/// <summary>
/// Gdal to DotSpatial at Raster Level
/// </summary>
/// <param name="dataset">Gdal Dataset</param>
/// <param name="bandIndex">Index of Band</param>
/// <returns>Dotspatial Raster</returns>
public static DotSpatial.Data.IRaster Gdal2DSRaster(OSGeo.GDAL.Dataset dataset, int bandIndex)
{
DotSpatial.Data.IRaster result = null;
OSGeo.GDAL.Band band = dataset.GetRasterBand(bandIndex);
if (dataset != null)
{
switch (band.DataType)
{
case OSGeo.GDAL.DataType.GDT_Byte:
result = new GdalRaster <byte>(dataset, band);
break;
case OSGeo.GDAL.DataType.GDT_CFloat32:
case OSGeo.GDAL.DataType.GDT_CFloat64:
case OSGeo.GDAL.DataType.GDT_CInt16:
case OSGeo.GDAL.DataType.GDT_CInt32:
break;
case OSGeo.GDAL.DataType.GDT_Float32:
result = new GdalRaster <float>(dataset, band);
break;
case OSGeo.GDAL.DataType.GDT_Float64:
result = new GdalRaster <double>(dataset, band);
break;
case OSGeo.GDAL.DataType.GDT_Int16:
result = new GdalRaster <short>(dataset, band);
break;
case OSGeo.GDAL.DataType.GDT_UInt16:
case OSGeo.GDAL.DataType.GDT_Int32:
result = new GdalRaster <int>(dataset, band);
break;
case OSGeo.GDAL.DataType.GDT_TypeCount:
break;
case OSGeo.GDAL.DataType.GDT_UInt32:
result = new GdalRaster <long>(dataset, band);
break;
case OSGeo.GDAL.DataType.GDT_Unknown:
break;
default:
break;
}
}
if (result != null)
{
(result as DotSpatial.Data.Raster).Open();
}
return(result);
}
public override void Run()
{
OpenFileDialog openTiffDialog = new OpenFileDialog();
if (openTiffDialog.ShowDialog() == DialogResult.OK)
{
var tiffName = openTiffDialog.FileName;
OSGeo.GDAL.Dataset tiffDataset = OSGeo.GDAL.Gdal.Open(tiffName, OSGeo.GDAL.Access.GA_ReadOnly);
OSGeo.GDAL.Band band = tiffDataset.GetRasterBand(1);
DotSpatial.Data.IRaster raster = GIS.GDAL.RasterConverter.Gdal2DSRaster(tiffDataset, 1);
FileInfo fileInfo = new FileInfo(tiffName);
raster.Name = fileInfo.Name;
GIS.FrameWork.Application.App.Map.Layers.Add(raster);
}
}
private void regression(List <Cell> samplePoints)
{
// 构造输入输出数据集
// 样本数目
int COUNT = samplePoints.Count;
// 构造输入和输出数据集
double[][] inputs = new double[COUNT][];
bool[] outputs = new bool[COUNT];
for (int i = 0; i < COUNT; i++)
{
Cell cell = samplePoints[i];
int pos = cell.row * width + cell.col;
inputs[i] = (from buffer in driveBuffers
select buffer[pos]).ToArray <double>();
outputs[i] = cell.type;
}
var learner = new IterativeReweightedLeastSquares <Accord.Statistics.Models.Regression.LogisticRegression>()
{
Tolerance = 1e-8, // 收敛参数
Iterations = 20, // 最大循环数目
Regularization = 0,
ComputeStandardErrors = true
};
Accord.Statistics.Models.Regression.LogisticRegression regression = learner.Learn(inputs, outputs);
// 输出 odds
StringBuilder strb = new StringBuilder();
for (int i = 0; i <= inputs[0].Length; i++)
{
strb.AppendLine(" " + i + " : " + regression.GetOddsRatio(i));
}
updateConsoleEvent(strb.ToString());
// 输出 weights
StringBuilder strw = new StringBuilder();
strw.AppendLine("权重系数：");
strw.AppendLine("截距: " + regression.Intercept.ToString());
var weights = regression.Weights;
for (int i = 0; i < weights.Length; i++)
{
strw.AppendLine("权重" + (i + 1) + ":" + weights[i]);
}
updateConsoleEvent(strw.ToString());
double[] result = new double[width * height];
double minProp = double.MaxValue;
double[] minInput = null;
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
int pos = row * width + col;
if (beginBuffer[pos] < 0 || !IsValid(pos))
{
result[pos] = -9999;
continue;
}
double[] input = (from buffer in driveBuffers
select buffer[pos]).ToArray <double>();
double prop = regression.Probability(input);
if (prop < minProp)
{
minProp = prop;
minInput = input;
}
result[pos] = prop;
}
}
// 新建 GDAL dataset
OSGeo.GDAL.Driver driver = OSGeo.GDAL.Gdal.GetDriverByName("GTIFF");
OSGeo.GDAL.Dataset dataset = driver.Create(this.ResultLayerName, width, height, 1, OSGeo.GDAL.DataType.GDT_Float64, null);
dataset.WriteRaster(0, 0, width, height, result, width, height, 1, new int[1] {
1
}, 0, 0, 0);
dataset.FlushCache();
// 将GDAL dataset转化为IRaster数据集
DotSpatial.Data.IRaster raster = GIS.GDAL.RasterConverter.Gdal2DSRaster(dataset, 1);
raster.Name = "Result";
GIS.FrameWork.Application.App.Map.Layers.Add(raster);
}
/// <summary>
/// DotSpatial to Gdal at Raster Level
/// </summary>
/// <param name="raster">Dotspatial Raster</param>
