public static GeoBitmap LoadImageInfo(string file)
{
using (var ds = Gdal.Open(file, GdalconstJNI.GA_ReadOnly_get()))
{
log.InfoFormat("Raster dataset parameters:");
log.InfoFormat(" Projection: " + ds.ProjectionRef);
log.InfoFormat(" RasterCount: " + ds.RasterCount);
log.InfoFormat(" RasterSize (" + ds.RasterXSize + "," + ds.RasterYSize + ")");
Org.Gdal.Gdal.Driver drv = ds.Driver;
log.InfoFormat("Using driver " + drv.LongName);
log.InfoFormat("Corner Coordinates:");
log.InfoFormat(" Upper Left (" + GDALInfoGetPosition(ds, 0.0, 0.0) + ")");
log.InfoFormat(" Lower Left (" + GDALInfoGetPosition(ds, 0.0, ds.RasterYSize) + ")");
log.InfoFormat(" Upper Right (" + GDALInfoGetPosition(ds, ds.RasterXSize, 0.0) + ")");
log.InfoFormat(" Lower Right (" + GDALInfoGetPosition(ds, ds.RasterXSize, ds.RasterYSize) + ")");
log.InfoFormat(" Center (" + GDALInfoGetPosition(ds, ds.RasterXSize / 2, ds.RasterYSize / 2) + ")");
log.InfoFormat("");
string projection = ds.ProjectionRef;
if (projection != null)
{
SpatialReference srs = new SpatialReference(null);
if (srs.ImportFromWkt(projection) == 0)
{
string[] wkt = new string[1];
srs.ExportToPrettyWkt(wkt, 0);
log.InfoFormat("Coordinate System is:");
log.InfoFormat(wkt[0]);
}
else
{
log.InfoFormat("Coordinate System is:");
log.InfoFormat(projection);
}
}
var TL = GDALInfoGetPositionDouble(ds, 0.0, 0.0);
var BR = GDALInfoGetPositionDouble(ds, ds.RasterXSize, ds.RasterYSize);
var resolution = Math.Abs(BR[0] - TL[0]) / ds.RasterXSize;
if (resolution == 1)
{
throw new Exception("Invalid coords");
}
return(new GeoBitmap(file, resolution, ds.RasterXSize, ds.RasterYSize, TL[0], TL[1], BR[0], BR[1]));
}
}
public static Bitmap LoadImage(string file)
{
lock (locker)
{
using (var ds = Gdal.Open(file, GdalconstJNI.GA_ReadOnly_get()))
{
// 8bit geotiff - single band
if (ds.RasterCount == 1)
{
Band band = ds.GetRasterBand(1);
if (band == null)
{
return(null);
}
ColorTable ct = band.GetRasterColorTable();
// Create a Bitmap to store the GDAL image in
Bitmap bitmap = new Bitmap(ds.RasterXSize, ds.RasterYSize, SkiaSharp.SKColorType.Gray8);
// Obtaining the bitmap buffer
BitmapData bitmapData = bitmap.LockBits(0, 0, ds.RasterXSize, ds.RasterYSize,
ImageLockMode.ReadWrite, SkiaSharp.SKColorType.Rgba8888);
try
{
if (ct != null)
{
int iCol = ct.GetCount();
//ColorPalette pal = bitmap.Palette;
for (int i = 0; i < iCol; i++)
{
ColorEntry ce = ct.GetColorEntry(i);
//pal.Entries[i] = Color.FromArgb(ce.c4, ce.c1, ce.c2, ce.c3);
}
//bitmap.Palette = pal;
}
else
{
}
int stride = bitmapData.Stride;
IntPtr buf = bitmapData.Scan0;
var buffer = new byte[ds.RasterXSize * ds.RasterYSize];
band.ReadRaster(0, 0, ds.RasterXSize, ds.RasterYSize, ds.RasterXSize, ds.RasterYSize,
(int)DataType.GDT_Byte, buffer);
Marshal.Copy(buffer, 0, buf, buffer.Length);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
return(bitmap);
}
{
Bitmap bitmap = new Bitmap(ds.RasterXSize, ds.RasterYSize, PixelFormat.Format32bppArgb);
if (ds.RasterCount == 3)
{
// when we load a 24bit bitmap, we need to set the alpha channel else we get nothing
using (var tmp = Graphics.FromImage(bitmap))
{
tmp.Clear(Color.White);
}
}
for (int a = 1; a <= ds.RasterCount; a++)
{
// Get the GDAL Band objects from the Dataset
Band band = ds.GetRasterBand(a);
if (band == null)
{
return(null);
}
var cint = (ColorInterp)band.GetColorInterpretation();
// Obtaining the bitmap buffer
BitmapData bitmapData = bitmap.LockBits(0, 0, ds.RasterXSize, ds.RasterYSize,
ImageLockMode.ReadWrite, SkiaSharp.SKColorType.Rgba8888);
try
{
int stride = bitmapData.Stride;
IntPtr buf = bitmapData.Scan0;
var buffer = new byte[ds.RasterXSize * ds.RasterYSize];
band.ReadRaster(0, 0, ds.RasterXSize, ds.RasterYSize, ds.RasterXSize,
ds.RasterYSize, (int)DataType.GDT_Byte, buffer);
int c = 0;
if (cint == ColorInterp.GCI_AlphaBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 3 + c * 4, (byte)b);
c++;
}
}
else if (cint == ColorInterp.GCI_RedBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 2 + c * 4, (byte)b);
c++;
}
}
else if (cint == ColorInterp.GCI_GreenBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 1 + c * 4, (byte)b);
c++;
}
}
else if (cint == ColorInterp.GCI_BlueBand)
{
foreach (var b in buffer)
{
Marshal.WriteByte(buf, 0 + c * 4, (byte)b);
c++;
}
}
else
{
}
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
//bitmap.Save("gdal.png", ImageFormat.Png);
return(bitmap);
}
}
}
return(null);
}
