C#使用gdal环境配置（一）

第一种方式：通过nuget程序包添加，目前最新版本是3.6.3，对.net framework的依赖是461起。

 首先在nuget里面下载gdal.native包

 下载完成之后，会在项目里面生成一个GdalConfiguration.cs文件，配置文件路径。把这个文件里面的代码替换如下：

 public static partial class GdalConfiguration
    {
        private static volatile bool _configuredOgr;
        private static volatile bool _configuredGdal;

        /// <summary>
        /// Function to determine which platform we're on
        /// </summary>
        private static string GetPlatform()
        {
            return IntPtr.Size == 4 ? "x86" : "x64";
        }


        /// <summary>
        /// Construction of Gdal/Ogr
        /// </summary>
        static GdalConfiguration()
        {
            var executingAssemblyFile = new Uri(Assembly.GetExecutingAssembly().GetName().CodeBase).LocalPath;
            var executingDirectory = Path.GetDirectoryName(executingAssemblyFile);

            if (string.IsNullOrEmpty(executingDirectory))
                throw new InvalidOperationException("cannot get executing directory");


            var gdalPath = Path.Combine(executingDirectory, "gdal");
            var nativePath = Path.Combine(gdalPath, GetPlatform());

            // Prepend native path to environment path, to ensure the
            // right libs are being used.
            var path = Environment.GetEnvironmentVariable("PATH");
            path = nativePath + ";" + Path.Combine(nativePath, "plugins") + ";" + path;
            Environment.SetEnvironmentVariable("PATH", path);

            // Set the additional GDAL environment variables.
            var gdalData = Path.Combine(gdalPath, "data");
            Environment.SetEnvironmentVariable("GDAL_DATA", gdalData);
            Gdal.SetConfigOption("GDAL_DATA", gdalData);

            var driverPath = Path.Combine(nativePath, "plugins");
            Environment.SetEnvironmentVariable("GDAL_DRIVER_PATH", driverPath);
            Gdal.SetConfigOption("GDAL_DRIVER_PATH", driverPath);

            Environment.SetEnvironmentVariable("GEOTIFF_CSV", gdalData);
            Gdal.SetConfigOption("GEOTIFF_CSV", gdalData);

            var projSharePath = Path.Combine(gdalPath, "share");
            Environment.SetEnvironmentVariable("PROJ_LIB", projSharePath);
            Gdal.SetConfigOption("PROJ_LIB", projSharePath);
        }

        /// <summary>
        /// Method to ensure the static constructor is being called.
        /// </summary>
        /// <remarks>Be sure to call this function before using Gdal/Ogr/Osr</remarks>
        public static void ConfigureOgr()
        {
            if (_configuredOgr) return;

            // Register drivers
            Ogr.RegisterAll();
            _configuredOgr = true;

            PrintDriversOgr();
        }

        /// <summary>
        /// Method to ensure the static constructor is being called.
        /// </summary>
        /// <remarks>Be sure to call this function before using Gdal/Ogr/Osr</remarks>
        public static void ConfigureGdal()
        {
            if (_configuredGdal) return;

            // Register drivers
            Gdal.AllRegister();
            _configuredGdal = true;

            PrintDriversGdal();
        }

        private static void PrintDriversOgr()
        {
#if DEBUG
            var num = Ogr.GetDriverCount();
            for (var i = 0; i < num; i++)
            {
                var driver = Ogr.GetDriver(i);
                Console.WriteLine(string.Format("OGR {0}: {1}", i, driver.name));
            }
#endif
        }

        private static void PrintDriversGdal()
        {
#if DEBUG
            var num = Gdal.GetDriverCount();
            for (var i = 0; i < num; i++)
            {
                var driver = Gdal.GetDriver(i);
                Console.WriteLine(string.Format("GDAL {0}: {1}-{2}", i, driver.ShortName, driver.LongName));
            }
#endif
        }
    }

测试一下：调用方式

            GdalConfiguration.ConfigureGdal();
            GdalConfiguration.ConfigureOgr();
           // Ogr.RegisterAll();
            Geometry geom = Geometry.CreateFromWkt("POINT(47.0 19.2)");

上面这串调用代码执行通过就算环境配置成功了。

补充一下gdalC#的案例：https://github.com/OSGeo/gdal/blob/master/swig/csharp

官网：https://gdal.org/api/csharp/index.html