/// <summary>
/// 和GetData功能相同，但是使用GDAL直接从文件中读取数据。
/// </summary>
/// <param name="fileName">文件名字</param>
/// <param name="width">ref用于返回数据的宽度</param>
/// <param name="height">ref用于返回数据的高度</param>
/// <returns>一维数据数组,按行优先</returns>
private double[] GdalGetData(string fileName, ref int width, ref int height)
{
OSGeo.GDAL.Dataset dataset = OSGeo.GDAL.Gdal.Open(fileName, OSGeo.GDAL.Access.GA_ReadOnly);
width = dataset.RasterXSize;
height = dataset.RasterYSize;
double[] imageBuffer = new double[width * height];
OSGeo.GDAL.Band b = dataset.GetRasterBand(1);
b.ReadRaster(0, 0, width, height, imageBuffer, width, height, 0, 0);
return(imageBuffer);
}
///// <summary>
///// 根据栅格图层名字返回栅格图层数据数组
///// </summary>
///// <param name="layerName">图层名字</param>
///// <param name="width">ref类型,数据的宽度</param>
///// <param name="height">ref类型,数据的高度</param>
///// <returns>数据数组，按行优先</returns>
//private double[] GetData(string layerName, ref int width, ref int height)
//{
// var map = GIS.FrameWork.Application.App.Map;
// var layers = map.Layers;
// ILayer selectedLayer = null;
// for (int i = 0; i < layers.Count; i++)
// {
// var layer = layers[i];
// if (layer.LegendText == layerName)
// {
// selectedLayer = layer;
// break;
// }
// }
// if (selectedLayer == null)
// {
// return null; // 图层名无效
// }
// try
// {
// RasterLayer rasterLayer = selectedLayer as RasterLayer;
// IRaster rasterDataSet = rasterLayer.DataSet;
// Dataset dataset = GIS.GDAL.RasterConverter.Ds2GdalRaster(rasterDataSet, null, new int[] { 1 });
// width = dataset.RasterXSize;
// height = dataset.RasterYSize;
// double[] imageBuffer = new double[width * height];
// Band band = dataset.GetRasterBand(1);
// band.ReadRaster(0, 0, width, height, imageBuffer, width, height, 0, 0);
// return imageBuffer;
// }
// catch
// {
// return null; // 图层不是栅格图层或将图层转化为GDAL dataset失败或从GDAL dataset中读取数据失败
// }
//}
/// <summary>
/// 和GetData功能相同，但是使用GDAL直接从文件中读取数据。
/// 获取空间参照信息
/// </summary>
/// <param name="fileName">文件名字</param>
/// <param name="width">ref用于返回数据的宽度</param>
/// <param name="height">ref用于返回数据的高度</param>
/// <returns>一维数据数组,按行优先</returns>
protected double[] GdalGetData(string fileName, ref int width, ref int height)
{
OSGeo.GDAL.Dataset dataset = OSGeo.GDAL.Gdal.Open(fileName, OSGeo.GDAL.Access.GA_ReadOnly);
width = dataset.RasterXSize;
height = dataset.RasterYSize;
this.geoTransform = new double[6];
dataset.GetGeoTransform(geoTransform);
this.projStr = dataset.GetProjection();
this.tiffType = dataset.GetType();
double[] imageBuffer = new double[width * height];
OSGeo.GDAL.Band b = dataset.GetRasterBand(1);
b.ReadRaster(0, 0, width, height, imageBuffer, width, height, 0, 0);
double noDataVal;
int hasVal;
b.GetNoDataValue(out noDataVal, out hasVal);
this.noDataVal = noDataVal;
return(imageBuffer);
}
private void ReadARGB()
{
if (_dataset.RasterCount < 4)
{
throw new GdalException("ARGB Format was indicated but there are only " + _dataset.RasterCount + " bands!");
}
_alpha = _red;
_red = _dataset.GetRasterBand(2);
_green = _dataset.GetRasterBand(3);
_blue = _dataset.GetRasterBand(4);
Width = _red.XSize;
Height = _red.YSize;
_image = new Bitmap(Width, Height, PixelFormat.Format32bppRgb);
byte[] a = new byte[Width * Height];
byte[] r = new byte[Width * Height];
byte[] g = new byte[Width * Height];
byte[] b = new byte[Width * Height];
