Index: Core/Common/test/Core.Common.Base.Test/Data/RoundedPoint2DCollectionTest.cs
===================================================================
diff -u -r95072939afd1772892c79416dc2e9f747a8fe000 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Core/Common/test/Core.Common.Base.Test/Data/RoundedPoint2DCollectionTest.cs	(.../RoundedPoint2DCollectionTest.cs)	(revision 95072939afd1772892c79416dc2e9f747a8fe000)
+++ Core/Common/test/Core.Common.Base.Test/Data/RoundedPoint2DCollectionTest.cs	(.../RoundedPoint2DCollectionTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -51,7 +51,7 @@
                 new Point2D(4.63, 2.10),
                 new Point2D(6.74, 1.59),
             };
-            CollectionAssert.AreEqual(expectedPoints, collection.ToList());
+            CollectionAssert.AreEqual(expectedPoints, collection);
         }
 
         [Test]
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsInput.cs
===================================================================
diff -u -rba00ac482d95f158a6f51caec7b0de3d1e1ecc4c -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsInput.cs	(.../GrassCoverErosionInwardsInput.cs)	(revision ba00ac482d95f158a6f51caec7b0de3d1e1ecc4c)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsInput.cs	(.../GrassCoverErosionInwardsInput.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -106,13 +106,13 @@
         /// <summary>
         /// Gets the geometry of the foreshore.
         /// </summary>
-        public Point2D[] ForeshoreGeometry
+        public RoundedPoint2DCollection ForeshoreGeometry
         {
             get
             {
                 return dikeProfile != null
-                           ? dikeProfile.ForeshoreGeometry.ToArray()
-                           : new Point2D[0];
+                           ? dikeProfile.ForeshoreGeometry
+                           : new RoundedPoint2DCollection(2, Enumerable.Empty<Point2D>());
             }
         }
 
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/GrassCoverErosionInwardsInputContextForeshoreProperties.cs
===================================================================
diff -u -rb491d48a58b48c595ac55d80c1885137a585b331 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/GrassCoverErosionInwardsInputContextForeshoreProperties.cs	(.../GrassCoverErosionInwardsInputContextForeshoreProperties.cs)	(revision b491d48a58b48c595ac55d80c1885137a585b331)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/GrassCoverErosionInwardsInputContextForeshoreProperties.cs	(.../GrassCoverErosionInwardsInputContextForeshoreProperties.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System.ComponentModel;
+using System.Linq;
 using Core.Common.Base.Geometry;
 using Core.Common.Gui.Attributes;
 using Core.Common.Gui.Converters;
@@ -64,14 +65,14 @@
         {
             get
             {
-                return data.WrappedData.ForeshoreGeometry;
+                return data.WrappedData.ForeshoreGeometry.ToArray();
             }
         }
 
         [DynamicReadOnlyValidationMethod]
         public bool DynamicReadOnlyValidationMethod(string propertyName)
         {
-            return data.WrappedData.DikeProfile == null || data.WrappedData.ForeshoreGeometry.Length < 2;
+            return data.WrappedData.DikeProfile == null || data.WrappedData.ForeshoreGeometry.Count() < 2;
         }
 
         public override string ToString()
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/Views/GrassCoverErosionInwardsChartDataFactory.cs
===================================================================
diff -u -r4e9f27f907fa0cc1b78d41d0caba53b359d4c99c -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/Views/GrassCoverErosionInwardsChartDataFactory.cs	(.../GrassCoverErosionInwardsChartDataFactory.cs)	(revision 4e9f27f907fa0cc1b78d41d0caba53b359d4c99c)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/Views/GrassCoverErosionInwardsChartDataFactory.cs	(.../GrassCoverErosionInwardsChartDataFactory.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -73,7 +73,7 @@
         /// <returns><see cref="ChartData"/> based on the <paramref name="foreshoreGeometry"/>.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="foreshoreGeometry"/> 
         /// is <c>null</c>.</exception>
-        public static ChartData Create(Point2D[] foreshoreGeometry, string name)
+        public static ChartData Create(RoundedPoint2DCollection foreshoreGeometry, string name)
         {
             if (foreshoreGeometry == null)
             {
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/DikeProfileTest.cs
===================================================================
diff -u -r886c94611e3a5cc72a9e134a7fb02ba617fe7f38 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/DikeProfileTest.cs	(.../DikeProfileTest.cs)	(revision 886c94611e3a5cc72a9e134a7fb02ba617fe7f38)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/DikeProfileTest.cs	(.../DikeProfileTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -67,6 +67,7 @@
             CollectionAssert.AreEqual(foreshoreGeometry, dikeProfile.ForeshoreGeometry);
             Assert.AreEqual(0.0, dikeProfile.DikeHeight.Value);
             Assert.AreEqual(2, dikeProfile.DikeHeight.NumberOfDecimalPlaces);
+            Assert.AreEqual(2, dikeProfile.ForeshoreGeometry.NumberOfDecimalPlaces);
         }
 
