public static Dataset AutoCreateWarpedVRT(Dataset src_ds, string src_wkt, string dst_wkt, ResampleAlg eResampleAlg, double maxerror)
{
IntPtr cPtr = GdalPINVOKE.AutoCreateWarpedVRT(Dataset.getCPtr(src_ds), src_wkt, dst_wkt, (int)eResampleAlg, maxerror);
Dataset ret = (cPtr == IntPtr.Zero) ? null : new Dataset(cPtr, true, ThisOwn_true());
if (GdalPINVOKE.SWIGPendingException.Pending) throw GdalPINVOKE.SWIGPendingException.Retrieve();
return ret;
}
/// <summary>
/// Initilizes default fields.
/// </summary>
/// <param name="inputFile">FullName of input GeoTIFF.</param>
/// <param name="outputDirectory">FullName of output directory.</param>
/// <param name="minZ">Minimum zoom.</param>
/// <param name="maxZ">Maxmimum zoom.</param>
/// <param name="resampling">Resampling method.</param>
private static void Initialize(string inputFile,
string outputDirectory,
int minZ,
int maxZ,
ResampleAlg resampling)
{
InputFile = inputFile;
OutputDirectory = outputDirectory;
MinZ = minZ;
MaxZ = maxZ;
Resampling = resampling;
QuerySize = 4 * TileSize;
// Open the input file
Dataset inputDataset = Gdal.Open(InputFile, Access.GA_ReadOnly);
DataBandsCount = inputDataset.RasterCount;
// Read the georeference
double[] outGeoTransform = new double[6];
inputDataset.GetGeoTransform(outGeoTransform);
OutGeoTransform = outGeoTransform;
// Set x/y sizes of dataset
RasterXSize = inputDataset.RasterXSize;
RasterYSize = inputDataset.RasterYSize;
// Dispose InputDataset
inputDataset.Dispose();
// Generate dictionary with min max tile coordinates for all zoomlevels
foreach (int zoom in Enumerable.Range(MinZ, MaxZ - MinZ + 1))
{
double xMin = OutGeoTransform[0];
double yMin = OutGeoTransform[3] - RasterYSize * OutGeoTransform[1];
double xMax = OutGeoTransform[0] + RasterXSize * OutGeoTransform[1];
double yMax = OutGeoTransform[3];
int[] lonLatToTile = GetTileNumbersFromCoords(xMin, yMin, xMax, yMax, TileSize, zoom);
int tileMinX = lonLatToTile[0];
int tileMinY = lonLatToTile[1];
int tileMaxX = lonLatToTile[2];
int tileMaxY = lonLatToTile[3];
// crop tiles extending world limits (+-180,+-90)
tileMinX = Math.Max(0, tileMinX);
tileMinY = Math.Max(0, tileMinY);
tileMaxX = Math.Min(Convert.ToInt32(Math.Pow(2, zoom + 1)) - 1, tileMaxX);
tileMaxY = Math.Min(Convert.ToInt32(Math.Pow(2, zoom)) - 1, tileMaxY);
MinMax.Add(zoom, new[] { tileMinX, tileMinY, tileMaxX, tileMaxY });
}
}
/// <summary>
/// Crops input GeoTIFF to tiles.
/// Important: You should call your <see cref="GdalConfiguration.ConfigureGdal"/> method from Gdal.NET package BEFORE using this method.
/// </summary>
/// <param name="inputFile">FullName of input GeoTIFF.</param>
/// <param name="outputDirectory">FullName of output directory.</param>
/// <param name="minZ">Minimum zoom.</param>
/// <param name="maxZ">Maxmimum zoom.</param>
/// <param name="resampling">Resampling method.</param>
public static void CropTifToTiles(string inputFile,
string outputDirectory,
int minZ,
int maxZ,
ResampleAlg resampling)
{
Initialize(inputFile, outputDirectory, minZ, maxZ, resampling);
GenerateBaseTiles();
CreateBaseTile();
CreateOverviewTiles();
MinMax.Clear();
foreach (Dictionary <string, int> d in Metadata)
{
d.Clear();
}
Metadata.Clear();
}
/// <summary>
/// Scales down query dataset to the tile dataset.