_alpha.ReadRaster(0, 0, Width, Height, a, Width, Height, 0, 0);
_red.ReadRaster(0, 0, Width, Height, r, Width, Height, 0, 0);
_green.ReadRaster(0, 0, Width, Height, g, Width, Height, 0, 0);
_blue.ReadRaster(0, 0, Width, Height, b, Width, Height, 0, 0);
BitmapData bData = _image.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
Stride = bData.Stride;
_image.UnlockBits(bData);
Values = new byte[Width * Height * 4];
BytesPerPixel = 4;
for (int row = 0; row < Height; row++)
{
for (int col = 0; col < Width; col++)
{
Values[row * Stride + col * BytesPerPixel] = b[row * Width + col];
Values[row * Stride + col * BytesPerPixel + 1] = g[row * Width + col];
Values[row * Stride + col * BytesPerPixel + 2] = r[row * Width + col];
Values[row * Stride + col * BytesPerPixel + 3] = a[row * Width + col];
}
}
WriteBytes();
}
private void ReadRGB()
{
if (_dataset.RasterCount < 3)
{
throw new GdalException("RGB Format was indicated but there are only " + _dataset.RasterCount + " bands!");
}
_green = _dataset.GetRasterBand(2);
_blue = _dataset.GetRasterBand(3);
Width = _red.XSize;
Height = _red.YSize;
_image = new Bitmap(Width, Height, PixelFormat.Format32bppRgb);
byte[] r = new byte[Width * Height];
byte[] g = new byte[Width * Height];
byte[] b = new byte[Width * Height];
_red.ReadRaster(0, 0, Width, Height, r, Width, Height, 0, 0);
_green.ReadRaster(0, 0, Width, Height, g, Width, Height, 0, 0);
_blue.ReadRaster(0, 0, Width, Height, b, Width, Height, 0, 0);
BitmapData bData = _image.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
Stride = bData.Stride;
_image.UnlockBits(bData);
byte[] vals = new byte[Width * Height * 4];
BytesPerPixel = 4;
int stride = Stride;
int bpp = BytesPerPixel;
int width = Width;
int height = Height;
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
vals[row * stride + col * bpp] = b[row * width + col];
vals[row * stride + col * bpp + 1] = g[row * width + col];
vals[row * stride + col * bpp + 2] = r[row * width + col];
vals[row * stride + col * bpp + 3] = 255;
}
}
Values = vals;
WriteBytes();
}
private Bitmap ReadGrayIndex(int xOffset, int yOffset, int xSize, int ySize, Band first)
{
Band first_o;
int width = xSize;
int height = ySize;
if (first.GetOverviewCount() > 0 && _overview >= 0)
{
first_o = first.GetOverview(_overview);
}
else
{
first_o = first;
}
if (xOffset + width > first_o.XSize)
{
width = first_o.XSize - xOffset;
}
if (yOffset + height > first_o.YSize)
{
height = first_o.YSize - yOffset;
}
Bitmap result = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] r = new byte[width * height];
first.ReadRaster(xOffset, yOffset, width, height, r, width, height, 0, 0);
BitmapData bData =
result.LockBits(new Rectangle(0, 0, xSize, ySize),
ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
int stride = Math.Abs(bData.Stride);
byte[] vals = new byte[height * stride];
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
byte value = r[row * width + col];
vals[row * stride + col * 4] = value;
vals[row * stride + col * 4 + 1] = value;
vals[row * stride + col * 4 + 2] = value;
vals[row * stride + col * 4 + 3] = 255;
}
}
Marshal.Copy(vals, 0, bData.Scan0, vals.Length);
result.UnlockBits(bData);
return result;
}
/// <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);
}
private void ReadArgb()
{
if (_dataset.RasterCount < 4)
{
throw new GdalException("ARGB Format was indicated but there are only " + _dataset.RasterCount + " bands!");
