GIS_gdal geotiff文件与C# 数组array之间的转换

绝地灬酷狼 2022-12-31 08:25 111阅读 0赞

功能说明：

*  给一个tiff文件目录geotiff文件（tiff文件），转成c\#二维数组
 *  给一个c\#二维数组，转tiff文件

实现：

public void CreateRasterFromModuleFilePath(string pDirectory, string pFileName,
                string pRasterFormat, string pFilePath_Module, System.Array pArray, object pNoDataValue)
            {
                if (pDirectory == null || pDirectory == "" ||
                    pFileName == null || pFileName == "" ||
                    pRasterFormat == null || pRasterFormat == "")
                    return;
    
                // create a temporary directory
                string pDirectoryRandom = System.IO.Path.GetTempPath();
                pDirectoryRandom = System.IO.Path.GetDirectoryName(pDirectoryRandom);
    
                //if equal, create a new temp directory  
                if (pDirectoryRandom == pDirectory)
                {
                    string pRandom = System.Guid.NewGuid().ToString().Substring(0, 5);
                    pDirectoryRandom = pDirectory + pRandom;
                    System.IO.Directory.CreateDirectory(pDirectoryRandom);
                }
    
                Gdal.AllRegister();
                Dataset ds = Gdal.Open(pFilePath_Module, Access.GA_ReadOnly);
    
                // columns(xSize) and rows(ySize) of rasters
                int xSize     = ds.RasterXSize;
                int ySize     = ds.RasterYSize;
                //important for making sure the cellsize   
                int bandCount = ds.RasterCount;
                   
                // columns and rows of the pArray
                int countRow = pArray.GetLength(0);     //1342
                int countColumn = pArray.GetLength(1);  //1694
    
                // Make sure the new Geotiff file named pFileName has the same cellsize.
                bool diagnosis = ((xSize == countColumn) && (ySize == countRow));
                Debug.Assert(diagnosis, "The size should be the same between input Array and geotiff module!");
    
                double[] transform = new double[6] { 0, 0, 0, 0, 0, 0 };
                ds.GetGeoTransform(transform);//
    
                // get the information of Spatial Reference
                string projection = ds.GetProjection();//
    
                DataType dataType = ds.GetRasterBand(1).DataType;
                string rasterFormat = null;
    
                if (pRasterFormat == "TIFF") rasterFormat = "GTiff";
                else Debug.Assert(true, "unsupported data type now for RasterFormat!");
    
                OSGeo.GDAL.Driver driver = Gdal.GetDriverByName(rasterFormat);
                string geotiffOutputPath = pDirectoryRandom + "\\" + pFileName;
    
                //delete the old version of file
                if (System.IO.File.Exists(geotiffOutputPath))
                {
                    System.IO.File.Delete(geotiffOutputPath);
                }
    
    
                Dataset result = driver.Create(geotiffOutputPath, countColumn, countRow, bandCount, dataType, null);
    
                //set attributes
                result.SetGeoTransform(transform);
                result.SetProjection(projection);
    
                OSGeo.GDAL.CPLErr check = 0;
    
                if (pArray.GetValue(0, 0).GetType() == typeof(int))
                {
                    int[] tmpData = new int[countColumn * countRow];
                    int tmp = 0;
                    for (int i = 0; i < countRow; ++i)
                    {
                        for (int j = 0; j < countColumn; ++j)
                        {
                            tmp = (int)pArray.GetValue(i, j);
                            tmpData[i * countColumn + j] = tmp;
                        }
                    }
                    //writer geotiff data to file
                    try
                    {
                        //result.GetRasterBand(1).SetNoDataValue((int)pNoDataValue);    // Langping's implementation in file ALSAToolsAE.cs but with some warnings when transferring                                                                                                       
                        result.GetRasterBand(1).SetNoDataValue( ALSAGlobal.pNoDataInt); // john's improvement
                    }
                    catch (System.Exception ex)
                    {
                        Console.WriteLine("{0}: result.GetRasterBand(1).SetNoDataValue((int)pNoDataValue)  failed !", ex.ToString());
                    }
                    
