AE设置投影而非重投影IGeoDatasetSchemaEdit

 AE设置投影而非重投影

读取一个jpg格式的影像，包含jgw文件，这时设置投影。赋值操作。

IRasterDataset raster = rasterWsp.OpenRasterDataset(FileName);
//AE设置投影为WebMercator投影
IGeoDatasetSchemaEdit schemeEdit = raster as IGeoDatasetSchemaEdit;
 if (schemeEdit.CanAlterSpatialReference)
{
          schemeEdit.AlterSpatialReference(webMercator);
}

 构建webMercator投影：

 //创建WGS84辅助球Web墨卡托投影
        public ISpatialReference CreateWebMector()
        {
            // 实例化SpatialReferenceEnvironment.SpatialReferenceEnvironment
            Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
            System.Object obj = Activator.CreateInstance(factoryType);
            ISpatialReferenceFactory3 mSpatialReferenceFactory3 = obj as ISpatialReferenceFactory3;
            ISpatialReference projSpatialReference = mSpatialReferenceFactory3.CreateProjectedCoordinateSystem((int)esriSRProjCS3Type.esriSRProjCS_WGS1984WebMercatorMajorAuxSphere);//基于WGS84的WebMercator
            //esriSRProjCS2Type.esriSRProjCS_WGS1984WorldMercator);
            //esriSRProjCS3Type.esriSRProjCS_WGS1984WebMercatorMajorAuxSphere);
            //esriSRProjCS2Type.esriSRProjCS_WGS1984SphereWebMercator
            return projSpatialReference;
        }