C# 使用NetTopologySuite TransformGeometry时出错
我正在尝试读取一个形状文件,该文件将英国北/东坐标系(BritishNationalGridOSGB36)转换为纬度/经度(WGS1984)。我发现了一篇关于如何使用NetTopologySuite实现这一点的优秀文章。shapefile的读取工作正常,但在加载期间转换地理位置时遇到问题 我已将问题归结为NetTopologySuite变换几何方法。如果我使用DotSpatial ReprojectPoints转换一个点,它将正常工作(一旦我为BritishNationalGridOSGB36获得了正确的定义,请参阅以获取关于此的有用帖子)。然而,NetTopologySuite的变换几何给了我一个错误的答案。答案在两个方面是错误的C# 使用NetTopologySuite TransformGeometry时出错,c#,.net,gis,nettopologysuite,C#,.net,Gis,Nettopologysuite,我正在尝试读取一个形状文件,该文件将英国北/东坐标系(BritishNationalGridOSGB36)转换为纬度/经度(WGS1984)。我发现了一篇关于如何使用NetTopologySuite实现这一点的优秀文章。shapefile的读取工作正常,但在加载期间转换地理位置时遇到问题 我已将问题归结为NetTopologySuite变换几何方法。如果我使用DotSpatial ReprojectPoints转换一个点,它将正常工作(一旦我为BritishNationalGridOSGB36获
class TestConvert
{
//The standard DotSpatial definition, KnownCoordinateSystems.Projected.NationalGrids.BritishNationalGridOSGB36, is incorrect so needed defined string below
const string BritishNationalGridOsgb36String = "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=446.448,-125.157,542.060,0.1502,0.2470,0.8421,-20.4894 +units=m +no_defs";
readonly ProjectionInfo _britishNationalGridOsgb36 = ProjectionInfo.FromProj4String(BritishNationalGridOsgb36String);
readonly ProjectionInfo _wgs84 = KnownCoordinateSystems.Geographic.World.WGS1984;
[Test]
public void ConvertAPointUsingDotSpatialReproject()
{
//SETUP
var xy = new double[] { 532248.29992272425, 181560.30052819476 };
var z = new double[] { 0 };
//ATTEMPT
Reproject.ReprojectPoints(xy, z,
_britishNationalGridOsgb36, _wgs84, 0, z.Length);
//VERIFY
xy[0].ShouldEqualWithTolerance(-0.095399303, 0.001);
xy[1].ShouldEqualWithTolerance(51.517489, 0.001);
}
[Test]
public void ConvertAPointUsingNetTopologySuiteTransformGeometry()
{
//SETUP
var factory = NetTopologySuite.Geometries.GeometryFactory.Default;
var pointNatGrid = new NetTopologySuite.Geometries.Point(532248.29992272425, 181560.30052819476);
//ATTEMPT
var transform = new DotSpatialMathTransform(
_britishNationalGridOsgb36, _wgs84);
var result = GeometryTransform.TransformGeometry(
factory, pointNatGrid, transform);
//VERIFY
result.GeometryType.ShouldEqual("Point");
result.Coordinates.Count().ShouldEqual(1);
result.Coordinates[0].X.ShouldEqualWithTolerance(-0.095399303, 0.001);
result.Coordinates[0].Y.ShouldEqualWithTolerance(51.517489, 0.001);
}
}
第一个测试通过,第二个测试在两个应满足的公差测试中失败
非常感谢您的帮助。在进一步的研究中,我在NetTopologySuite.CoordinateSystems.Transformation.DotSpatial.Projections代码中发现了一个bug。我报告了,现在已经修复了。有关我发现的问题的详细信息以及已修复的确认信息,请参见此处