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/******************************************************************************
* $Id: GDALRead.cs 13437 2007-12-21 21:02:38Z tamas $
*
* Name: GDALRead.cs
* Project: GDAL CSharp Interface
* Purpose: A sample app to read GDAL raster data.
* Author: Tamas Szekeres, szekerest@gmail.com
*
******************************************************************************
* Copyright (c) 2007, Tamas Szekeres
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
using System;
using System.Drawing;
using System.Drawing.Imaging;
using OSGeo.GDAL;
/**
* <p>Title: GDAL C# GDALRead example.</p>
* <p>Description: A sample app to read GDAL raster data.</p>
* @author Tamas Szekeres (szekerest@gmail.com)
* @version 1.0
*/
/// <summary>
/// A C# based sample to read GDAL raster data.
/// </summary>
class GDALRead {
public static void usage()
{
Console.WriteLine("usage: gdalread {GDAL dataset name} {output file name} {overview}");
System.Environment.Exit(-1);
}
public static void Main(string[] args)
{
int iOverview = -1;
if (args.Length < 2) usage();
if (args.Length == 3) iOverview = int.Parse(args[2]);
// Using early initialization of System.Console
Console.WriteLine("");
try
{
/* -------------------------------------------------------------------- */
/* Register driver(s). */
/* -------------------------------------------------------------------- */
Gdal.AllRegister();
/* -------------------------------------------------------------------- */
/* Open dataset. */
/* -------------------------------------------------------------------- */
Dataset ds = Gdal.Open( args[0], Access.GA_ReadOnly );
if (ds == null)
{
Console.WriteLine("Can't open " + args[0]);
System.Environment.Exit(-1);
}
Console.WriteLine("Raster dataset parameters:");
Console.WriteLine(" Projection: " + ds.GetProjectionRef());
Console.WriteLine(" RasterCount: " + ds.RasterCount);
Console.WriteLine(" RasterSize (" + ds.RasterXSize + "," + ds.RasterYSize + ")");
/* -------------------------------------------------------------------- */
/* Get driver */
/* -------------------------------------------------------------------- */
Driver drv = ds.GetDriver();
if (drv == null)
{
Console.WriteLine("Can't get driver.");
System.Environment.Exit(-1);
}
Console.WriteLine("Using driver " + drv.LongName);
/* -------------------------------------------------------------------- */
/* Get raster band */
/* -------------------------------------------------------------------- */
for (int iBand = 1; iBand <= ds.RasterCount; iBand++)
{
Band band = ds.GetRasterBand(iBand);
Console.WriteLine("Band " + iBand + " :");
Console.WriteLine(" DataType: " + band.DataType);
Console.WriteLine(" Size (" + band.XSize + "," + band.YSize + ")");
Console.WriteLine(" PaletteInterp: " + band.GetRasterColorInterpretation().ToString());
for (int iOver = 0; iOver < band.GetOverviewCount(); iOver++)
{
Band over = band.GetOverview(iOver);
Console.WriteLine(" OverView " + iOver + " :");
Console.WriteLine(" DataType: " + over.DataType);
Console.WriteLine(" Size (" + over.XSize + "," + over.YSize + ")");
Console.WriteLine(" PaletteInterp: " + over.GetRasterColorInterpretation().ToString());
}
}
/* -------------------------------------------------------------------- */
/* Processing the raster */
/* -------------------------------------------------------------------- */
SaveBitmapBuffered(ds, args[1], iOverview);
}
catch (Exception e)
{
Console.WriteLine("Application error: " + e.Message);
}
}
private static void SaveBitmapBuffered(Dataset ds, string filename, int iOverview)
{
// Get the GDAL Band objects from the Dataset
Band redBand = ds.GetRasterBand(1);
if (redBand.GetRasterColorInterpretation() == ColorInterp.GCI_PaletteIndex)
{
SaveBitmapPaletteBuffered(ds, filename, iOverview);
return;
}
if (redBand.GetRasterColorInterpretation() == ColorInterp.GCI_GrayIndex)
{
SaveBitmapGrayBuffered(ds, filename, iOverview);
return;
}
if (redBand.GetRasterColorInterpretation() != ColorInterp.GCI_RedBand)
{
Console.WriteLine("Non RGB images are not supported by this sample! ColorInterp = " +
redBand.GetRasterColorInterpretation().ToString());
return;
}
if (ds.RasterCount < 3)
{