}
_alpha = _red;
_red = _dataset.GetRasterBand(2);
_green = _dataset.GetRasterBand(3);
_blue = _dataset.GetRasterBand(4);
int tw = TileCollection.TileWidth;
int th = TileCollection.TileHeight;
for (int row = 0; row < TileCollection.NumTilesTall(); row++)
{
for (int col = 0; col < TileCollection.NumTilesWide(); col++)
{
int width = TileCollection.GetTileWidth(col);
int height = TileCollection.GetTileHeight(row);
InRamImageData id = new InRamImageData(width, height);
Bitmap image = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] red = new byte[width * height];
byte[] g = new byte[width * height];
byte[] b = new byte[width * height];
byte[] a = new byte[width * height];
_red.ReadRaster(col * tw, row * th, width, height, red, width, height, 0, 0);
_green.ReadRaster(col * tw, row * th, width, height, g, width, height, 0, 0);
_blue.ReadRaster(col * tw, row * th, width, height, b, width, height, 0, 0);
_alpha.ReadRaster(col * tw, row * th, width, height, a, width, height, 0, 0);
BitmapData bData = image.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
Stride = bData.Stride;
image.UnlockBits(bData);
byte[] vals = new byte[Width * Height * 4];
int stride = Stride;
const int bpp = 4;
for (int r = 0; r < height; r++)
{
for (int c = 0; c < width; c++)
{
vals[r * stride + c * bpp] = b[r * width + c];
vals[r * stride + c * bpp + 1] = g[r * width + c];
vals[r * stride + c * bpp + 2] = red[r * width + c];
vals[r * stride + c * bpp + 3] = a[r * width + c];
}
}
id.Values = vals;
id.CopyValuesToBitmap();
TileCollection.Tiles[row, col] = id;
}
}
SetTileBounds(Bounds.AffineCoefficients);
}
private void ReadRGB()
{
if (_dataset.RasterCount < 3)
{
throw new GdalException("RGB Format was indicated but there are only " + _dataset.RasterCount + " bands!");
}
_green = _dataset.GetRasterBand(2);
_blue = _dataset.GetRasterBand(3);
int tw = TileCollection.TileWidth;
int th = TileCollection.TileHeight;
int ntt = TileCollection.NumTilesTall();
int ntw = TileCollection.NumTilesWide();
ProgressMeter pm = new ProgressMeter(_prog, "Reading Tiles ", ntt*ntw);
for (int row = 0; row < ntt; row++)
{
for (int col = 0; col < ntw; col++)
{
int width = TileCollection.GetTileWidth(col);
int height = TileCollection.GetTileHeight(row);
MWImageData id = new MWImageData(width, height);
Bitmap image = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] red = new byte[width*height];
byte[] g = new byte[width*height];
byte[] b = new byte[width*height];
_red.ReadRaster(col * tw, row * th, width, height, red, width, height, 0, 0);
_green.ReadRaster(col * tw, row * th, width, height, g, width, height, 0, 0);
_blue.ReadRaster(col * tw, row * th, width, height, b, width, height, 0, 0);
BitmapData bData = image.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
Stride = bData.Stride;
image.UnlockBits(bData);
byte[] vals = new byte[width*height*4];
int stride = Stride;
const int bpp = 4;
for (int r = 0; r < height; r++)
{
for (int c = 0; c < width; c++)
{
vals[r*stride + c*bpp] = b[r*width + c];
vals[r*stride + c*bpp + 1] = g[r*width + c];
vals[r*stride + c*bpp + 2] = red[r*width + c];
vals[r*stride + c*bpp + 3] = 255;
}
}
id.Values = vals;
id.WriteBytes();
TileCollection.Tiles[row, col] = id;
pm.CurrentValue = row*ntw + col;
}
}
pm.Reset();
SetTileBounds(Bounds.AffineCoefficients);
}