[GIS] How to Read&Write .tiff images in java using GDAL library

digital image processinggdalimagejava

I searched many sites to learn about this but I didn't find anything.

I need step by step process for reading .tiff monochromatic image in java using Gdal library.

Best Answer

I guess you have gdal and the bindings installed, and some coding ability, so I'll just provide an outline:

import org.gdal.gdal.gdal;
import org.gdal.gdal.Band;
import org.gdal.gdal.Dataset;

...
Dataset dataset = gdal.Open(filename);
Band band = dataset.GetRasterBand(1);
...
// Do some band operation, like band.ReadRaster() to get the data, whatever you need for your scenario.

There are more examples in the GDAL sources, like a Java equivalent of gdalinfo which will show you how to get the valuable metadata.

Also, make sure you read the Javadoc for whatever class you are using, and compare usage in the examples.

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] use to read MapInfo files in Java

I think you could use the experimental OGR plugin to do this in GeoTools.

Try adding

<dependency>
  <groupId>org.geotools</groupId>
  <artifactId>gt-ogr</artifactId>
  <version>${geotools.version}</version>
</dependency>

to your pom.xml - I've not tried but I expect it will pull down all the stuff you need.

Best Answer

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

[GIS] use to read MapInfo files in Java

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