public void WriterRasterResult(string nFileName, ResultInfo resultInfo)
{
try
{
_fileName = nFileName;
_resultInfo = resultInfo;
OSGeo.GDAL.Gdal.AllRegister();
OSGeo.GDAL.Driver nDriver = OSGeo.GDAL.Gdal.GetDriverByName("GTiff");
double[] inGeo = _resultInfo.InGeo;
string[] strs = new string[] { "INTERLEAVE = PIXEL" };
string prjWGS84 = "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"912\"]],AUTHORITY[\"EPSG\",\"4326\"]]";
_dataSet = nDriver.Create(_fileName,
_resultInfo.Width,
_resultInfo.Height,
1,
OSGeo.GDAL.DataType.GDT_Byte,
strs);
_pixels1 = new double[_resultInfo.Width * _resultInfo.Height];
_dataSet.SetGeoTransform(inGeo);
_dataSet.SetProjection(prjWGS84);
_dataSet.Dispose();
}
catch (System.Exception err)
{
throw new Exception("数据写入失败。" + err.Message);
}
}
/// <summary>
/// 拷贝元数据至新的数据集。
/// </summary>
/// <param name="InputDS">输入的数据集。</param>
/// <param name="TargetDS">要将元数据拷贝到的数据集。</param>
public static void CopyMetadata(OSGeo.GDAL.Dataset InputDS, OSGeo.GDAL.Dataset TargetDS)
{
if (InputDS == null || TargetDS == null)
{
throw new ArgumentNullException("数据集不能为空。");
}
//写入投影和变换信息
double[] TransformArgs = new double[6];
InputDS.GetGeoTransform(TransformArgs);
TargetDS.SetGeoTransform(TransformArgs);
TargetDS.SetProjection(InputDS.GetProjection());
//DS.SetMetadata(InputDS.GetMetadata());
}
/// <summary>
/// 切分图像||
/// 解决图像过大导致的计算缓慢||
/// 输入图像路径，输出分幅路径||
/// 重叠区根据图像分辨率确定，约为实地100~200米
/// </summary>
/// <param name="inPaht"></param>
/// <returns></returns>
public static List <string> getSubImg(string inPaht)
{
//注册插件
OSGeo.GDAL.Gdal.AllRegister();
OSGeo.GDAL.Driver gdalDriver = OSGeo.GDAL.Gdal.GetDriverByName("HFA");
//读进数据
OSGeo.GDAL.Dataset inDS = OSGeo.GDAL.Gdal.Open(inPaht, OSGeo.GDAL.Access.GA_ReadOnly);
//根据栅格分辨率确定重叠区大小
double[] dsTraansform = new double[6];
inDS.GetGeoTransform(dsTraansform);
if (dsTraansform[1] < 0.16)
{
xBuf = 1000; yBuf = 1000;
} //1000*0.1=>100M
if (dsTraansform[1] < 0.3)
{
xBuf = 500; yBuf = 500;
} //500*0.25=>125M
else if (dsTraansform[1] < 0.6)
{
xBuf = 300; yBuf = 300;
} //300*0.5=>150M
else if (dsTraansform[1] < 1.1)
{
xBuf = 200; yBuf = 150;
} //150*1=>200M
else if (dsTraansform[1] < 2.1)
{
xBuf = 100; yBuf = 100;
} //100*2=>200M
else
{
xBuf = 50; yBuf = 50;
} //50*5=>250M
//获取数据XY相元数量
int oriXcount = inDS.RasterXSize;
int oriYcount = inDS.RasterYSize;
//用来返回的文件路径列表
List <string> imgFilePaths = new List <string>();
if (oriXcount > userSetX || oriYcount > userSetY)
{
//确定文件行列数
int u, v;
u = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(oriXcount) / userSetX)); //行文件数
v = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(oriYcount) / userSetY)); //列文件数
//循环列
for (int i = 0; i < v; i++)
{
//循环行
for (int j = 0; j < u; j++)
{
//////////// 定义起点 /////////////
int offX = j * userSetX;
int offY = i * userSetY;
//////////////定义边缘栅格大小/////////////////
int thinkJ = userSetX * (j + 1) + xBuf;
int thinkI = userSetY * (i + 1) + yBuf;
int subXcount = oriXcount - thinkJ > 0 ? userSetX + xBuf : oriXcount - userSetX * j;
int subYcount = oriYcount - thinkI > 0 ? userSetY + yBuf : oriYcount - userSetY * i;
//////////// 把原栅格读进内存，内容为oriValue /////////////
OSGeo.GDAL.Band oriBand = inDS.GetRasterBand(1);
double[] oriValue = new double[subXcount * subYcount];
oriBand.ReadRaster
(
offX, //起点X索引
offY, //起点Y索引
subXcount, //X方向相元数量
subYcount, //Y方向相元数量
oriValue, //各相元值
subXcount, //执行读入的X方向数量
subYcount, //执行读入的Y方向数量
