GeoTIFF Plugin
--------------

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

**References**

* `GeoTiffReaderTest.java <https://github.com/geotools/geotools/blob/main/modules/plugin/geotiff/src/test/java/org/geotools/gce/geotiff/GeoTiffReaderTest.java>`_
* `GeoTiffWriterTest.java <https://github.com/geotools/geotools/blob/main/modules/plugin/geotiff/src/test/java/org/geotools/gce/geotiff/GeoTiffWriterTest.java>`_

**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.

.. image:: /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.