ArcGis 获取地理、平面坐标系

最新推荐文章于 2020-05-15 11:46:46 发布

转载最新推荐文章于 2020-05-15 11:46:46 发布 · 251 阅读

1 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/94cool/p/4323370.html

本文介绍了一种通过Shapefile获取投影坐标系统的方法，并演示了如何使用ArcGIS API从.shp文件对应的.prj文件中读取投影信息，同时提供了创建自定义投影坐标系统的示例。

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1 IProjectedCoordinateSystem LoadProjectedCoordinateSystem(string shpfile)
2         {
3             /*  IFeatureClass从中获取地理坐标、平面坐标
4             string shpDir = System.IO.Path.GetDirectoryName(shpfile);
5             string shpfilename = System.IO.Path.GetFileName(shpfile);
6             IWorkspaceFactory wsFactory = new ShapefileWorkspaceFactoryClass();
7             IWorkspace ws = wsFactory.OpenFromFile(shpDir, 0);
8             IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)ws;
9             IFeatureClass featureCls = featureWorkspace.OpenFeatureClass(shpfilename);
10             IGeoDataset pGeoDataset = featureCls as IGeoDataset;
11             var spatialReference = pGeoDataset.SpatialReference;
12
13             IProjectedCoordinateSystem pProCoordSys = spatialReference as IProjectedCoordinateSystem;//平面
14             IGeographicCoordinateSystem pGeographCoordinateSys = pProCoordSys.GeographicCoordinateSystem;//地理
15             */
16
17
18             //1、从文件中获取
19             ESRI.ArcGIS.Geometry.ISpatialReferenceFactory spatialRefFactory = new ESRI.ArcGIS.Geometry.SpatialReferenceEnvironmentClass();
20             ESRI.ArcGIS.Geometry.ISpatialReference spatialReference = spatialRefFactory.CreateESRISpatialReferenceFromPRJFile(shpfile.ToLower().Replace(".shp", ".prj"));
21
22             //2、自定义
23             IProjectedCoordinateSystem geographicCoordinateSystem = spatialRefFactory.CreateProjectedCoordinateSystem((int)ESRI.ArcGIS.Geometry.esriSRProjCSType.esriSRProjCS_World_Mercator);
24
25             //3、从文件中获取
26             Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
27             System.Object obj = Activator.CreateInstance(factoryType);
28             ISpatialReferenceFactory spatialReferenceFactory = obj as ISpatialReferenceFactory;
29
30             IProjectedCoordinateSystem projectedCoordinateSystem = spatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(shpfile.ToLower().Replace(".shp", ".prj")) as IProjectedCoordinateSystem;
31             return projectedCoordinateSystem;
32
33         }

转载于:https://www.cnblogs.com/94cool/p/4323370.html