Andrea Aime a écrit :
> Is there any way to provide a validity area for a projection in WKT?
No. At least not in the WKT specification that appears in OGC 01-009 document.
Maybe the WKT format has been extended in an other OGC specification, I don't
know...
> If not, should we think about an extension to WKT
> in order to handle that one too?
This is doable and is probably the easiest solution. We would need to decide
whatever WKT formatting should include this solution or not, since it is
non-standard.
However maybe we will want to add the transformation accuracy later, and other
datum shift methods than "TOWGS84" later, etc. Instead than forking the WKT
standard more, an alternative may be to write the new CRS in an EPSG database
(or a new database with the same schema but different data). In such case, the
task is either:
* Write new code for writting an arbitrary CRS into an EPSG-like database.
It may be a two weeks work.
* Or create Forms in OpenOffice.org Base software for making easy to add
manually new CRS in an EPSG-like database. EPSG already provides forms
in Access format, but Access is not freely available. In addition, forms
in OpenOffice.org Base has one additional advantage: they work no matter
what the database engine is (HSQL, PostgreSQL, etc.), at the difference
of EPSG forms which are tied to Access.
The later is a non-Java work that could be given to a student (not sure if it
is
an interresting task for a student however), and maybe we could offer the
OpenOffice forms to EPSG after that.
Martin
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