public void LoadAffineTransform(string filename)
{
using (OSGeo.GDAL.Dataset dataset = OSGeo.GDAL.Gdal.Open(filename, OSGeo.GDAL.Access.GA_ReadOnly))
{
AffineTransform = new double[6];
dataset.GetGeoTransform(AffineTransform);
string targetProjection = "GEOGCS[\"Moon 2000\", DATUM[\"D_Moon_2000\", SPHEROID[\"Moon_2000_IAU_IAG\",1737400.0,0.0]], PRIMEM[\"Greenwich\",0], UNIT[\"Decimal_Degree\",0.0174532925199433]]";
var src = new OSGeo.OSR.SpatialReference(dataset.GetProjectionRef());
var dst = new OSGeo.OSR.SpatialReference(targetProjection);
pixelToLatLon = new OSGeo.OSR.CoordinateTransformation(src, dst);
latLonToPixel = new OSGeo.OSR.CoordinateTransformation(dst, src);
}
}
public MemoryMappedInt16Terrain(string referenceImage)
{
Open(TerrainImageFile);
using (OSGeo.GDAL.Dataset dataset = OSGeo.GDAL.Gdal.Open(referenceImage, OSGeo.GDAL.Access.GA_ReadOnly))
{
_affineTransform = new double[6];
dataset.GetGeoTransform(_affineTransform);
string projection = dataset.GetProjectionRef();
var src = new OSGeo.OSR.SpatialReference(projection);
var dst = new OSGeo.OSR.SpatialReference(PolarStereographic);
_pixelToLineSample = new OSGeo.OSR.CoordinateTransformation(src, dst);
}
}
/// <summary>
/// 获取等高线
/// </summary>
/// <returns></returns>
static OSGeo.OGR.Layer getDZX_()
{
StaticTools.msgLine("createDZX...");
//分析数据源
double noDataValue; //无效值
int hasDataValue; //0不使用无效值,1使用无效值
dsmDataset.GetRasterBand(1).GetNoDataValue(out noDataValue, out hasDataValue);
//WKT
string wkt = dsmDataset.GetProjectionRef();
OSGeo.OSR.SpatialReference srs = wkt == "" ? null : new OSGeo.OSR.SpatialReference(wkt);
//图像值属性，最大值、最小值、平均值
double min, max, mean, std;
dsmDataset.GetRasterBand(1).GetStatistics(0, 1, out min, out max, out mean, out std);
//计算每级线的值，加0.5是确保取到最接近的整数，不被四舍五入
int count = Convert.ToInt32((max - min) / jianG + 0.5);
double[] shu = new double[count];
for (int i = 0; i < count; i++)
{
shu[i] = min + jianG * i;
}
//创建空的SHP，准备塞入数据
shpDataSet.deleteLayerByName("dzx");
OSGeo.OGR.Layer dzxLayer = shpDataSet.CreateLayer("dzx", srs, OSGeo.OGR.wkbGeometryType.wkbMultiLineString, null);
//必须有这两个字段，函数要往里塞值，其实没毛用
OSGeo.OGR.FieldDefn fieldDf0 = new OSGeo.OGR.FieldDefn("LID", OSGeo.OGR.FieldType.OFTInteger);
OSGeo.OGR.FieldDefn fieldDf1 = new OSGeo.OGR.FieldDefn("EVE", OSGeo.OGR.FieldType.OFTReal);
dzxLayer.CreateField(fieldDf0, 1); //ID
dzxLayer.CreateField(fieldDf1, 1); //Value
//Band(1), 间隔, 起始高度, 分段数量, 分段值数组, 是否有无效值, 无效值, 预置图层. ID字段, 高度值字段, null , null
OSGeo.GDAL.Gdal.ContourGenerate(dsmDataset.GetRasterBand(1), jianG, min, count, shu, hasDataValue, noDataValue, dzxLayer, 0, 1, null, null);
if (dzxLayer.GetFeatureCount(0) > 0)
{
return(dzxLayer);
}
else
{
return(null);
}
}
private List <double[]> readImageCoordinatesBoundsInLonLat(OSGeo.GDAL.Dataset imageDataset)
{
var band = imageDataset.GetRasterBand(1);
if (band == null)
{
return(null);
}
var width = band.XSize;
var height = band.YSize;
double[] geoTransformerData = new double[6];
imageDataset.GetGeoTransform(geoTransformerData);
SpatialReference currentReference = new SpatialReference(imageDataset.GetProjectionRef());
SpatialReference newReference = GdalUtilities.getWgs84Reference();
CoordinateTransformation ct = new CoordinateTransformation(currentReference, newReference);
double[] northWestPoint = new double[2] {
geoTransformerData[0], geoTransformerData[3]
};
ct.TransformPoint(northWestPoint);
double[] southEastPoint = new double[2] {
geoTransformerData[0] + geoTransformerData[1] * width,
geoTransformerData[3] + geoTransformerData[5] * height
};
ct.TransformPoint(southEastPoint);
return(new List <double[]> {
northWestPoint, southEastPoint
});
}
static void Main(string[] args)
{
OSGeo.GDAL.Gdal.AllRegister();
OSGeo.OGR.Ogr.RegisterAll();
//shp驱动
OSGeo.OGR.Driver shpDataDriver = OSGeo.OGR.Ogr.GetDriverByName("ESRI shapefile");
//shp数据源
shpDataSet = shpDataDriver.CreateDataSource(shpSavePath, null);
//img驱动
gdalDriver = OSGeo.GDAL.Gdal.GetDriverByName("HFA");
//dsm数据源
dsmDataset = OSGeo.GDAL.Gdal.Open(dsmPath, OSGeo.GDAL.Access.GA_Update);
//dsm数据信息
dsmDataset.GetGeoTransform(dsm_Transform);
dsm_Xsize = dsmDataset.RasterXSize;
dsm_Ysize = dsmDataset.RasterYSize;
//投影信息
srs = dsmDataset.GetProjectionRef() == "" ? null : new OSGeo.OSR.SpatialReference(dsmDataset.GetProjectionRef());
Stopwatch aTime = new Stopwatch(); aTime.Start();
//1 坡度图
buildSlope();
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
//2 坡度线
OSGeo.OGR.Layer pdx = getPDX(1);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
OSGeo.OGR.Layer slopeCleanLayer = cleanLayer(pdx, 200, 5000);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
//3 等高线
OSGeo.OGR.Layer dzx = getDZX_();
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
OSGeo.OGR.Layer dzxPolyLayer = cleanDZX(dzx);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
//4 筛选
OSGeo.OGR.Layer selectLayer = selectionFeatuers(slopeCleanLayer, dzxPolyLayer);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
OSGeo.OGR.Layer resLayer = cleanLayer_FF(selectLayer);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
// 最小外接矩形
getMinOutLineFromLayerToLayer(resLayer);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
//5 简化
jianhua(resLayer, 175, 5);
StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
//6 高度值 未完成
//getH(resLayer);
//StaticTools.msgLine($"完成！用时：{aTime.Elapsed.ToString()}\n"); aTime.Restart();
shpDataSet.Dispose();
shpDataDriver.Dispose();
dsmDataset.Dispose();
gdalDriver.Dispose();
// aTime.Stop();
Console.Write("Press any key to continue . . . ");
Console.ReadKey(true);
}
