--- a/flys-artifacts/ChangeLog	Thu Sep 27 11:54:10 2012 +0000
+++ b/flys-artifacts/ChangeLog	Thu Sep 27 12:58:55 2012 +0000
@@ -1,3 +1,10 @@
+2012-09-27	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
+
+	Fix issue863 (gaps in middle height bed data).
+
+	* src/main/java/de/intevation/flys/artifacts/model/MiddleBedHeightCalculation.java:
+	  Handle missing data.
+
 2012-09-27  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/wsplgen/FacetCreator.java: Set

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/MiddleBedHeightCalculation.java	Thu Sep 27 11:54:10 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/MiddleBedHeightCalculation.java	Thu Sep 27 12:58:55 2012 +0000
@@ -172,6 +172,7 @@
     }
 
 
+    /** Create MiddleBedHeightData to return. */
     protected MiddleBedHeightData prepareEpochData(
         BedHeightEpoch epoch,
         double kmLo,
@@ -193,7 +194,14 @@
 
         for (BedHeightEpochValue value: values) {
             data.addKM(value.getStation().doubleValue());
-            data.addMiddleHeight(value.getHeight().doubleValue());
+            if (value.getHeight() != null) {
+                data.addMiddleHeight(value.getHeight().doubleValue());
+                data.addIsEmpty(false);
+            }
+            else {
+                data.addMiddleHeight(Double.NaN);
+                data.addIsEmpty(true);
+            }
         }
 
         logger.debug("Epoch contains " + values.size() + " values");