/// <param name="options">Set Options When Gdal Create Dataset. Default is null.</param>
/// <param name="bandMap">Gdal WriteRaster Method Need to Set BandMap</param>
/// <returns>Gdal Dataset</returns>
public static OSGeo.GDAL.Dataset Ds2GdalRaster(DotSpatial.Data.IRaster raster, string[] options, int[] bandMap)
{
OSGeo.GDAL.Dataset result = null;
OSGeo.GDAL.Driver driver = OSGeo.GDAL.Gdal.GetDriverByName("MEM");
OSGeo.GDAL.DataType dataType;
string rasterDataType = raster.DataType.ToString().ToUpper();
switch (rasterDataType)
{
case "SYSTEM.INT32":
case "SYSTEM.LONG":
dataType = OSGeo.GDAL.DataType.GDT_Int32;
break;
case "SYSTEM.SHORT":
dataType = OSGeo.GDAL.DataType.GDT_Int16;
break;
case "SYSTEM.DOUBLE":
case "SYSTEM.SINGLE":
dataType = OSGeo.GDAL.DataType.GDT_Float64;
break;
case "SYSTEM.FLOAT":
dataType = OSGeo.GDAL.DataType.GDT_Float32;
break;
case "SYSTEM.BYTE":
dataType = OSGeo.GDAL.DataType.GDT_Byte;
break;
default:
dataType = OSGeo.GDAL.DataType.GDT_Int16;
break;
}
result = driver.Create("", raster.NumColumnsInFile, raster.NumRowsInFile, 1, dataType, options);
///地理坐标信息
result.SetGeoTransform(raster.Bounds.AffineCoefficients);
///投影设置 Set Projection
result.SetProjection(raster.Projection.ToProj4String());
///波段个数
int bandNum = raster.NumBands;
if (bandNum < 1)
{
bandNum = 1;
}
///赋值
switch (rasterDataType)
{
case "SYSTEM.INT32":
case "SYSTEM.LONG":
result.WriteRaster(0, 0, raster.NumColumns, raster.NumRows, DS2GdalValue <int>(raster), raster.NumColumns, raster.NumRows, bandNum, bandMap, 0, 0, 0);
break;
case "SYSTEM.SHORT":
result.WriteRaster(0, 0, raster.NumColumns, raster.NumRows, DS2GdalValue <short>(raster), raster.NumColumns, raster.NumRows, bandNum, bandMap, 0, 0, 0);
break;
case "SYSTEM.DOUBLE":
case "SYSTEM.SINGLE":
result.WriteRaster(0, 0, raster.NumColumns, raster.NumRows, DS2GdalValue <double>(raster), raster.NumColumns, raster.NumRows, bandNum, bandMap, 0, 0, 0);
break;
case "SYSTEM.FLOAT":
result.WriteRaster(0, 0, raster.NumColumns, raster.NumRows, DS2GdalValue <float>(raster), raster.NumColumns, raster.NumRows, bandNum, bandMap, 0, 0, 0);
break;
case "SYSTEM.BYTE":
result.WriteRaster(0, 0, raster.NumColumns, raster.NumRows, DS2GdalValue <byte>(raster), raster.NumColumns, raster.NumRows, bandNum, bandMap, 0, 0, 0);
break;
default:
result.WriteRaster(0, 0, raster.NumColumns, raster.NumRows, DS2GdalValue <int>(raster), raster.NumColumns, raster.NumRows, bandNum, bandMap, 0, 0, 0);
break;
}
return(result);
}
/// <summary>
/// DotSpatial to Gdal at Value Level
/// </summary>
/// <typeparam name="T">Type</typeparam>
/// <param name="raster">Dotspatial Raster</param>
/// <returns>Value of Raster</returns>
private static T[] DS2GdalValue <T>(DotSpatial.Data.IRaster raster)
{
T[] result = new T[raster.NumRows * raster.NumColumns];
Object[] objects = new Object[raster.NumRows * raster.NumColumns];
int i = 0;
string rasterDataType = raster.DataType.ToString().ToUpper();
switch (rasterDataType)
{
case "SYSTEM.INT32":
case "SYSTEM.LONG":
for (int row = 0; row < raster.NumRows; row++)
{
for (int column = 0; column < raster.NumColumns; column++)
{
result[i] = (T)((object)(int)raster.Value[row, column]);
i++;
}
}
break;
case "SYSTEM.SHORT":
for (int row = 0; row < raster.NumRows; row++)
{
for (int column = 0; column < raster.NumColumns; column++)
{
result[i] = (T)((object)(short)raster.Value[row, column]);
i++;
}
}
break;
case "SYSTEM.DOUBLE":
case "SYSTEM.SINGLE":
for (int row = 0; row < raster.NumRows; row++)
{
for (int column = 0; column < raster.NumColumns; column++)
{
result[i] = (T)((object)(double)raster.Value[row, column]);
i++;
}
}
break;
case "SYSTEM.FLOAT":
for (int row = 0; row < raster.NumRows; row++)
{
for (int column = 0; column < raster.NumColumns; column++)
{
result[i] = (T)((object)(float)raster.Value[row, column]);
i++;
}
}
break;
case "SYSTEM.BYTE":
for (int row = 0; row < raster.NumRows; row++)
{
for (int column = 0; column < raster.NumColumns; column++)
{
result[i] = (T)((object)(byte)raster.Value[row, column]);
i++;
}
}
break;
default:
for (int row = 0; row < raster.NumRows; row++)
{
for (int column = 0; column < raster.NumColumns; column++)
{
result[i] = (T)((object)(int)raster.Value[row, column]);
i++;
}
}
break;
}
return(result);
}
