Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingChartDataFactory.cs
===================================================================
diff -u -re62502b93eb5144e00dcba97a69b6c6088b99656 -rfd3f53993a2113c76da7d305a0e80621605bfe3f
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingChartDataFactory.cs	(.../PipingChartDataFactory.cs)	(revision e62502b93eb5144e00dcba97a69b6c6088b99656)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingChartDataFactory.cs	(.../PipingChartDataFactory.cs)	(revision fd3f53993a2113c76da7d305a0e80621605bfe3f)
@@ -29,7 +29,6 @@
 using Core.Common.Geometry;
 using Core.Components.Charting.Data;
 using Core.Components.Charting.Styles;
-using Ringtoets.Common.Forms.Views;
 using Ringtoets.Piping.Forms.Properties;
 using Ringtoets.Piping.Primitives;
 using PipingDataResources = Ringtoets.Piping.Data.Properties.Resources;
@@ -357,20 +356,13 @@
 
         private static ChartData CreateLocalPoint(Point3D worldPoint, RingtoetsPipingSurfaceLine surfaceLine, string name, ChartPointStyle style)
         {
-            Point2D firstPoint = Point3DToPoint2D(surfaceLine.Points.First());
-            Point2D lastPoint = Point3DToPoint2D(surfaceLine.Points.Last());
             return new ChartPointData(new[]
             {
-                worldPoint.ProjectIntoLocalCoordinates(firstPoint, lastPoint)
+                surfaceLine.GetLocalPointFromGeometry(worldPoint)
             }, name)
             {
                 Style = style
             };
         }
-
-        private static Point2D Point3DToPoint2D(Point3D point3D)
-        {
-            return new Point2D(point3D.X, point3D.Y);
-        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs
===================================================================
diff -u -r4e49e3da1fa385207c70c8cc28ed04cda530bc61 -rfd3f53993a2113c76da7d305a0e80621605bfe3f
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs	(.../PipingSurfaceLinesCsvImporter.cs)	(revision 4e49e3da1fa385207c70c8cc28ed04cda530bc61)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs	(.../PipingSurfaceLinesCsvImporter.cs)	(revision fd3f53993a2113c76da7d305a0e80621605bfe3f)
@@ -209,12 +209,8 @@
                 return true;
             }
 
-            var firstPoint = readSurfaceLine.Points.First();
-            var lastPoint = readSurfaceLine.Points.Last();
-            var firstLocalPoint = new Point2D(firstPoint.X, firstPoint.Y);
-            var lastLocalPoint = new Point2D(lastPoint.X, lastPoint.Y);
-            var localDikeToeAtRiver = characteristicPoints.DikeToeAtRiver.ProjectIntoLocalCoordinates(firstLocalPoint, lastLocalPoint);
-            var localDikeToeAtPolder = characteristicPoints.DikeToeAtPolder.ProjectIntoLocalCoordinates(firstLocalPoint, lastLocalPoint);
+            var localDikeToeAtRiver = readSurfaceLine.GetLocalPointFromGeometry(characteristicPoints.DikeToeAtRiver);
+            var localDikeToeAtPolder = readSurfaceLine.GetLocalPointFromGeometry(characteristicPoints.DikeToeAtPolder);
 
             if (localDikeToeAtPolder.X <= localDikeToeAtRiver.X)
             {
Index: Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs
===================================================================
diff -u -r619da07034480d4ba9e59fe0bea2dd06d83963e0 -rfd3f53993a2113c76da7d305a0e80621605bfe3f
--- Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision 619da07034480d4ba9e59fe0bea2dd06d83963e0)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision fd3f53993a2113c76da7d305a0e80621605bfe3f)
@@ -268,7 +268,7 @@
             }
 
             var segments = new Collection<Segment2D>();
-            for (int i = 1; i < localGeometry.Length; i++)
+            for (int i = 1; i < LocalGeometry.Length; i++)
             {
                 segments.Add(new Segment2D(LocalGeometry[i - 1], LocalGeometry[i]));
             }
@@ -329,6 +329,29 @@
             return !(firstLocalPoint.X > roundedLocalCoordinateL) && !(lastLocalPoint.X < roundedLocalCoordinateL);
         }
 
