[GIS] How to export only one band from an image using GDAL

gdalmulti-band

I have a multi-band GeoTiff, and I want to extract only the first band and write a new image consisting of only that band.

How do I do this using GDAL?

Best Answer

The Gdal_translate utility can be used.

The documentation mentions:

...to convert raster data between different formats, potentially performing some operations like subsettings, resampling, and rescaling pixels in the process.

It also has an option for bands, where you selects which bands you want to operate on.

So if you want to export just the first band, you can use the following command:

gdal_translate -b 1 input.tif output.tif

Related Solutions

[GIS] Reading data from raster band with Java and GDAL

There are a few ways to read the data. Forgive me, but I am not familiar with the java bindings and syntax. One method is to use GDALRasterBand->ReadBlock():

http://gdal.org/classGDALRasterBand.html#a09e1d83971ddff0b43deffd54ef25eef

That reads in the internal block defined by the driver, which is one scanline for the aaigrid driver. See the example in the documentation. To do this manually, similar to your example, use GDALRasterBand->RasterIO(), which appears to be wrapped in java with ReadRaster(). Loop over the raster GDALDataset->GetRasterYSize() times and read in one line:

double[]data = new double[nXSize];
for(int i = 0; i < nYSize; i++)
{
    band.ReadRaster(0, i, nXsize, 1, data);
    //do something with your data
}

You can change the size of your input window for whatever you would like to get from your data. For example, as above, use a 3x3 window on the ReadRaster() call to calculate slope and aspect. I just found a link to the javadoc here:

http://gdal.org/java/

[GIS] Adding DEM Band to existing 3-band TIFF file using QGIS

Use

gdalbuildvrt fiveband.vrt -separate dem.tif threebandalpha.tif
gdal_translate fiveband.vrt fiveband.tif

If you application uses GDAL, you can just open the vrt.

Best Answer

Related Solutions

[GIS] Reading data from raster band with Java and GDAL

[GIS] Adding DEM Band to existing 3-band TIFF file using QGIS

Related Question