Arcgis Engine矢量裁剪栅格，调用Mask工具相关代码
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今天试了下arcgis 矢量裁剪栅格，首先在arcmap上面操作，发现有好几种方式都能实现：
方法1，矢量转栅格，把像元值设置1(方法是添加一个字段，将字段值全部赋值1）然后调用toolbox的时候，选择该字段；这样就生成了一个所有cell的值为1的栅格RasterA。
接下来，将RasterA与我们要裁剪的栅格对象RasterB进行栅格计算(栅格计算也用toolbox里面的，不要用菜单里面的，因为我们最后代码里面调用的是toolbox)，将RasterA*RasterB就是最终结果啦。
方法2，和方法1的区别就是，不用添加字段，而是重分类一下，Reclassify重分类，将某个字段的值重分类为1。
方法3，也是最屌的方法，直接用Extract by Polygon工具。
3种方法区别：
方法1和方法2算是同一种，他们比方法3稳定，因为他们只是单纯栅格计算，在大数据量的时候比较靠谱。方法3虽然简单，但面对大数据量处理的时候，容易出错，不太稳定。当然小数据的话，还是木有问题的。
下边直接贴代码啦，简单的封装了一个类
using System;using System.Collections.Generic;using System.Linq;using System.Text;using ESRI.ArcGIS.Geodatabase;using ESRI.ArcGIS.Geometry;using ESRI.ArcGIS.Geoprocessor;using ESRI.ArcGIS.Geoprocessing;using ESRI.ArcGIS.esriSystem;using ESRI.ArcGIS.SpatialAnalystTools;using ESRI.ArcGIS.SpatialAnalyst;using ESRI.ArcGIS.DataSourcesRaster;using ESRI.ArcGIS.Carto;using ESRI.ArcGIS.DataSourcesGDB;namespace GPOperator{ public class ClipHelper : GPTool { /// <summary> /// 栅格裁剪 /// </summary> /// <param name="inputRaster">要裁剪的栅格(支持对象和栅格文件路径)</param> /// <param name="maskData">掩膜数据(支持对象和shp文件路径)</param> /// <returns></returns> public IGeoDataset ClipRaster2(object inputRaster, object maskData, out string resultInfo) { string outRaster = System.IO.Path.Combine(System.IO.Path.GetTempPath(), "ClipRaster_" +DateTime.Now.ToString("yyyy-MM-dd HH-mm-ss")+ Guid.NewGuid().ToString("D").Substring(0,4) + ".tif"); //参数：对象或路径都支持 ESRI.ArcGIS.SpatialAnalystTools.ExtractByMask mask = new ESRI.ArcGIS.SpatialAnalystTools.ExtractByMask(inputRaster, maskData, outRaster);//@"C:\tmp\新建文件夹\ret.tif" bool isok = this.Excute(mask, out resultInfo); //IWorkspaceFactory wsf = new RasterWorkspaceFactory(); //IRasterWorkspace rasterWS = wsf.OpenFromFile(System.IO.Path.GetDirectoryName(outRaster), 0) as IRasterWorkspace; //IRasterDataset rds = rasterWS.OpenRasterDataset(System.IO.Path.GetFileName(outRaster)); IRasterDataset rasterDataset = new RasterDataset(); rasterDataset.OpenFromFile(outRaster); return rasterDataset as IGeoDataset; } /// <summary> /// 栅格裁剪 /// </summary> /// <param name="inputRaster">要裁剪的栅格(支持对象和栅格文件路径)</param> /// <param name="maskData">裁剪多边形</param> /// <returns>裁剪得到的栅格</returns> public IGeoDataset ClipRaster(object inputRaster, IPolygon polygon, out string resultInfo) { var maskData = CreateFeatureClass(polygon); string outRaster = System.IO.Path.Combine(System.IO.Path.GetTempPath(), "ClipRaster_" + DateTime.Now.ToString("yyyy-MM-dd HH-mm-ss") + Guid.NewGuid().ToString("D").Substring(0, 4) + ".tif"); ESRI.ArcGIS.SpatialAnalystTools.ExtractByMask mask = new ESRI.ArcGIS.SpatialAnalystTools.ExtractByMask(inputRaster, maskData, outRaster); if (this.Excute(mask, out resultInfo)) { return null; } IRasterDataset rasterDataset = new RasterDataset(); try { rasterDataset.OpenFromFile(outRaster); } catch (Exception ex) { resultInfo = ex.ToString(); return null; } finally { try { ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(maskData); } catch { } } return rasterDataset as IGeoDataset; } /// <summary> /// 栅格裁剪 /// Op方法，直接返回对象 /// </summary> /// <param