/// </summary>
/// <param name="queryDataset">Source dataset.</param>
/// <param name="tileDataset">Destination dataset.</param>
/// <param name="resampling">Resampling method.</param>
private static void ScaleQueryToTile(Dataset queryDataset, Dataset tileDataset, ResampleAlg resampling)
{
queryDataset.SetGeoTransform(new[]
{
0.0,
Convert.ToSingle(tileDataset.RasterXSize) / queryDataset.RasterXSize,
0.0, 0.0, 0.0,
Convert.ToSingle(tileDataset.RasterXSize) / queryDataset.RasterXSize
});
tileDataset.SetGeoTransform(new[] { 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 });
Gdal.ReprojectImage(queryDataset, tileDataset, null, null, resampling, 0.0, 0.0, null, null, null);
}
private void 栅格数据重投影ToolStripMenuItem_Click(object sender, EventArgs e)
{
//选择投影变换图层
SelectLayer selFrm = new SelectLayer(mapControl);
selFrm.Text = "选择变换图层";
selFrm.label2.Text = "选择栅格图层";
selFrm.label1.Visible = false;
selFrm.comboBox1.Visible = false;
selFrm.label3.Visible = true;
selFrm.comboBox3.Visible = true;
selFrm.comboBox3.Items.Add("NearestNeighbour");
selFrm.comboBox3.Items.Add("Bilinear");
selFrm.comboBox3.Items.Add("Cubic");
selFrm.comboBox3.Items.Add("CubicSpline");
if (selFrm.ShowDialog(this) == DialogResult.OK)
{
int index = 0;
for (int i = 0; i < mapControl._MapLayers.Count(); i++)
{
if (mapControl._MapLayers[i].Name == selFrm.cb2)
{
index = i;
break;
}
}
//选择输出文件路径
SaveFileDialog sfd = new SaveFileDialog();
sfd.Title = "选择重投影文件存储路径";
sfd.Filter = @"Tiff(*.tif)|*.tif";
if (sfd.ShowDialog() == DialogResult.OK)
{
string path = sfd.FileName; //文件路径
string[] path2 = path.Split(new char[1] {
'\\'
}); //文件名
string name = path2[path2.Count() - 1];
//投影转换
TransformProject transform = new TransformProject();
float[] MBR = new float[4];
mapControl._MapLayers[index].GetExtent(MBR);
double[] dbx = { (double)MBR[0], (double)MBR[0], (double)MBR[2], (double)MBR[2] };
double[] dby = { (double)MBR[1], (double)MBR[3], (double)MBR[1], (double)MBR[3] };
Dataset ds = Gdal.Open(mapControl._MapLayers[index].FilePath, Access.GA_ReadOnly);
//重采样方式
ResampleAlg re = ResampleAlg.GRA_NearestNeighbour;
if (selFrm.cb3 == "Bilinear")
{
re = ResampleAlg.GRA_Bilinear;
}
else if (selFrm.cb3 == "Cubic")
{
re = ResampleAlg.GRA_Cubic;
}
else if (selFrm.cb3 == "CubicSpline")
{
re = ResampleAlg.GRA_CubicSpline;
}
transform.TransformTiff(ds, dbx, dby, path, re);
//转换结果添加至地图
mapControl.AddTiffLayer(path, name);
if (tVLayers.Nodes.Count == 0)
{
tVLayers.Nodes.Add("图层");
}
tVLayers.Nodes[0].Nodes.Insert(0, name);
tVLayers.ExpandAll();
tVLayers.SelectedNode = tVLayers.Nodes[0].Nodes[0];
MessageBox.Show("成功转换至Web墨卡托投影！", "投影转换结果");
}
}
}
public static Dataset AutoCreateWarpedVRT(Dataset src_ds, string src_wkt, string dst_wkt, ResampleAlg eResampleAlg, double maxerror)
{
IntPtr cPtr = GdalPINVOKE.AutoCreateWarpedVRT(Dataset.getCPtr(src_ds), src_wkt, dst_wkt, (int)eResampleAlg, maxerror);
Dataset ret = (cPtr == IntPtr.Zero) ? null : new Dataset(cPtr, true, ThisOwn_true());
if (GdalPINVOKE.SWIGPendingException.Pending)
{
throw GdalPINVOKE.SWIGPendingException.Retrieve();
}
return(ret);
