GeoTools

OSGeo

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GeoTIFF Plugin

The gt-geotiff module in the plugin group provides access to the GeoTiff file format.

References

Maven:

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

Example

You can use GeoTiff files directly using GridFormatFinder:

File file = new File("test.tiff");

AbstractGridFormat format = GridFormatFinder.findFormat( file );
GridCoverage2DReader reader = format.getReader( file );

You can also use GeoTiffReader directly:

File file = new File("test.tiff");

GeoTiffReader reader = new GeoTiffReader(file, new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));

You can use the reader to access a GridCoverage2D as normal:

GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
CoordinateReferenceSystem crs = coverage.getCoordinateReferenceSystem2D();
Envelope env = coverage.getEnvelope();
RenderedImage image = coverage.getRenderedImage();

GeoTIFF Coordinate System Construction

What makes GeoTIFF useful is the ability to store extend, and coordinate reference system information in the metadata fields of a normal TIFF file.

../../_images/geotiff_cs_construction.png

The above “flowchart” describes the order in which the GeoTIFF plugin examines the GeoTIFF tags and Keys in order to construct a coordinate system to accompany the raster data.