--- a/pkg/imports/isr.go	Sun Oct 06 11:12:32 2019 +0200
+++ b/pkg/imports/isr.go	Sun Oct 06 11:41:31 2019 +0200
@@ -44,10 +44,7 @@
 }
 
 func (isrJobCreator) Depends() [2][]string {
-	return [2][]string{
-		{"sounding_results", "sounding_results_contour_lines"},
-		{},
-	}
+	return srJobCreator{}.Depends()
 }
 
 const (
@@ -60,6 +57,10 @@
 DELETE FROM waterway.sounding_results_contour_lines
 WHERE sounding_result_id = $1
 `
+	deleteIsoAreasSQL = `
+DELETE FROM waterway.sounding_results_iso_areas
+WHERE sounding_result_id = $1
+`
 )
 
 func (isr *IsoRefresh) CleanUp() error { return nil }
@@ -166,10 +167,17 @@
 	}
 	defer tx.Rollback()
 
-	insertStmt, err := tx.Prepare(insertContourSQL)
+	insertContoursStmt, err := tx.Prepare(insertContourSQL)
 	if err != nil {
 		return err
 	}
+	defer insertContoursStmt.Close()
+
+	insertAreasStmt, err := tx.Prepare(insertIsoAreasSQL)
+	if err != nil {
+		return err
+	}
+	defer insertAreasStmt.Close()
 
 	// For all sounding results in bottleneck.
 	for _, sr := range bn.srs {
@@ -185,9 +193,14 @@
 			return err
 		}
 
+		// Delete the old iso areas.
+		if _, err := tx.ExecContext(ctx, deleteIsoAreasSQL, sr); err != nil {
+			return err
+		}
+
 		octree.DoContours(tree, hs, func(res *octree.ContourResult) {
 			if err == nil && len(res.Lines) > 0 {
-				_, err = insertStmt.ExecContext(
+				_, err = insertContoursStmt.ExecContext(
 					ctx,
 					sr, res.Height, tree.EPSG,
 					res.Lines.AsWKB2D(),
@@ -197,6 +210,22 @@
 		if err != nil {
 			return err
 		}
+
+		// Calculate and store the iso areas.
+		areas := tree.TraceAreas(hs, isoCellSize)
+		for i, a := range areas {
+			if len(a) == 0 {
+				continue
+			}
+			if _, err := insertAreasStmt.ExecContext(
+				ctx,
+				sr, hs[i], tree.EPSG,
+				a.AsWKB(),
+				contourTolerance,
+			); err != nil {
+				return err
+			}
+		}
 	}
 
 	return tx.Commit()