         [Test]
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/Views/GrassCoverErosionInwardsChartDataFactoryTest.cs
===================================================================
diff -u -rba00ac482d95f158a6f51caec7b0de3d1e1ecc4c -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/Views/GrassCoverErosionInwardsChartDataFactoryTest.cs	(.../GrassCoverErosionInwardsChartDataFactoryTest.cs)	(revision ba00ac482d95f158a6f51caec7b0de3d1e1ecc4c)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/Views/GrassCoverErosionInwardsChartDataFactoryTest.cs	(.../GrassCoverErosionInwardsChartDataFactoryTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -78,7 +78,7 @@
         public void Create_DikeProfileForshoreGeometryNull_ThrowsArgumentNullException()
         {
             // Call
-            TestDelegate call = () => GrassCoverErosionInwardsChartDataFactory.Create((Point2D[]) null, "dike profile name");
+            TestDelegate call = () => GrassCoverErosionInwardsChartDataFactory.Create((RoundedPoint2DCollection) null, "dike profile name");
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
@@ -94,7 +94,7 @@
             };
 
             // Call
-            ChartData data = GrassCoverErosionInwardsChartDataFactory.Create(dikeProfile.ForeshoreGeometry.ToArray(), dikeProfile.Name);
+            ChartData data = GrassCoverErosionInwardsChartDataFactory.Create(dikeProfile.ForeshoreGeometry, dikeProfile.Name);
 
             // Assert
             Assert.IsInstanceOf<ChartLineData>(data);
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/Views/GrassCoverErosionInwardsInputViewTest.cs
===================================================================
diff -u -rba00ac482d95f158a6f51caec7b0de3d1e1ecc4c -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/Views/GrassCoverErosionInwardsInputViewTest.cs	(.../GrassCoverErosionInwardsInputViewTest.cs)	(revision ba00ac482d95f158a6f51caec7b0de3d1e1ecc4c)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/Views/GrassCoverErosionInwardsInputViewTest.cs	(.../GrassCoverErosionInwardsInputViewTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -486,8 +486,8 @@
             Assert.IsInstanceOf<ChartLineData>(chartData);
             ChartLineData foreshoreChartData = (ChartLineData) chartData;
 
-            Point2D[] foreshoreGeometry = dikeProfile.ForeshoreGeometry.ToArray();
-            Assert.AreEqual(foreshoreGeometry.Length, foreshoreChartData.Points.Count());
+            RoundedPoint2DCollection foreshoreGeometry = dikeProfile.ForeshoreGeometry;
+            Assert.AreEqual(foreshoreGeometry.Count(), foreshoreChartData.Points.Count());
             CollectionAssert.AreEqual(foreshoreGeometry, foreshoreChartData.Points);
 
             string expectedName = string.Format(Resources.GrassCoverErosionInwardsChartDataFactory_Create_DataIdentifier_0_DataTypeDisplayName_1_,
Index: Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs
===================================================================
diff -u -re62502b93eb5144e00dcba97a69b6c6088b99656 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision e62502b93eb5144e00dcba97a69b6c6088b99656)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Primitives/RingtoetsPipingSurfaceLine.cs	(.../RingtoetsPipingSurfaceLine.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -246,7 +246,7 @@
         /// intersection point at <paramref name="l"/> have a significant difference in their y coordinate.</exception>
         /// <exception cref="ArgumentOutOfRangeException"><paramref name="l"/> is not in range of the LZ-projected <see cref="Points"/>.</exception>
         /// <exception cref="InvalidOperationException"><see cref="Points"/> is empty.</exception>
-        public RoundedDouble GetZAtL(double l)
+        public double GetZAtL(double l)
         {
             ValidateHasPoints();
 
