my 2cents

1) @Edgar: I have not heard about problems with your plugin. The only 
lack is its userfriendlyness. But projections are thought for expert 
users, and not for day to day gis users.

2) I had a go with the newer geotools code (Edgar uses older libs) about 
a year a go but stuck with some problems (the example provided at the 
webpage did not run, since they changed some thing.. i think we talked 
about that issue). Since that time i had no time to try again.

3) the internal JUMP projection stuff is nice but very limited. the 
problem - if we go further with that and not use geotools - is that we 
would need to reinvent the weel.

4) how to do: for simplicity i would recommend to have a layer-menu item 
   that allows you to reproject the data - for a first version (using 
the EPSG codes). In and out coordsystems have to be provided! 
Transformed data could be put to a new layer?
Hence, no "on-the-fly" projection. Further i think that transformed data 
are saved only if the user explicitly wants to save (lets call it export).
i did not yet thought about database stuff - this would need to set a 
projection for the current view, to receive the correct data (actually 
there is the SRID plugin/property for every layer to support the work 
with the postgis plugin that does something similar).

5) from my point of view we do *not need* to hurry with implementing it 
because a) Edgars plugin works for the wector data (as far as i know)
b) projections are something for experts. Something what i learned here 
at this uni is that people want to project something to somewhere, but 
have no clue what this means. (actually most people rather wonder why 
things do not fit - and after a while they realize that it has something 
to do with coordinate systems)

but a offer from Jody to help is of course nice offer

stefan

PS: as sunburned realized.. he has a lot of projects.. so i would also 
rather recommend to reschedule the projection project at an unknown date

Edgar Soldin schrieb:
> Hello all,
> 
> are there known bugs or problems, which prevent cts extension from 
> running in openjump? Are there requirements?
> Not sure but maybe I could spend a weekend these days...
> 
> regards ede
> --
>> Jody has offered to help if there is interest in prefecting/fixing the
>> code that Edgar wrote for Coordinate Projection using the GeoTools
>> library.
>>
>> I'd take this on myself but I have already made a lot of other commitments.
>>
>> If we have any takers I will let Jody know. This sounds like a great
>> opportunity to get projection support into OpenJUMP.
>>
>> SS
>>
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