}
public static CPLErr ReprojectImage(Dataset src_ds, Dataset dst_ds, string src_wkt, string dst_wkt, ResampleAlg eResampleAlg, double WarpMemoryLimit, double maxerror, Gdal.GDALProgressFuncDelegate callback, string callback_data)
{
CPLErr ret = (CPLErr)GdalPINVOKE.ReprojectImage(Dataset.getCPtr(src_ds), Dataset.getCPtr(dst_ds), src_wkt, dst_wkt, (int)eResampleAlg, WarpMemoryLimit, maxerror, callback, callback_data);
if (GdalPINVOKE.SWIGPendingException.Pending)
{
throw GdalPINVOKE.SWIGPendingException.Retrieve();
}
return(ret);
}
public static CPLErr ReprojectImage(Dataset src_ds, Dataset dst_ds, string src_wkt, string dst_wkt, ResampleAlg eResampleAlg, double WarpMemoryLimit, double maxerror, Gdal.GDALProgressFuncDelegate callback, string callback_data)
{
CPLErr ret = (CPLErr)GdalPINVOKE.ReprojectImage(Dataset.getCPtr(src_ds), Dataset.getCPtr(dst_ds), src_wkt, dst_wkt, (int)eResampleAlg, WarpMemoryLimit, maxerror, callback, callback_data);
if (GdalPINVOKE.SWIGPendingException.Pending) throw GdalPINVOKE.SWIGPendingException.Retrieve();
return ret;
}
// 将给定Tif转换为Web Mercator投影
public void TransformTiff(Dataset ds, double[] VerticeX, double[] VerticeY, string FilePath, ResampleAlg eResampleMethod)
{
//获取Web墨卡托坐标系
SpatialReference Mercator = new SpatialReference("");
Mercator.ImportFromEPSG(3857); // Web Mercator
Mercator.SetMercator(0d, 0d, 1d, 0d, 0d);
string MercatorWkt;
Mercator.ExportToWkt(out MercatorWkt);
//原栅格坐标信息
SpatialReference Raster_spf = new SpatialReference(ds.GetProjectionRef());
//影像四个顶点投影转换
CoordinateTransformation coordinateTrans = Osr.CreateCoordinateTransformation(Raster_spf, Mercator);
coordinateTrans.TransformPoints(4, VerticeX, VerticeY, null); //VerticeX和VerticeY存储的是影像四个顶点坐标
coordinateTrans.Dispose();
//计算重投影后栅格顶点坐标
double dbMinx = 0;
double dbMaxx = 0;
double dbMiny = 0;
double dbMaxy = 0;
dbMinx = Math.Min(Math.Min(Math.Min(VerticeX[0], VerticeX[1]), VerticeX[2]), VerticeX[3]);
dbMaxx = Math.Max(Math.Max(Math.Max(VerticeX[0], VerticeX[1]), VerticeX[2]), VerticeX[3]);
dbMiny = Math.Min(Math.Min(Math.Min(VerticeY[0], VerticeY[1]), VerticeY[2]), VerticeY[3]);
dbMaxy = Math.Max(Math.Max(Math.Max(VerticeY[0], VerticeY[1]), VerticeY[2]), VerticeY[3]);
//计算新的仿射变换参数
double[] newTransform = new double[6];
newTransform[0] = dbMinx; //左上角点x坐标
newTransform[3] = dbMaxy; //左上角点y坐标
newTransform[1] = 100; //像素宽度
newTransform[5] = -100; //像素高度
//计算大小
int width = (int)Math.Ceiling(Math.Abs(dbMaxx - dbMinx) / 100.0);
int height = (int)Math.Ceiling(Math.Abs(dbMaxy - dbMiny) / 100.0);
//创建新的栅格影像
OSGeo.GDAL.Driver pGDalDriver = Gdal.GetDriverByName("GTiff");
Dataset poDataset = pGDalDriver.Create(FilePath, width, height, 1, DataType.GDT_Float32, null);
poDataset.SetGeoTransform(newTransform);
poDataset.SetProjection(MercatorWkt);
//重投影
Gdal.ReprojectImage(ds, poDataset, ds.GetProjectionRef(), MercatorWkt, eResampleMethod, 0, 0, new Gdal.GDALProgressFuncDelegate(ProgressFunc), null, null);
//设置NoData值
Band band = poDataset.GetRasterBand(1);
band.SetNoDataValue(-10000000);
poDataset.FlushCache();
poDataset.Dispose();
}