+        /// <summary>
+        /// Gets the local coordinate with rounded values based on the geometry of the surface line and the given world coordinate.
+        /// </summary>
+        /// <param name="worldCoordinate">The world coordinate to get the local coordinate for.</param>
+        /// <returns>The local coordinate.</returns>
+        public Point2D GetLocalPointFromGeometry(Point3D worldCoordinate)
+        {
+            var count = Points.Length;
+            if (count <= 1)
+            {
+                return new Point2D(double.NaN, double.NaN);
+            }
+
+            Point3D first = Points.First();
+            Point3D last = Points.Last();
+            Point2D firstPoint = new Point2D(first.X, first.Y);
+            Point2D lastPoint = new Point2D(last.X, last.Y);
+
+            Point2D localCoordinate = worldCoordinate.ProjectIntoLocalCoordinates(firstPoint, lastPoint);
+            return new Point2D(new RoundedDouble(numberOfDecimalPlaces, localCoordinate.X),
+                               new RoundedDouble(numberOfDecimalPlaces, localCoordinate.Y));
+        }
+
         public override string ToString()
         {
             return Name;
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineTest.cs
===================================================================
diff -u -r619da07034480d4ba9e59fe0bea2dd06d83963e0 -rfd3f53993a2113c76da7d305a0e80621605bfe3f
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineTest.cs	(.../RingtoetsPipingSurfaceLineTest.cs)	(revision 619da07034480d4ba9e59fe0bea2dd06d83963e0)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineTest.cs	(.../RingtoetsPipingSurfaceLineTest.cs)	(revision fd3f53993a2113c76da7d305a0e80621605bfe3f)
@@ -648,13 +648,6 @@
 
             // Assert
             Assert.IsFalse(valid);
-
-//            // Call
-//            TestDelegate call = () => surfaceLine.ValidateInRange((RoundedDouble) invalidValue, surfaceLine.ProjectGeometryToLZ().ToArray());
-//
-//            // Assert
-//            var expectedMessage = string.Format("Kan geen hoogte bepalen. De lokale coördinaat moet in het bereik [0, {0}] liggen.", 1.37);
-//            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call, expectedMessage);
         }
 
         [Test]
@@ -678,6 +671,58 @@
             Assert.IsTrue(valid);
         }
 
+        [Test]
+        public void GetLocalPointFromGeometry_ValidSurfaceLine_ReturnsLocalPoint()
+        {
+            // Setup
+            var testX = 1.0;
+            var testY = 2.2;
+            var testZ = 4.4;
+            Point3D testPoint = new Point3D(testX, testY, testZ);
+            RingtoetsPipingSurfaceLine surfaceLine = new RingtoetsPipingSurfaceLine();
+            CreateTestGeometry(testPoint, surfaceLine);
+
+            // Call
+            Point2D localPoint = surfaceLine.GetLocalPointFromGeometry(testPoint);
+
+            // Assert
+            Assert.AreEqual(new Point2D(0.04, 4.4), localPoint);
+        }
+
+        [Test]
+        public void GetLocalPointFromGeometry_NoPointsOnSurfaceLine_ReturnsPointWithNanValues()
+        {
+            // Setup
+            RingtoetsPipingSurfaceLine surfaceLine = new RingtoetsPipingSurfaceLine();
+
+            // Call
+            Point2D localPoint = surfaceLine.GetLocalPointFromGeometry(new Point3D(1.0, 2.2, 4.4));
+
+            // Assert
+            Assert.AreEqual(new Point2D(double.NaN, double.NaN), localPoint);
+        }
+
+        [Test]
+        public void GetLocalPointFromGeometry_OnePointOnSurfaceLine_ReturnsPointWithNanValues()
+        {
+            // Setup
+            var testX = 1.0;
+            var testY = 2.2;
+            var testZ = 4.4;
+            Point3D testPoint = new Point3D(testX, testY, testZ);
+            RingtoetsPipingSurfaceLine surfaceLine = new RingtoetsPipingSurfaceLine();
+            surfaceLine.SetGeometry(new[]
+            {
+                testPoint
+            });
+
+            // Call
+            Point2D localPoint = surfaceLine.GetLocalPointFromGeometry(testPoint);
+
+            // Assert
+            Assert.AreEqual(new Point2D(double.NaN, double.NaN), localPoint);
+        }
+
         private static void CreateTestGeometry(Point3D testPoint, RingtoetsPipingSurfaceLine surfaceLine)
         {
             var random = new Random(21);
Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingChartDataFactoryTest.cs
===================================================================
diff -u -re62502b93eb5144e00dcba97a69b6c6088b99656 -rfd3f53993a2113c76da7d305a0e80621605bfe3f
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingChartDataFactoryTest.cs	(.../PipingChartDataFactoryTest.cs)	(revision e62502b93eb5144e00dcba97a69b6c6088b99656)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingChartDataFactoryTest.cs	(.../PipingChartDataFactoryTest.cs)	(revision fd3f53993a2113c76da7d305a0e80621605bfe3f)
@@ -770,9 +770,10 @@
             Point2D firstPoint = new Point2D(first.X, first.Y);
             Point2D lastPoint = new Point2D(last.X, last.Y);
 
+            var localCoordinate = point.ProjectIntoLocalCoordinates(firstPoint, lastPoint);
             AssertEqualPointCollections(new[]
             {
-                point.ProjectIntoLocalCoordinates(firstPoint, lastPoint)
+                new Point2D(new RoundedDouble(2, localCoordinate.X), new RoundedDouble(2, localCoordinate.Y))
             }, chartPoints);
         }