0, //执行读入的起点X索引
0 //执行读入的起点Y索引
);
//////////// 创建子栅格 /////////////
string imgFilePath = StaticTools.tempFilePath("img", i.ToString() + "_" + j.ToString());
OSGeo.GDAL.Dataset subDs = gdalDriver.Create
(
imgFilePath,
subXcount,
subYcount,
1,
OSGeo.GDAL.DataType.GDT_Float32,
null
);
subDs.SetProjection(inDS.GetProjectionRef());
//获取数据Transfrom
double[] oriTransFrom = new double[6];
inDS.GetGeoTransform(oriTransFrom);
oriTransFrom[0] = oriTransFrom[0] + offX * oriTransFrom[1] + offY * oriTransFrom[2];
oriTransFrom[3] = oriTransFrom[3] + offX * oriTransFrom[4] + offY * oriTransFrom[5];
subDs.SetGeoTransform(oriTransFrom);
//////////// 把值写入子栅格 /////////////
subDs.GetRasterBand(1).WriteRaster
(
0,
0,
subXcount,
subYcount,
oriValue,
subXcount,
subYcount,
0,
0
);
///////////////// 返回子栅格路径 ////////////////////
imgFilePaths.Add(imgFilePath);
subDs.Dispose();
}
}
}
else
{
imgFilePaths.Add(inPaht);
}
inDS.Dispose();
return(imgFilePaths);
}
public static void ConvertFeatureToRaster(Layer layer, out Dataset outputDataset, double rasterCellSize, string fieldName)
{
DriverUtils.RegisterGdalOgrDrivers();
Envelope envelope = new Envelope();
layer.GetExtent(envelope, 0);
//Compute the out raster cell resolutions
int x_res = Convert.ToInt32((envelope.MaxX - envelope.MinX) / rasterCellSize);
int y_res = Convert.ToInt32((envelope.MaxY - envelope.MinY) / rasterCellSize);
//Console.WriteLine("Extent: " + envelope.MaxX + " " + envelope.MinX + " " + envelope.MaxY + " " + envelope.MinY);
//Console.WriteLine("X resolution: " + x_res);
//Console.WriteLine("X resolution: " + y_res);
//Create new tiff in disk
string tempRaster = "tempZoneRaster.tif";
if (File.Exists(tempRaster))
{
File.Delete(tempRaster);
}
OSGeo.GDAL.Driver outputDriver = Gdal.GetDriverByName("GTiff");
outputDataset = outputDriver.Create(tempRaster, x_res, y_res, 1, DataType.GDT_Int32, null);
//Extrac srs from input feature
string inputShapeSrs;
SpatialReference spatialRefrence = layer.GetSpatialRef();
spatialRefrence.ExportToWkt(out inputShapeSrs);
//Assign input feature srs to outpur raster
outputDataset.SetProjection(inputShapeSrs);
//Geotransform
double[] argin = new double[] { envelope.MinX, rasterCellSize, 0, envelope.MaxY, 0, -rasterCellSize };
outputDataset.SetGeoTransform(argin);
//Set no data
Band band = outputDataset.GetRasterBand(1);
//band.SetNoDataValue(GdalUtilConstants.NoDataValue);
band.Fill(GdalUtilConstants.NoDataValue, 0.0);
//Feature to raster rasterize layer options
//No of bands (1)
int[] bandlist = new int[] { 1 };
//Values to be burn on raster (10.0)
double[] burnValues = new double[] { 10.0 };
//Dataset myDataset = Gdal.Open(outputRasterFile, Access.GA_Update);
//additional options
string[] rasterizeOptions;
//rasterizeOptions = new string[] { "ALL_TOUCHED=TRUE", "ATTRIBUTE=" + fieldName }; //To set all touched pixels into raster pixel
rasterizeOptions = new string[] { "ATTRIBUTE=" + fieldName };
//Rasterize layer
//Gdal.RasterizeLayer(myDataset, 1, bandlist, layer, IntPtr.Zero, IntPtr.Zero, 1, burnValues, null, null, null); // To burn the given burn values instead of feature attributes
//Gdal.RasterizeLayer(outputDataset, 1, bandlist, layer, IntPtr.Zero, IntPtr.Zero, 1, burnValues, rasterizeOptions, new Gdal.GDALProgressFuncDelegate(ProgressFunc), "Raster conversion");
Gdal.RasterizeLayer(outputDataset, 1, bandlist, layer, IntPtr.Zero, IntPtr.Zero, 1, burnValues, rasterizeOptions, null, null);
}
