Added by jgarnett, last edited by Adrian Custer on Sep 19, 2008  (view change) show comment

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The image module in the plugin group provides access to the 'world plus image' file formats.

This is the quickest way to get a GIF or JEPG onto a map display - simply add a small text file along side the image defining the image's extend and use this plugin.

Example Code

// example needed

Supported Formats

Depending on how you have JAI / Image IO set up the following should be supported:

  • jpeg
  • png
  • gif

World File

a small text file that says where the corners of the image is. The extension of a world file is the first and last letters of the image extension with w appended at the end. The coordinates are in the units of the projections, so -180,180 -90,90 for lat/long.
If your image is not in lat/long you will have to include a .prj file, which is a text file with the WKT definition of the coordinate system that should be used.
Example:

If your image is world.jpg then you need a world.jgw file and optionally a world.prj file.

0.0359281435
0.0000000000
0.0000000000
-0.0359281437
-179.9820349282
89.9820359281

Projection

A projection file (prj) is WKT representation of the projection the image is in:

image.prj
GEOGCS["GCS_WGS_1984", DATUM["WGS_1984", SPHEROID["WGS_1984",6378137,298.257223563]], PRIMEM["Greenwich",0], UNIT["Degree",0.017453292519943295]]

References