issue159
+
+	* src/main/java/de/intevation/gnv/state/profile/horizontalcrosssection/HorizontalCrossSectionMeshOutputState.java,
+	  src/main/java/de/intevation/gnv/state/profile/verticalcrosssection/VerticalCrossSectionOutputState.java,
+	  src/main/java/de/intevation/gnv/state/profile/horizontal/HorizontalProfileMeshCrossOutputState.java:
+	  Deactivated the index buffer by default because applying it gives to
+	  less data points in some circumstances. When processing the 
+	  "horizontalen Schnittprofile", the "Profilschnitte" and the
+	  "Horizontalschnitte" the whole set of mesh cells for
+	  the given parameters are retrieved. This results in much
+	  more traffic from database (~ 10x) but seems not to be much slower.
+	  The memory consumption increases accordingly.
+
+	  To turn the index buffer on again use the boolean system properties:
+
+		  "gnv.horizontal.profile.mesh.cross.index.buffer"
+		  "gnv.vertical.cross.section.index.buffer"
+		  "gnv.horizontal.profile.mesh.cross.index.buffer"
+
+	* src/main/java/de/intevation/gnv/math/Interpolation2D.java: Because much
+	  more data is processed a more sophisticated point culling strategy is
+	  implemented now. 
+	  
+	  If the number of points are higher than a given threshold (system property 
+	  "gnv.interpolation2d.cull.point.threshold", default: 1000) a culling is 
+	  performed. Two cases:
+
+	  a) given a path P ("horizontales Schnittprofil", "Profilschnitt")
+	     Calculates a bounding box B for P and continues with (b).
+
+	  b) a bounding box B ("Horizontalschnitt", and above after (a))
+	     Calculates a bounding box C for the input points. If the
+		 area of B is greater than 80% of the area of C no culling is
+		 performed. Else B is extended by 10% in each direction.
+		 If the new area of B is smaller than 10% of the area of C
+		 B is adjusted to have at least 10% the size of C.
+
+	  All input points that are not inside B are culled. Afterwards the
+	  i/j grid cell units are created and pushed into a spatial index
+	  as described below.
+
 2010-01-25  Ingo Weinzierl <ingo.weinzierl@intevation.de>
 
 	  Issue157