public void TestML()
        {
            {
                const double scale          = 2.0E10;
                var          precisionModel = new PrecisionModel(scale);
                var          gs             = new NtsGeometryServices(precisionModel, 0);
                //var geometryFactory = gs.CreateGeometryFactory();

                var reader      = new WKTReader(gs);
                var lineStringA = (LineString)
                                  reader.Read("LINESTRING (-93.40178610435 -235.5437531975, -401.24229900825 403.69365857925)");
                var lineStringB = (LineString)
                                  reader.Read("LINESTRING (-50.0134121926 -145.44686640725, -357.8539250965 493.7905453695)");
                var lineStringC = (LineString)
                                  reader.Read("LINESTRING (-193.8964147753 -30.64653554935, -186.68866383205 -34.1176054623)");

                var middlePoint = (Point)reader.Read("POINT (-203.93366864454998 174.171839481125)");

                var lineStrings = new List <LineString>();
                lineStrings.Add(lineStringA);
                lineStrings.Add(lineStringB);
                lineStrings.Add(lineStringC);

                var noder            = new GeometryNoder(precisionModel);
                var nodedLineStrings = noder.Node(lineStrings.ToArray());

                double shortestDistanceToPointBeforeNoding = double.MaxValue;

                foreach (var lineString in lineStrings)
                {
                    shortestDistanceToPointBeforeNoding = Math.Min(lineString.Distance(middlePoint),
                                                                   shortestDistanceToPointBeforeNoding);
                }

                double shortestDistanceToPointAfterNoding = double.MaxValue;

                foreach (var lineString in nodedLineStrings)
                {
                    shortestDistanceToPointAfterNoding = Math.Min(lineString.Distance(middlePoint),
                                                                  shortestDistanceToPointAfterNoding);
                }

                double difference = Math.Abs(shortestDistanceToPointAfterNoding - shortestDistanceToPointBeforeNoding);

                TestContext.WriteLine("Scale: {0}", scale);
                TestContext.WriteLine("Distance to point before noding: {0}", shortestDistanceToPointBeforeNoding);
                TestContext.WriteLine("Distance to point after noding:  {0}", shortestDistanceToPointAfterNoding);
                TestContext.WriteLine("Difference is {0} and should be lesser than {1}", difference, 1.0 / scale);

                const double roughTolerance = 10.0;
                Assert.IsTrue(difference < roughTolerance, "this difference should should be lesser than " + 1.0 / scale);
            }
        }
        public static Geometry NodeWithPointwisePrecision(Geometry geom, double scaleFactor)
        {
            var pm = new PrecisionModel(scaleFactor);

            var roundedGeom = GeometryPrecisionReducer.Reduce(geom, pm);

            var geomList = new List <Geometry>();

            geomList.Add(roundedGeom);

            var noder = new GeometryNoder(pm);
            var lines = noder.Node(geomList);

            return(Utility.FunctionsUtil.getFactoryOrDefault(geom).BuildGeometry(lines.Cast <Geometry>().ToList()));
        }
        public static IGeometry NodeWithPointwisePrecision(IGeometry geom, double scaleFactor)
        {
            var pm = new PrecisionModel(scaleFactor);

            var roundedGeom = GeometryPrecisionReducer.Reduce(geom, pm);

            var geomList = new List <IGeometry>();

            geomList.Add(roundedGeom);

            var noder = new GeometryNoder(pm);
            var lines = noder.Node(geomList);

            return(FunctionsUtil.getFactoryOrDefault(geom).BuildGeometry(CollectionUtil.Cast <IGeometry>((ICollection)lines)));
        }
Example #4
0
        /// <summary>
        /// Reduces precision pointwise, then snap-rounds.
        /// Note that output set may not contain non-unique linework
        /// (and thus cannot be used as input to Polygonizer directly).
        /// UnaryUnion is one way to make the linework unique.
        /// </summary>
        /// <param name="geom">A geometry containing linework to node</param>
        /// <param name="scaleFactor">the precision model scale factor to use</param>
        /// <returns>The noded, snap-rounded linework</returns>
        public static IGeometry SnapRoundWithPointwisePrecisionReduction(IGeometry geom, double scaleFactor)
        {
            var pm = new PrecisionModel(scaleFactor);

            var roundedGeom = GeometryPrecisionReducer.ReducePointwise(geom, pm);

            var geomList = new List <IGeometry>();

            geomList.Add(roundedGeom);

            var noder = new GeometryNoder(pm);
            var lines = noder.Node(geomList);

            return(FunctionsUtil.GetFactoryOrDefault(geom).BuildGeometry(lines.Cast <IGeometry>().ToArray()));
        }
        private void CheckRounding(string[] wkt)
        {
            var geoms = FromWKT(wkt);
            var pm    = new PrecisionModel(SnapTolerance);
            var noder = new GeometryNoder(pm);

            noder.IsValidityChecked = true;
            var nodedLines = noder.Node(geoms);

            foreach (var ls in nodedLines)
            {
                TestContext.WriteLine(ls);
            }

