下面代码演示了Map 3D API中如何计算两点间的地球大圆距离和欧几里得距离，直接看代码：
[CommandMethod("ComputeDistance")] public void ComputeDistance() { double x1 = -87.7104750022991; double y1 = 43.7017449116101; double x2 = -87.703061972587; double y2 = 43.7016702994388; Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor; //Get coordinate system of current map AcMapMap currentMap = AcMapMap.GetCurrentMap(); string srsWkt = currentMap.GetMapSRS(); //ed.WriteMessage("srs = " + srsWkt + "\n"); MgCoordinateSystemFactory coordSysFactory = new MgCoordinateSystemFactory(); MgCoordinateSystem coordSys = coordSysFactory.Create(srsWkt); //compute gread circle distance double distance = coordSys.MeasureGreatCircleDistance(x1, y1, x2, y2); distance = coordSys.ConvertCoordinateSystemUnitsToMeters(distance); ed.WriteMessage("gread circle dist = " + distance.ToString() + "\n"); //compute Euclidean distance distance = coordSys.MeasureEuclideanDistance(x1, y1, x2, y2); distance = coordSys.ConvertCoordinateSystemUnitsToMeters(distance); ed.WriteMessage("Euclidean distance = " + distance.ToString() + "\n"); //Another method, compute the distance from Newyork to Boston MgCoordinateSystemMeasure coordSysMeasure = coordSys.GetMeasure(); double dist = coordSysMeasure.GetDistance(-74.806394, 40.714169, -71.061342, 42.355892); dist = coordSys.ConvertCoordinateSystemUnitsToMeters(dist); ed.WriteMessage(" distance = " + dist.ToString() + "\n"); }
核心代码在MapGuide中也适用。
本文转自峻祁连. Moving to Cloud/Mobile博客园博客，原文链接：http://www.cnblogs.com/junqilian/archive/2011/08/29/2158329.html
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