@@ -267,7 +267,7 @@
 
             if (equalIntersections)
             {
-                return new RoundedDouble(2, intersectionPoints.First().Y);
+                return intersectionPoints.First().Y;
             }
 
             var message = string.Format(Resources.RingtoetsPipingSurfaceLine_Cannot_determine_reliable_z_when_surface_line_is_vertical_in_l, l);
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingInputTest.cs
===================================================================
diff -u -re62502b93eb5144e00dcba97a69b6c6088b99656 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingInputTest.cs	(.../PipingInputTest.cs)	(revision e62502b93eb5144e00dcba97a69b6c6088b99656)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingInputTest.cs	(.../PipingInputTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -183,7 +183,7 @@
             RoundedPoint2DCollection localGeometry = pipingInput.SurfaceLine.ProjectGeometryToLZ();
 
             // Assert
-            Assert.AreEqual(pipingInput.ExitPointL.NumberOfDecimalPlaces, localGeometry.NumberOfDecimalPlaces);
+            Assert.AreEqual(localGeometry.NumberOfDecimalPlaces, pipingInput.ExitPointL.NumberOfDecimalPlaces);
         }
 
         [Test]
@@ -290,7 +290,7 @@
             RoundedPoint2DCollection localGeometry = pipingInput.SurfaceLine.ProjectGeometryToLZ();
 
             // Assert
-            Assert.AreEqual(pipingInput.EntryPointL.NumberOfDecimalPlaces, localGeometry.NumberOfDecimalPlaces);
+            Assert.AreEqual(localGeometry.NumberOfDecimalPlaces, pipingInput.EntryPointL.NumberOfDecimalPlaces);
         }
 
         [Test]
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineTest.cs
===================================================================
diff -u -re62502b93eb5144e00dcba97a69b6c6088b99656 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineTest.cs	(.../RingtoetsPipingSurfaceLineTest.cs)	(revision e62502b93eb5144e00dcba97a69b6c6088b99656)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineTest.cs	(.../RingtoetsPipingSurfaceLineTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Core.Common.Base.Data;
 using Core.Common.Base.Geometry;
 using Core.Common.Base.Storage;
 using Core.Common.TestUtil;
@@ -138,10 +139,11 @@
             var surfaceLine = new RingtoetsPipingSurfaceLine();
 
             // Call
-            IEnumerable<Point2D> lzCoordinates = surfaceLine.ProjectGeometryToLZ();
+            RoundedPoint2DCollection lzCoordinates = surfaceLine.ProjectGeometryToLZ();
 
             // Assert
             CollectionAssert.IsEmpty(lzCoordinates);
+            Assert.AreEqual(2, lzCoordinates.NumberOfDecimalPlaces);
         }
 
         [Test]
@@ -156,13 +158,14 @@
             });
 
             // Call
-            Point2D[] lzCoordinates = surfaceLine.ProjectGeometryToLZ().ToArray();
+            RoundedPoint2DCollection lzCoordinates = surfaceLine.ProjectGeometryToLZ();
 
             // Assert
             CollectionAssert.AreEqual(new[]
             {
                 new Point2D(0.0, originalZ)
             }, lzCoordinates);
+            Assert.AreEqual(2, lzCoordinates.NumberOfDecimalPlaces);
         }
 
         [Test]
@@ -178,7 +181,7 @@
             });
 
             // Call
-            Point2D[] actual = surfaceLine.ProjectGeometryToLZ().ToArray();
+            RoundedPoint2DCollection actual = surfaceLine.ProjectGeometryToLZ();
 