            Assert.IsTrue(IsSnapped(nodedLines, SnapTolerance));
        }
Example #6
0
        /// <summary>
        /// Creates a featureset from the given raster.
        /// </summary>
        /// <param name="rst">Raster used for creation.</param>
        /// <param name="contourType">The contour type used for creation.</param>
        /// <param name="fieldName">Name of the field that gets added to the featureset to put the level values into.</param>
        /// <param name="levels">The levels to sort the features into.</param>
        /// <returns>The featureset that was created from the raster.</returns>
        public static FeatureSet Execute(Raster rst, ContourType contourType, string fieldName = "Value", double[] levels = null)
        {
            double[] lev = levels;
            noData = rst.NoDataValue;
            type   = contourType;
            Raster iRst = RasterCheck(rst, lev);

            string field = fieldName ?? "Value";

            double[] x = new double[rst.NumColumns];
            double[] y = new double[rst.NumRows];

            for (int i = 0; i < rst.NumColumns; i++)
            {
                x[i] = rst.Extent.MinX + (rst.CellWidth * i) + (rst.CellWidth / 2);
            }

            for (int i = 0; i < rst.NumRows; i++)
            {
                y[i] = rst.Extent.MaxY - (rst.CellHeight * i) - (rst.CellHeight / 2);
            }

            FeatureSet fs = null;

            switch (type)
            {
            case ContourType.Line:
                fs = new FeatureSet(FeatureType.Line);
                fs.DataTable.Columns.Add(field, typeof(double));

                if (levels != null)
                {
                    for (int z = 0; z < levels.Length; z++)
                    {
                        IList <IGeometry> cont = GetContours(ref iRst, x, y, lev[z]);

                        foreach (var g in cont)
                        {
                            var f = (Feature)fs.AddFeature((ILineString)g);
                            f.DataRow[field] = lev[z];
                        }
                    }
                }

                break;

            case ContourType.Polygon:

                fs = new FeatureSet(FeatureType.Polygon);
                fs.DataTable.Columns.Add("Lev", typeof(int));
                fs.DataTable.Columns.Add("Label", typeof(string));

                Collection <IGeometry> contours = new Collection <IGeometry>();
                if (levels != null)
                {
                    for (int z = 0; z < levels.Length; z++)
                    {
                        IList <IGeometry> cont = GetContours(ref iRst, x, y, lev[z]);

                        foreach (var g in cont)
                        {
                            contours.Add(new LineString(g.Coordinates));
                        }
                    }

                    Coordinate[] boundary = new Coordinate[5];

                    boundary[0] = new Coordinate(x[0], y[0]);
                    boundary[1] = new Coordinate(x[0], y[rst.NumRows - 1]);
                    boundary[2] = new Coordinate(x[rst.NumColumns - 1], y[rst.NumRows - 1]);
                    boundary[3] = new Coordinate(x[rst.NumColumns - 1], y[0]);
                    boundary[4] = new Coordinate(x[0], y[0]);

                    contours.Add(new LineString(boundary));

                    Collection <IGeometry> nodedContours = new Collection <IGeometry>();
                    IPrecisionModel        pm            = new PrecisionModel(1000d);
                    GeometryNoder          geomNoder     = new GeometryNoder(pm);

                    foreach (var c in geomNoder.Node(contours))
                    {
                        nodedContours.Add(c);
                    }

                    Polygonizer polygonizer = new Polygonizer();
                    polygonizer.Add(nodedContours);

                    foreach (IPolygon p in polygonizer.GetPolygons().OfType <IPolygon>())
                    {
                        IPoint pnt = p.InteriorPoint;

                        int c = (int)((pnt.X - iRst.Extent.MinX) / iRst.CellWidth);
                        int r = (int)((iRst.Extent.MaxY - pnt.Y) / iRst.CellHeight);

                        double z = iRst.Value[r, c];

                        int    cls   = GetLevel(z, lev);
                        string label = "Undefined";

                        if (cls == -1)
                        {
                            label = "< " + lev[0];
                        }
                        else if (cls == lev.Length)
                        {
                            label = "> " + lev[lev.Length - 1];
                        }
                        else if (cls >= 0 & cls < lev.Length)
                        {
                            label = lev[cls] + " - " + lev[cls + 1];
                        }

