public static void getH(string DSMfile, string oriShp)
{
Console.WriteLine("开始提取建筑高度！");
Gdal.AllRegister();
Ogr.RegisterAll();
Stopwatch aTime = new Stopwatch(); aTime.Start();
//创建一个BUFFER，BUFFER距离为1米
string bufShp = bufferFile(oriShp, 1);
//打开原文件和Buffer文件
OSGeo.OGR.Driver dr = Ogr.GetDriverByName("ESRI shapefile");
DataSource oriDs = dr.Open(oriShp, 1);
DataSource bufDs = dr.Open(bufShp, 0);
OSGeo.OGR.Layer bufLayer = bufDs.GetLayerByIndex(0);
OSGeo.OGR.Layer oriLayer = oriDs.GetLayerByIndex(0);
//判断原文件中是否有以下字段，没有就创建
if (oriLayer.FindFieldIndex("MIN", 1) == -1)
{
FieldDefn min = new FieldDefn("MIN", FieldType.OFTReal);
oriLayer.CreateField(min, 1);
}
if (oriLayer.FindFieldIndex("MAX", 1) == -1)
{
FieldDefn max = new FieldDefn("MAX", FieldType.OFTReal);
oriLayer.CreateField(max, 1);
}
if (oriLayer.FindFieldIndex("HIGHT", 1) == -1)
{
FieldDefn hight = new FieldDefn("HIGHT", FieldType.OFTReal);
oriLayer.CreateField(hight, 1);
}
//打开栅格
Dataset dsmDs = Gdal.Open(DSMfile, Access.GA_ReadOnly);
double[] transfrom = new double[6];
dsmDs.GetGeoTransform(transfrom);
int allX = dsmDs.RasterXSize;
int allY = dsmDs.RasterYSize;
//开始计算每个Feature需要读取的栅格参数
int featCount = oriLayer.GetFeatureCount(0);
for (int i = 0; i < featCount; i++)
{
int[] subRasterOff_Size = subRasterInfo(transfrom, allX, allY, bufLayer.GetFeature(i));
Feature oriFeat = oriLayer.GetFeature(i);
Feature bufFeat = bufLayer.GetFeature(i);
getMaxMinValue(dsmDs, oriFeat, bufFeat, subRasterOff_Size);
oriLayer.SetFeature(oriFeat);
oriFeat.Dispose();
Console.WriteLine("当前处理：{0}/{1}", i, featCount);
}
oriLayer.Dispose();
bufLayer.Dispose();
oriDs.Dispose();
bufDs.Dispose();
dsmDs.Dispose();
aTime.Stop();
Console.WriteLine("建筑高度值提取完成！用时：{0}", aTime.Elapsed.ToString());
}