                    // The value of xoff and yoff indicates the location that the upper left corner of the pixel block is to write.
                    check = result.GetRasterBand(1).WriteRaster(0, 0, countColumn, countRow, tmpData, countColumn, countRow, 0, 0);
                }
                else if (pArray.GetValue(0, 0).GetType() == typeof(float))
                {
                    float[] tmpData = new float[countColumn * countRow];
                    float tmp = 0;
                    for (int i = 0; i < countRow; ++i)
                    {
                        for (int j = 0; j < countColumn; ++j)
                        {
                            tmp = (float)pArray.GetValue(i, j);
                            tmpData[i * countColumn + j] = tmp;
                        }
                    }
                    //writer geotiff data to file
                    try
                    {
                        // result.GetRasterBand(1).SetNoDataValue((float)pNoDataValue); // Lang ping's implementation in file ALSAToolsAE.cs but with some warnings when transferring
                        result.GetRasterBand(1).SetNoDataValue(ALSAGlobal.pNoDataFloat);// john's improvement
                    }
                    catch (System.Exception ex)
                    {
                        Console.WriteLine("{0}: result.GetRasterBand(1).SetNoDataValue((int)pNoDataValue)  failed !", ex.ToString());
                    }                                                                                          
                    // The value of xoff and yoff indicates the location that the upper left corner of the pixel block is to write.
                    check = result.GetRasterBand(1).WriteRaster(0, 0, countColumn, countRow, tmpData, countColumn, countRow, 0, 0);
                }
                else
                {
                    Debug.Assert(true, "unsupported data type now for pArray!");
                }
    
                result.GetRasterBand(1).FlushCache();
                result.FlushCache();
    
                if (check == OSGeo.GDAL.CPLErr.CE_Failure || check == OSGeo.GDAL.CPLErr.CE_Fatal)
                    Debug.Assert(false, "write tmp geotiff failed!");
    
            }
            public System.Array GetRasterValuesFromFilePath(string pFilePath, bool pBoolBool)
            {
                if (pFilePath == null)
                {
                    //if null
                    return null;
                }
                if (!System.IO.File.Exists(pFilePath))
                {
                    return null;
                }
    
                Gdal.AllRegister();
                Dataset ds = Gdal.Open(pFilePath, Access.GA_ReadOnly);
                Band band = ds.GetRasterBand(1);
                int width = ds.RasterXSize;
                int height = ds.RasterYSize;
    
                if (band.DataType == DataType.GDT_Float32)
                {
                    System.Array resultArray = Array.CreateInstance(typeof(float), height, width);
                    float[] buffer = new float[width * height];
    
                    band.ReadRaster(0, 0, width, height, buffer, width, height, 0, 0);
                    for (int i = 0; i < buffer.Length; i++)
                        resultArray.SetValue(buffer[i], i / width, i % width);
                    return resultArray;
                }
    
                if (band.DataType == DataType.GDT_Byte) 
                {
                    if (pBoolBool)
                    {
                        // transform geotiff file to bool array
                        System.Array resultArray = Array.CreateInstance(typeof(bool), height, width);
                        byte[] buffer = new byte[width * height];
    
                        band.ReadRaster(0, 0, width, height, buffer, width, height, 0, 0);
                        for (int i = 0; i < buffer.Length; i++)
                            resultArray.SetValue((buffer[i] == 0 ? false : true), i / width, i % width);
                        return resultArray;
                    }
                    else
                    {
                        System.Array resultArray = Array.CreateInstance(typeof(byte), height, width);
    
                        byte[] buffer = new byte[width * height];
    
                        band.ReadRaster(0, 0, width, height, buffer, width, height, 0, 0);
                        for (int i = 0; i < buffer.Length; i++)
                            resultArray.SetValue(buffer[i], i / width, i % width);
                        return resultArray;
                    }
                }
    
                ds.Dispose();
                Debug.Assert(true, "unsupported data type now!");
                return null;
            }