             // Assert
             var length = Math.Sqrt(2*2 + 3*3);
@@ -189,8 +192,9 @@
                 secondCoordinateFactor*length,
                 length
             };
-            CollectionAssert.AreEqual(expectedCoordinatesX, actual.Select(p => p.X).ToArray(), new DoubleWithToleranceComparer(1e-2));
+            CollectionAssert.AreEqual(expectedCoordinatesX, actual.Select(p => p.X).ToArray(), new DoubleWithToleranceComparer(Math.Pow(10.0, -actual.NumberOfDecimalPlaces)));
             CollectionAssert.AreEqual(surfaceLine.Points.Select(p => p.Z).ToArray(), actual.Select(p => p.Y).ToArray());
+            Assert.AreEqual(2, actual.NumberOfDecimalPlaces);
         }
 
         [Test]
@@ -258,7 +262,7 @@
             var result = surfaceLine.GetZAtL(l);
 
             // Assert
-            Assert.AreEqual(testZ, result, 1e-3);
+            Assert.AreEqual(testZ, result, 1e-2);
         }
 
         [Test]
Index: Ringtoets/Piping/test/Ringtoets.Piping.InputParameterCalculation.Test/InputParameterCalculationServiceTest.cs
===================================================================
diff -u -r558605d41d8d3a54d2d8b5aee1ace1a36cb64214 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/Piping/test/Ringtoets.Piping.InputParameterCalculation.Test/InputParameterCalculationServiceTest.cs	(.../InputParameterCalculationServiceTest.cs)	(revision 558605d41d8d3a54d2d8b5aee1ace1a36cb64214)
+++ Ringtoets/Piping/test/Ringtoets.Piping.InputParameterCalculation.Test/InputParameterCalculationServiceTest.cs	(.../InputParameterCalculationServiceTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -222,9 +222,9 @@
             {
                 Assert.Fail("Expected value for otherPoint.");
             }
-            Assert.AreEqual(point.X, otherPoint.X, 1e-6);
-            Assert.AreEqual(point.Y, otherPoint.Y, 1e-6);
-            Assert.AreEqual(point.Z, otherPoint.Z, 1e-6);
+            Assert.AreEqual(point.X, otherPoint.X, 1e-2);
+            Assert.AreEqual(point.Y, otherPoint.Y, 1e-2);
+            Assert.AreEqual(point.Z, otherPoint.Z, 1e-2);
         }
 
         private static void AssertEqualSoilProfiles(PipingSoilProfile pipingProfile, PipingProfile otherPipingProfile)
Index: Ringtoets/Piping/test/Ringtoets.Piping.KernelWrapper.Test/PipingSurfaceLineCreatorTest.cs
===================================================================
diff -u -r558605d41d8d3a54d2d8b5aee1ace1a36cb64214 -rfa851b16b32a7255c860355147a3ed4deaa10cef
--- Ringtoets/Piping/test/Ringtoets.Piping.KernelWrapper.Test/PipingSurfaceLineCreatorTest.cs	(.../PipingSurfaceLineCreatorTest.cs)	(revision 558605d41d8d3a54d2d8b5aee1ace1a36cb64214)
+++ Ringtoets/Piping/test/Ringtoets.Piping.KernelWrapper.Test/PipingSurfaceLineCreatorTest.cs	(.../PipingSurfaceLineCreatorTest.cs)	(revision fa851b16b32a7255c860355147a3ed4deaa10cef)
@@ -61,7 +61,7 @@
             // Assert
             var expectedCoordinatesX = surfaceLine.Points.Select(p => p.X - firstX).ToArray();
             Assert.AreEqual(name, actual.Name);
-            CollectionAssert.AreEqual(expectedCoordinatesX, actual.Points.Select(p => p.X).ToArray(), new DoubleWithToleranceComparer(1e-6));
+            CollectionAssert.AreEqual(expectedCoordinatesX, actual.Points.Select(p => p.X).ToArray(), new DoubleWithToleranceComparer(1e-2));
             CollectionAssert.AreEqual(surfaceLine.Points.Select(p => p.Y).ToArray(), actual.Points.Select(p => p.Y).ToArray());
             CollectionAssert.AreEqual(surfaceLine.Points.Select(p => p.Z).ToArray(), actual.Points.Select(p => p.Z).ToArray());
             CollectionAssert.AreEqual(Enumerable.Repeat(PipingCharacteristicPointType.None, surfaceLine.Points.Length), actual.Points.Select(p => p.Type));