name="inputRaster">要裁剪的栅格</param> /// <param name="maskData">掩膜数据</param> /// <returns></returns> public IGeoDataset ClipRaster3(IGeoDataset inputRaster, IGeoDataset maskData,out string resultInfo) { resultInfo = "执行成功"; IExtractionOp2 op = new RasterExtractionOpClass(); try { return op.Raster(inputRaster, maskData); } catch (Exception ex) { resultInfo = ex.ToString(); return null; } } public IFeatureClass CreateFeatureClass(IPolygon polygon) { IFeatureClassDescription fcDescription = new FeatureClassDescriptionClass(); IObjectClassDescription ocDescription = (IObjectClassDescription)fcDescription; IFeatureClass fc= createFeatureClassInmemeory("temp", "temp", polygon.SpatialReference, esriGeometryType.esriGeometryPolygon, ocDescription.RequiredFields); if (null == fc) { return null; } IFeature f= fc.CreateFeature(); f.Shape = polygon; f.Store(); return fc; } //IFeatureCache /// <summary> /// 在内存中创建临时要素类 /// </summary> /// <param name="DataSetName">数据集名称</param> /// <param name="AliaseName">别名</param> /// <param name="SpatialRef">空间参考</param> /// <param name="GeometryType">几何类型</param> /// <param name="PropertyFields">属性字段集合</param> /// <returns>IfeatureLayer</returns> private IFeatureClass createFeatureClassInmemeory(string DataSetName, string AliaseName, ISpatialReference SpatialRef, esriGeometryType GeometryType, IFields PropertyFields) { IWorkspaceFactory workspaceFactory = new InMemoryWorkspaceFactoryClass(); ESRI.ArcGIS.Geodatabase.IWorkspaceName workspaceName = workspaceFactory.Create("", "MyWorkspace", null, 0); ESRI.ArcGIS.esriSystem.IName name = (IName)workspaceName; ESRI.ArcGIS.Geodatabase.IWorkspace inmemWor = (IWorkspace)name.Open(); IField oField = new FieldClass(); IFields oFields = new FieldsClass(); IFieldsEdit oFieldsEdit = null; IFieldEdit oFieldEdit = null; IFeatureClass oFeatureClass = null; try { oFieldsEdit = oFields as IFieldsEdit; oFieldEdit = oField as IFieldEdit; for (int i = 0; i < PropertyFields.FieldCount; i++) { IField field = PropertyFields.get_Field(i); if (field.Type != esriFieldType.esriFieldTypeGeometry) { oFieldsEdit.AddField(field); } } IGeometryDef geometryDef = new GeometryDefClass(); IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef; geometryDefEdit.AvgNumPoints_2 = 5; geometryDefEdit.GeometryType_2 = GeometryType; geometryDefEdit.GridCount_2 = 1; geometryDefEdit.HasM_2 = false; geometryDefEdit.HasZ_2 = false; geometryDefEdit.SpatialReference_2 = SpatialRef; oFieldEdit.Name_2 = "SHAPE"; oFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry; oFieldEdit.GeometryDef_2 = geometryDef; oFieldEdit.IsNullable_2 = true; oFieldEdit.Required_2 = true; oFieldsEdit.AddField(oField); oFeatureClass = (inmemWor as IFeatureWorkspace).CreateFeatureClass(DataSetName, oFields, null, null, esriFeatureType.esriFTSimple, "SHAPE", ""); (oFeatureClass as IDataset).BrowseName = DataSetName; return oFeatureClass; } catch(Exception ex) { return null; } } } /// <summary> /// GP工具基类，实现执行工具公共方法和释放资源方法的定义。 /// </summary> public class GPTool { private Geoprocessor gp = null; private IGeoProcessorResult gpResult = null; public GPTool() { gp = new Geoprocessor(); gp.OverwriteOutput = true; } /// <summary> /// 释放资源 /// </summary> public void Release() { if (gp != null) { ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(gp); gp = null; } if (gpResult != null) { ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(gpResult); gpResult = null; } } /// <summary> /// 执行已定义参数的GP工具。 /// </summary> protected bool Excute(IGPProcess gpProcess, out string resultInfo) { resultInfo = "执行成功"; gpResult = (IGeoProcessorResult)gp.Execute(gpProcess, null); if (gpResult == null || gpResult.Status != esriJobStatus.esriJobSucceeded) { // 执行错误，输入错误报告。 StringBuilder message = new StringBuilder(gpProcess.ToolName); for (int i = 0; i < gp.MessageCount; i++) { message.AppendLine(gp.GetMessage(i)); } resultInfo = message.ToString(); return false; } ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(gpProcess); return true; } }}下边是调用代码：
using System;using System.Collections.Generic;using System.Linq;using System.Text;using ESRI.ArcGIS.esriSystem;using GPOperator;using ESRI.ArcGIS.DataSourcesRaster;using ESRI.ArcGIS.Geodatabase;using ESRI.ArcGIS.DataSourcesFile;using ESRI.ArcGIS.Geometry;namespace ConsoleApplication1{ class Program { private static LicenseInitializer m_AOLicenseInitializer = new ConsoleApplication1.LicenseInitializer(); static void Main(string[] args) { //ESRI License Initializer generated code. m_AOLicenseInitializer.InitializeApplication(new esriLicenseProductCode[] { esriLicenseProductCode.esriLicenseProductCodeBasic, esriLicenseProductCode.esriLicenseProductCodeAdvanced }, new esriLicenseExtensionCode[] { esriLicenseExtensionCode.esriLicenseExtensionCodeNetwork, esriLicenseExtensionCode.esriLicenseExtensionCodeSpatialAnalyst, esriLicenseExtensionCode.esriLicenseExtensionCodeSchematics, esriLicenseExtensionCode.esriLicenseExtensionCodeMLE, esriLicenseExtensionCode.esriLicenseExtensionCodeDataInteroperability, esriLicenseExtensionCode.esriLicenseExtensionCodeTracking, esriLicenseExtensionCode.esriLicenseExtensionCodeArcScan, esriLicenseExtensionCode.esriLicenseExtensionCodeBusiness, esriLicenseExtensionCode.esriLicenseExtensionCodeCOGO, esriLicenseExtensionCode.esriLicenseExtensionCodeGeoStats, esriLicenseExtensionCode.esriLicenseExtensionCodePublisher }); //ESRI License Initializer generated code. test(); //Do not make any call to ArcObjects after ShutDownApplication() m_AOLicenseInitializer.ShutdownApplication(); } public static void test() { //准备数据 string polygon = @"D:\quickly\其它\矢量裁剪栅格\shp\LD.shp"; string inputRastger = @"D:\quickly\其它\矢量裁剪栅格\temp\risk11.tif"; ClipHelper c = new ClipHelper();//必须要在打开栅格之前调用，不然打开栅格会出错，还不知道原因。 string errInfo = ""; IRasterDataset rasterDataset = new RasterDataset(); rasterDataset.OpenFromFile(inputRastger); IWorkspaceFactory wsf = new ShapefileWorkspaceFactory(); IFeatureWorkspace fws = wsf.OpenFromFile(System.IO.Path.GetDirectoryName(polygon), 0) as IFeatureWorkspace; IFeatureClass f = fws.OpenFeatureClass("LD"); var feat = f.Search(null, false).NextFeature(); var ret = c.ClipRaster(rasterDataset, feat.Shape as IPolygon, out errInfo); } }} 0 0
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