public void epsg3140_to_wgs()
{
var crs = EpsgMicroDatabase.Default.GetCrs(3140);
var wgs = EpsgMicroDatabase.Default.GetCrs(4326);
// source for coordinates is http://epsg.io/3140/map
var ptWgs = new GeographicCoordinate(-17.785, 177.97);
var pt3140 = new Point2(530138.52663372, 821498.68898981); // units in links
var gen = new EpsgCrsCoordinateOperationPathGenerator();
var paths = gen.Generate(wgs, crs);
var compiler = new StaticCoordinateOperationCompiler();
var txs = paths
.Select(p => compiler.Compile(p))
.Where(p => p != null);
var forward = txs.Single();
var actualForward = (Point2)forward.TransformValue(ptWgs);
Assert.AreEqual(pt3140.X, actualForward.X, 30);
Assert.AreEqual(pt3140.Y, actualForward.Y, 30);
var reverse = forward.GetInverse();
var actualReverse = (GeographicCoordinate)reverse.TransformValue(pt3140);
Assert.AreEqual(ptWgs.Longitude, actualReverse.Longitude, 0.01);
Assert.AreEqual(ptWgs.Latitude, actualReverse.Latitude, 0.01);
}
public void Test(string sourceResourceName, string targetResourceName, double projectDelta, double unprojectDelta)
{
var sourceData = GoldData.GetReadyReader(sourceResourceName);
var targetData = GoldData.GetReadyReader(targetResourceName);
var sourceCrs = GoldData.GetCrs(sourceData);
var targetCrs = GoldData.GetCrs(targetData);
Assert.IsNotNull(sourceCrs);
Assert.IsNotNull(targetCrs);
var operationGenerator = new HelmertCrsCoordinateOperationPathGenerator();
var operationPath = operationGenerator.Generate(sourceCrs, targetCrs).First();
Assert.IsNotNull(operationPath);
var compiler = new StaticCoordinateOperationCompiler();
var forward = new CompiledConcatenatedTransformation<GeographicCoordinate, Point2>(compiler.Compile(operationPath) as IEnumerable<ITransformation>);
var inverse = forward.GetInverse();
while (sourceData.Read() && targetData.Read()) {
var geogreaphicExpected = sourceData.CurrentLatLon();
var projectedExpected = targetData.CurrentPoint2D();
var projected = forward.TransformValue(geogreaphicExpected);
Assert.AreEqual(projectedExpected.X, projected.X, projectDelta);
Assert.AreEqual(projectedExpected.Y, projected.Y, projectDelta);
var geographic = inverse.TransformValue(projectedExpected);
Assert.AreEqual(geogreaphicExpected.Latitude, geographic.Latitude, unprojectDelta);
Assert.AreEqual(geogreaphicExpected.Longitude, geographic.Longitude, unprojectDelta);
}
}
public void epsg3079_to_epsg3575()
{
var from = EpsgMicroDatabase.Default.GetCrs(3079);
var to = EpsgMicroDatabase.Default.GetCrs(3575);
var wgs = EpsgMicroDatabase.Default.GetCrs(4326);
var somePlaceInMichigan = new GeographicCoordinate(40.4, -91.8);
var expected3079 = new Point2(6992.885640195105, -644.956855237484);
var expected3575 = new Point2(-5244224.354585549, 1095575.5476152631);
var gen = new EpsgCrsCoordinateOperationPathGenerator();
var fromPath = gen.Generate(from, wgs).First();
var toPath = gen.Generate(to, wgs).First();
var compiler = new StaticCoordinateOperationCompiler();
var fromTx = compiler.Compile(fromPath);
var toTx = compiler.Compile(toPath);
var a = (GeographicCoordinate)fromTx.TransformValue(expected3079);
Assert.AreEqual(somePlaceInMichigan.Latitude, a.Latitude, 0.01);
Assert.AreEqual(somePlaceInMichigan.Longitude, a.Longitude, 0.01);
var b = (Point2)fromTx.GetInverse().TransformValue(somePlaceInMichigan);
Assert.AreEqual(expected3079.X, b.X, 0.01);
Assert.AreEqual(expected3079.Y, b.Y, 0.01);
var d = (Point2)toTx.GetInverse().TransformValue(somePlaceInMichigan);
Assert.AreEqual(expected3575.X, d.X, 0.01);
Assert.AreEqual(expected3575.Y, d.Y, 0.01);
var c = (GeographicCoordinate)toTx.TransformValue(expected3575);
Assert.AreEqual(somePlaceInMichigan.Latitude, c.Latitude, 0.01);
Assert.AreEqual(somePlaceInMichigan.Longitude, c.Longitude, 0.01);
var allTotalPaths = gen.Generate(from, to).ToList();
var totalPath = allTotalPaths.First();
var totalTx = compiler.Compile(totalPath);
var actual3575 = (Point2)totalTx.TransformValue(expected3079);
Assert.AreEqual(expected3575.X, actual3575.X, 1);
Assert.AreEqual(expected3575.Y, actual3575.Y, 1);
}
private ConversionResult ExecuteStaticEpsg(TestCase testCase)
{