Console.WriteLine("The number of the raster bands is not enough to run this sample");
System.Environment.Exit(-1);
}
if (iOverview >= 0 && redBand.GetOverviewCount() > iOverview)
redBand = redBand.GetOverview(iOverview);
Band greenBand = ds.GetRasterBand(2);
if (greenBand.GetRasterColorInterpretation() != ColorInterp.GCI_GreenBand)
{
Console.WriteLine("Non RGB images are not supported by this sample! ColorInterp = " +
greenBand.GetRasterColorInterpretation().ToString());
return;
}
if (iOverview >= 0 && greenBand.GetOverviewCount() > iOverview)
greenBand = greenBand.GetOverview(iOverview);
Band blueBand = ds.GetRasterBand(3);
if (blueBand.GetRasterColorInterpretation() != ColorInterp.GCI_BlueBand)
{
Console.WriteLine("Non RGB images are not supported by this sample! ColorInterp = " +
blueBand.GetRasterColorInterpretation().ToString());
return;
}
if (iOverview >= 0 && blueBand.GetOverviewCount() > iOverview)
blueBand = blueBand.GetOverview(iOverview);
// Get the width and height of the raster
int width = redBand.XSize;
int height = redBand.YSize;
// Create a Bitmap to store the GDAL image in
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppRgb);
DateTime start = DateTime.Now;
byte[] r = new byte[width * height];
byte[] g = new byte[width * height];
byte[] b = new byte[width * height];
redBand.ReadRaster(0, 0, width, height, r, width, height, 0, 0);
greenBand.ReadRaster(0, 0, width, height, g, width, height, 0, 0);
blueBand.ReadRaster(0, 0, width, height, b, width, height, 0, 0);
TimeSpan renderTime = DateTime.Now - start;
Console.WriteLine("SaveBitmapBuffered fetch time: " + renderTime.TotalMilliseconds + " ms");
int i, j;
for (i = 0; i< width; i++)
{
for (j=0; j<height; j++)
{
Color newColor = Color.FromArgb(Convert.ToInt32(r[i+j*width]),Convert.ToInt32(g[i+j*width]), Convert.ToInt32(b[i+j*width]));
bitmap.SetPixel(i, j, newColor);
}
}
bitmap.Save(filename);
}
private static void SaveBitmapPaletteBuffered(Dataset ds, string filename, int iOverview)
{
// Get the GDAL Band objects from the Dataset
Band band = ds.GetRasterBand(1);
if (iOverview >= 0 && band.GetOverviewCount() > iOverview)
band = band.GetOverview(iOverview);
ColorTable ct = band.GetRasterColorTable();
if (ct == null)
{
Console.WriteLine(" Band has no color table!");
return;
}
if (ct.GetPaletteInterpretation() != PaletteInterp.GPI_RGB)
{
Console.WriteLine(" Only RGB palette interp is supported by this sample!");
return;
}
// Get the width and height of the Dataset
int width = band.XSize;
int height = band.YSize;
// Create a Bitmap to store the GDAL image in
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppRgb);
DateTime start = DateTime.Now;
byte[] r = new byte[width * height];
band.ReadRaster(0, 0, width, height, r, width, height, 0, 0);
TimeSpan renderTime = DateTime.Now - start;
Console.WriteLine("SaveBitmapBuffered fetch time: " + renderTime.TotalMilliseconds + " ms");
int i, j;
for (i = 0; i< width; i++)
{
for (j=0; j<height; j++)
{
ColorEntry entry = ct.GetColorEntry(r[i+j*width]);
Color newColor = Color.FromArgb(Convert.ToInt32(entry.c1),Convert.ToInt32(entry.c2), Convert.ToInt32(entry.c3));
bitmap.SetPixel(i, j, newColor);
}
}
bitmap.Save(filename);
}
private static void SaveBitmapGrayBuffered(Dataset ds, string filename, int iOverview)
{
// Get the GDAL Band objects from the Dataset
Band band = ds.GetRasterBand(1);
if (iOverview >= 0 && band.GetOverviewCount() > iOverview)
band = band.GetOverview(iOverview);
// Get the width and height of the Dataset
int width = band.XSize;
int height = band.YSize;
// Create a Bitmap to store the GDAL image in
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppRgb);
DateTime start = DateTime.Now;
byte[] r = new byte[width * height];
band.ReadRaster(0, 0, width, height, r, width, height, 0, 0);
TimeSpan renderTime = DateTime.Now - start;
Console.WriteLine("SaveBitmapBuffered fetch time: " + renderTime.TotalMilliseconds + " ms");
int i, j;
for (i = 0; i< width; i++)
{
for (j=0; j<height; j++)
{
Color newColor = Color.FromArgb(Convert.ToInt32(r[i+j*width]),Convert.ToInt32(r[i+j*width]), Convert.ToInt32(r[i+j*width]));
bitmap.SetPixel(i, j, newColor);
}
}
bitmap.Save(filename);
}
}
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