                        IFeature f = fs.AddFeature(p);
                        f.DataRow["Lev"]   = cls;
                        f.DataRow["Label"] = label;
                    }
                }

                break;
            }

            return(fs);
        }
Example #7
0
        public static DotSpatial.Data.FeatureSet Execute(DotSpatial.Data.Raster rst, ContourType contourType, string FieldName = "Value", double[] levels = null)
        {
            double[] lev = levels;
            noData = rst.NoDataValue;
            type   = contourType;
            DotSpatial.Data.Raster iRst = RasterCheck(rst, lev);;

            string field;

            if (FieldName == null)
            {
                field = "Value";
            }
            else
            {
                field = FieldName;
            }

            double[] x = new double[rst.NumColumns];
            double[] y = new double[rst.NumRows];

            for (int i = 0; i < rst.NumColumns; i++)
            {
                x[i] = rst.Extent.MinX + rst.CellWidth * i + rst.CellWidth / 2;
            }

            for (int i = 0; i < rst.NumRows; i++)
            {
                y[i] = rst.Extent.MaxY - rst.CellHeight * i - rst.CellHeight / 2;
            }

            DotSpatial.Data.FeatureSet fs = null;

            switch (type)
            {
            case ContourType.Line:
            {
                fs = new DotSpatial.Data.FeatureSet(DotSpatial.Topology.FeatureType.Line);
                fs.DataTable.Columns.Add(field, typeof(double));

                for (int z = 0; z < levels.Length; z++)
                {
                    IList <IGeometry> cont = GetContours(ref iRst, x, y, lev[z]);

                    foreach (var g in cont)
                    {
                        var f = (DotSpatial.Data.Feature)fs.AddFeature(ToDotSpatialLineString((ILineString)g));
                        f.DataRow[field] = lev[z];
                    }
                }
            }
            break;

            case ContourType.Polygon:
            {
                fs = new DotSpatial.Data.FeatureSet(DotSpatial.Topology.FeatureType.Polygon);

                fs.DataTable.Columns.Add("Lev", typeof(int));
                fs.DataTable.Columns.Add("Label", typeof(string));

                Collection <IGeometry> Contours = new Collection <IGeometry>();

                for (int z = 0; z < levels.Count(); z++)
                {
                    IList <IGeometry> cont = GetContours(ref iRst, x, y, lev[z]);

                    foreach (var g in cont)
                    {
                        Contours.Add(new LineString(g.Coordinates));
                    }
                }

                Coordinate[] Boundary = new Coordinate[5];

                Boundary[0] = new Coordinate(x[0], y[0]);
                Boundary[1] = new Coordinate(x[0], y[rst.NumRows - 1]);
                Boundary[2] = new Coordinate(x[rst.NumColumns - 1], y[rst.NumRows - 1]);
                Boundary[3] = new Coordinate(x[rst.NumColumns - 1], y[0]);
                Boundary[4] = new Coordinate(x[0], y[0]);

                Contours.Add(new LineString(Boundary));

                Collection <IGeometry> NodedContours = new Collection <IGeometry>();
                GeometryNoder          geomNoder     = new GeometryNoder(new PrecisionModel(1000d));

                foreach (var c in geomNoder.Node(Contours))
                {
                    NodedContours.Add(c);
                }

                Polygonizer polygonizer = new Polygonizer();
                polygonizer.Add(NodedContours);

                foreach (IPolygon p in polygonizer.GetPolygons())
                {
                    Point pnt = (Point)p.InteriorPoint;

                    int c = (int)((pnt.X - iRst.Extent.MinX) / iRst.CellWidth);
                    int r = (int)((iRst.Extent.MaxY - pnt.Y) / iRst.CellHeight);

                    double z = ((DotSpatial.Data.Raster)iRst).Value[r, c];

                    int    Cls   = GetLevel(z, lev);
                    string label = "Undefined";

                    if (Cls == -1)
                    {
                        label = "< " + lev[0].ToString();
                    }
                    if (Cls == lev.Count())
                    {
                        label = "> " + lev[lev.Count() - 1].ToString();
                    }
                    if (Cls >= 0 & Cls < lev.Count())
                    {
                        label = lev[Cls].ToString() + " - " + lev[Cls + 1].ToString();
                    }

                    DotSpatial.Topology.Polygon dsp = ToDotSpatialPolygon(p);

                    DotSpatial.Data.Feature f = (DotSpatial.Data.Feature)fs.AddFeature(dsp);
                    f.DataRow["Lev"]   = Cls;
                    f.DataRow["Label"] = label;
                }
            }
            break;
            }

            return(fs);
        }