Hello, 

I am completely new to GIS and have a project that requires some GIS
functionality and I have spent the last week (in vain) trying to do it from
first principles, learn how I might use geotools2 from the geotools wiki and
the javadocs, and I have to say I am more confused than when I started,
though I have learnt of the existence of a lot of concepts, I don't quite
grasp how they might be used to help me solve the problem at hand.

My problem is as follows:

I have:
+ an map image in PNG format
+ the latitude and longitude of the CENTER of the above map
+ the projection of the above map (plate carree)
+ the datum used for the above map (NAD83)

I need:
+ the latitude and longitude of the top left and bottom right corners of the
map
+ the latitude and longitude of the point that is <width-of-map-image>
pixels to the right of the center of map
+ the latitude and longitude of the point that is <height-of-map-image>
pixels to the bottom of the center of the map

Unfortunately, after all the reading and searching, I am completely lost and
really do not even know where to start looking. 

A small snippet of Geotools2 code that does something like the above would
be incredibly useful in pointing me towards the right modules of the
geotools codebase where I can dig deeper. I know that has probably something
to do with the referencing module, but I have NO idea what the code needs to
look like to get started.

Any help at all would be GREATLY appreciated. Thanks so much in advance for
your patience with a newbie query.



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