var result = new ConversionResult();
try {
var paths = _epsgPathGenerator.Generate(testCase.Source, testCase.Target)
.OrderBy(x => GetEpsgAccuracy(x) ?? 999);
var compiler = new StaticCoordinateOperationCompiler();
var compiledPaths = paths
.Select(x => compiler.Compile(x));
var bestCompiledPath = compiledPaths.FirstOrDefault(x => x != null);
var transformation = bestCompiledPath;
if (transformation == null)
throw new InvalidOperationException("No compiled transformation");
result.ResultData = transformation.TransformValues(testCase.InputCoordinates).ToArray();
}
catch (Exception ex) {
result.Exception = ex;
}
return result;
}
public void epsg3857_to_wgs()
{
var crs = EpsgMicroDatabase.Default.GetCrs(3857);
var wgs = EpsgMicroDatabase.Default.GetCrs(4326);
var ptWgs = new GeographicCoordinate(45,10);
var pt3857 = new Point2(1113194, 5621521);
var gen = new EpsgCrsCoordinateOperationPathGenerator();
var paths = gen.Generate(wgs, crs);
var compiler = new StaticCoordinateOperationCompiler();
var txs = paths.Select(p => compiler.Compile(p)).Where(p => p != null);
var forward = txs.Single();
var actualZeroMeters = (Point2)forward.TransformValue(GeographicCoordinate.Zero);
Assert.AreEqual(0, actualZeroMeters.X);
Assert.AreEqual(0, actualZeroMeters.Y, 0.0000001);
var actualForward = (Point2)forward.TransformValue(ptWgs);
Assert.AreEqual(pt3857.X, actualForward.X, 30);
Assert.AreEqual(pt3857.Y, actualForward.Y, 30);
var reverse = forward.GetInverse();
var actualZeroDegrees = (GeographicCoordinate)reverse.TransformValue(Point2.Zero);
Assert.AreEqual(0, actualZeroDegrees.Longitude);
Assert.AreEqual(0, actualZeroDegrees.Latitude);
var actualReverse = (GeographicCoordinate)reverse.TransformValue(pt3857);
Assert.AreEqual(ptWgs.Longitude, actualReverse.Longitude, 0.0001);
Assert.AreEqual(ptWgs.Latitude, actualReverse.Latitude, 0.0001);
}
public void epsg4326_to_5072()
{
var wgs = EpsgMicroDatabase.Default.GetCrs(4326);
var nad83Albers = EpsgMicroDatabase.Default.GetCrs(5072);
var gen = new EpsgCrsCoordinateOperationPathGenerator();
var paths = gen.Generate(wgs, nad83Albers);
var compiler = new StaticCoordinateOperationCompiler();
var txs = paths.Select(p => compiler.Compile(p)).Where(p => p != null);
var forward = txs.Single();
var transformed = (Point2)forward.TransformValue(new GeographicCoordinate(39, -105));
Assert.AreEqual(-771063, transformed.X, 1);
Assert.AreEqual(1811448, transformed.Y, 1);
}
public HttpResponseMessage Draw(double? minLon, double? maxLon, double? minLat, double? maxLat, int? maxImgWidth, int? maxImgHeight)
{
var shapefilePath = HostingEnvironment.MapPath("~/App_Data/builtupp_usa/builtupp_usa.shp");
ITransformation<GeographicCoordinate, Point2> transformation = null;
var targetCrs = EpsgMicroDatabase.Default.GetCrs(3005);
LongitudeDegreeRange dataLongitudeRange;
Range dataLatitudeRange;
using (var shapeFile = Shapefile.Open(shapefilePath)) {
dataLongitudeRange = new LongitudeDegreeRange(shapeFile.Extent.MinX, shapeFile.Extent.MaxX);
dataLatitudeRange = new Range(shapeFile.Extent.MinY, shapeFile.Extent.MaxY);
var dataCrs = EpsgMicroDatabase.Default.GetCrs(4326);
var pathGenerator = new EpsgCrsCoordinateOperationPathGenerator();
var paths = pathGenerator.Generate(dataCrs, targetCrs);
var compiler = new StaticCoordinateOperationCompiler();
var firstTransfom = paths.Select(p => {
return compiler.Compile(p);
}).First(x => x != null);
transformation = firstTransfom as ITransformation<GeographicCoordinate, Point2>;
if (transformation == null && firstTransfom is IEnumerable<ITransformation>)
transformation = new CompiledConcatenatedTransformation<GeographicCoordinate, Point2>((IEnumerable<ITransformation>)firstTransfom);
}
var geoMbrMin = new GeographicCoordinate(minLat ?? dataLatitudeRange.Low, minLon ?? dataLongitudeRange.Start);
var geoMbrMax = new GeographicCoordinate(maxLat ?? dataLatitudeRange.High, maxLon ?? dataLongitudeRange.End);
var geoMbrTL = new GeographicCoordinate(geoMbrMax.Latitude, geoMbrMin.Longitude);
var geoMbrTR = new GeographicCoordinate(geoMbrMin.Latitude, geoMbrMax.Longitude);
var projectedMbrPoints = new[] {
geoMbrMin,
