--- a/flys-artifacts/ChangeLog	Wed Nov 16 14:47:02 2011 +0000
+++ b/flys-artifacts/ChangeLog	Wed Nov 16 14:50:19 2011 +0000
@@ -1,3 +1,9 @@
+2011-11-16  Felix Wolfsteller <felix.wolfsteller@intevation.de>
+
+	* src/main/java/de/intevation/flys/artifacts/WQKmsInterpolArtifact.java:
+	  Added functionality to artifact to use single column wst
+	  interpolators.
+
 2011-11-16  Felix Wolfsteller <felix.wolfsteller@intevation.de>
 
 	* src/main/java/de/intevation/flys/artifacts/model/WstValueTableFactory.java:

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/WQKmsInterpolArtifact.java	Wed Nov 16 14:47:02 2011 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/WQKmsInterpolArtifact.java	Wed Nov 16 14:50:19 2011 +0000
@@ -91,12 +91,20 @@
 
             if (parts.length >= 4) {
                 int wst = Integer.valueOf(parts[3]);
-                /* @TODO For certain datasets it might be necessary to
-                 * restrict on a single column of wsts. */
-                //    int col = Integer.valueOf(parts[2]);
-                //addStringData("col_pos", parts[2]);
+                int col = -1;
+                String colpos = parts[2];
+                // Are we interested in a single column or in all columns?
+                if (colpos.equals("A")) {
+                    ; // Take all.
+                }
+                else {
+                    col = Integer.valueOf(colpos);
+                    addStringData("col_pos", parts[2]);
+                }
                 addStringData("wst_id",  parts[3]);
-                String wkmsName = WKmsFactory.getWKmsName(wst);
+                String wkmsName = (col > 0)
+                                ? WKmsFactory.getWKmsName(col, wst)
+                                : WKmsFactory.getWKmsName(wst);
                 Facet facet = new WQFacet(
                     Resources.getMsg(
                         callMeta,
@@ -167,11 +175,17 @@
      * Get WQ at a given km.
      */
     public double [][] getWQAtKm(double km) {
+
+        WstValueTable interpolator = null;
         // Get WstValueTable
-        WstValueTable interpolator = WstValueTableFactory.getTable(
-            getDataAsInt("wst_id"));
-        // @TODO we might have to give column position for certain datasets.
-        //            getDataAsInt("col_pos"));
+        if (getDataAsString("col_pos") != null) {
+            interpolator = WstValueTableFactory.getWstColumnTable(
+                getDataAsInt("wst_id"), getDataAsInt("col_pos"));
+        }
+        else {
+            interpolator = WstValueTableFactory.getTable(
+                getDataAsInt("wst_id"));
+        }
 
         double [][] vs = interpolator.interpolateWQColumnwise(
             getDataAsDouble("ld_locations"));