c# - 在GDAL（C＃）中将点几何添加到shapefile

问题描述

我正在尝试使用 GDAL 制作具有点几何形状的 shapefile。我正在按照此处给出的示例进行操作。我正在使用 Microsoft Visual Studio，编程语言是 C#。现在，我只是在原点做一个点，我正在 QGIS 中查看生成的 shapefile。出于某种原因，我无法看到我提出的观点。我也尝试过制作多边形，但我面临同样的问题。下面是我写的代码：

        public void testSF(Dataset ds)
        {
        Console.WriteLine("Writing ERSI shapefile");
        // Registering drivers
        OSGeo.OGR.Ogr.RegisterAll();
        OSGeo.OGR.Driver driverSH = OSGeo.OGR.Ogr.GetDriverByName("ESRI Shapefile");

        if (driverSH == null)
        {
            Console.WriteLine("Cannot get drivers. Exiting");
            System.Environment.Exit(-1);
        }
        Console.WriteLine("Drivers fetched");

        // Creating a shapefile
        OSGeo.OGR.DataSource dataSourceSH = driverSH.CreateDataSource("ERSI_TEST_ShapeFile.shp", new string[] { });
        if (dataSourceSH == null)
        {
            Console.WriteLine("Cannot create datasource");
            System.Environment.Exit(-1);
        }
        Console.WriteLine("Shapefile created");

        // Creating a point layer
        OSGeo.OGR.Layer layerSH;
        layerSH = dataSourceSH.CreateLayer("PolygonLayer", null, OSGeo.OGR.wkbGeometryType.wkbPoint, new string[] { });
        if (layerSH == null)
        {
            Console.WriteLine("Layer creation failed, exiting...");
            System.Environment.Exit(-1);
        }
        Console.WriteLine("Polygon Layer created");

        // Creating and adding attribute fields to layer
        OSGeo.OGR.FieldDefn fdefnName = new OSGeo.OGR.FieldDefn("Name", OSGeo.OGR.FieldType.OFTString);
        fdefnName.SetWidth(32);

        OSGeo.OGR.FieldDefn fdefnGPS = new OSGeo.OGR.FieldDefn("GPS", OSGeo.OGR.FieldType.OFTString);
        fdefnGPS.SetWidth(32);

        if (layerSH.CreateField(fdefnName, 1) != 0)
        {
            Console.WriteLine("Creating Name field failed");
            System.Environment.Exit(-1);
        }

        if (layerSH.CreateField(fdefnGPS, 1) != 0)
        {
            Console.WriteLine("Creating GPS field failed");
            System.Environment.Exit(-1);
        }

        Console.WriteLine("Fields created and added to layer");
        OSGeo.OGR.Feature featureSH = new OSGeo.OGR.Feature(layerSH.GetLayerDefn());
        featureSH.SetField("Name", "This is a NAME");
        featureSH.SetField("GPS", "Test GPS point");

        // Outer Ring 
        // Methodology: Create a linear ring geometry, add it to a polygon geometry. Add polygon geometry to feature. Add feature to layer

        OSGeo.OGR.Feature feature = new OSGeo.OGR.Feature( layerSH.GetLayerDefn() );
        OSGeo.OGR.Geometry geom = OSGeo.OGR.Geometry.CreateFromWkt("POINT(0.0 0.0)");

        feature.SetGeometry(geom);
        layerSH.CreateFeature(feature);
}

此代码在 0.0 和 0.0 处向多边形层添加一个点。但是，当我在 QGIS 中打开生成的图层时，我看不到/定位该点。任何帮助，将不胜感激。

标签： c#shapefilegdalqgis

c# - 在GDAL（C＃）中将点几何添加到shapefile

问题描述

解决方案

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