Hi Khalid,
> I have meteorological data to display with a ma pat the baground.
> And I have a map as gif image file.
> How can I do this ?
One problem will be that a map in a GIF file will be hard to
geo-reference (i.e., align GIF pixels with latitude and
longitude). For a good general start at learning VisAD, see
Ugo's excellent tutorial at:
http://www.geogr.uni-jena.de/~p6taug/visad/tutorial/index.html
There are also numerous examples in the visad/examples
directory, including SatDisplay.java that overlays a map
(not from a GIF file) on a satellite image.
Good luck, Bill