geoMbrMax,
geoMbrTL,
geoMbrTR,
new GeographicCoordinate(geoMbrMin.Latitude, Math.Abs(geoMbrMin.Longitude + geoMbrMax.Longitude) / 2.0)
}
.Select(transformation.TransformValue)
.ToArray();
var projectedExtent = new Mbr(
new Point2(projectedMbrPoints.Min(x => x.X), projectedMbrPoints.Min(x => x.Y)),
new Point2(projectedMbrPoints.Max(x => x.X), projectedMbrPoints.Max(x => x.Y))
);
var geogMapOrigin = new GeographicCoordinate(dataLatitudeRange.Mid, dataLongitudeRange.Mid);
var mapOrigin = transformation.TransformValue(geogMapOrigin);
var mapOffset = new Vector2(0/*-(mapOrigin.X - projectedExtent.X.Mid)*/, projectedExtent.Height / 2.0);
var imageSizeLimits = new Vector2(maxImgWidth ?? 300, maxImgHeight ?? 300);
if (imageSizeLimits.X > 4096 || imageSizeLimits.Y > 4096)
throw new ArgumentException("Image size too large");
var dataRatio = new Vector2(projectedExtent.Width / imageSizeLimits.X, projectedExtent.Height / imageSizeLimits.Y);
var lowCorner = projectedExtent.Min;
Vector2 desiredImageSize;
double imageScaleFactor;
if (dataRatio.Y < dataRatio.X) {
imageScaleFactor = imageSizeLimits.X / projectedExtent.Width;
desiredImageSize = new Vector2(imageSizeLimits.X, (int)(projectedExtent.Height * imageScaleFactor));
}
else {
imageScaleFactor = imageSizeLimits.Y / projectedExtent.Height;
desiredImageSize = new Vector2((int)(projectedExtent.Width * imageScaleFactor), imageSizeLimits.Y);
}
using (var image = new System.Drawing.Bitmap((int)desiredImageSize.X, (int)desiredImageSize.Y))
using (var graphics = Graphics.FromImage(image)) {
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
var shapeSource = new PointShapefileShapeSource(shapefilePath);
var shapeReader = new ShapeReader(shapeSource);
using (var shapeEnumerator = shapeReader.GetEnumerator()) {
var sourceCoordinates = ReadPagesToGeographicCoordinate(shapeEnumerator).SelectMany(x => x);
var pointColor = Color.Black;
var circleFillBrush = new SolidBrush(Color.FromArgb(64,16,64,128));
var featureRadius = 3.0;
var featureDiameter = featureRadius * 2;
var featureDiameterFloat = (float)featureDiameter;
var topLeftOffset = new Vector2(-featureRadius,-featureRadius);
foreach (var transformedPoint in transformation.TransformValues(sourceCoordinates)) {
var offsetPoint = transformedPoint.Difference(lowCorner).Add(mapOffset);
var scaledPoint = offsetPoint.GetScaled(imageScaleFactor);
var screenPoint = new Point2(scaledPoint.X, image.Height - scaledPoint.Y);
var drawTopLeft = screenPoint.Add(topLeftOffset);
graphics.FillEllipse(circleFillBrush, (float)drawTopLeft.X, (float)drawTopLeft.Y, featureDiameterFloat, featureDiameterFloat);
}
}
var result = new HttpResponseMessage(HttpStatusCode.OK);
byte[] imageBytes;
using (var memoryStream = new MemoryStream()) {
image.Save(memoryStream, ImageFormat.Png);
imageBytes = memoryStream.ToArray();
}
result.Content = new ByteArrayContent(imageBytes);
result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("image/png");
return result;
}
}
private Helmert7Transformation ExtractHelmert7Transformation(EpsgCoordinateTransformInfo transform)
{
var method = transform.Method;
Contract.Assume(method != null);
var compiler = new StaticCoordinateOperationCompiler();
var compileRequest = new CoordinateOperationCrsPathInfo(
new[] { transform.SourceCrs, transform.TargetCrs },
new[] { transform });
var compileResult = compiler.Compile(compileRequest);
if (compileResult == null)
return null;
var transformSteps = (compileResult as IEnumerable<ITransformation>) ?? ArrayUtil.CreateSingleElementArray(compileResult);
var exposedSteps = transformSteps.Select(step => {
if (step is GeocentricTransformationGeographicWrapper) {
return ((GeocentricTransformationGeographicWrapper)step).GeocentricCore;
}
return step;
});
foreach (var step in exposedSteps) {
if (step is Helmert7Transformation) {
return step as Helmert7Transformation;
}
if (step is GeocentricTranslation) {
return new Helmert7Transformation(((GeocentricTranslation)step).Delta);
}
if (step is GeographicGeocentricTranslation) {
return new Helmert7Transformation(((GeographicGeocentricTranslation)step).Delta);
}
}
return null;
}
