P.Rizzi Ag.Mobilità Ambiente a écrit :
In fact I looked into the GeoTools code and find no easy way of getting the
SRID from a CoordinateReferenceSystem. Sadly this is something that happens
often with GeoTools...
I wrote a utility class to get the SRID from a CoordinateReferenceSystem,
but I'm not sure if the way I did it is the best one, neither I know if
there're better ways.
An utility class will probably be helpfull (we will have to decide where
to put it). But one issue to solve first is: what SRID is exactly? It is
just an integer, and unfortunatly the integer meaning depends on the
authority. EPSG has its own set of numerical codes; an other authority
will have a different set of numerical codes. Unfortunatly there is no
way (as far as I know) to determine which authority a 'getSRID()' method
use.
A possible approach is to decide that the integer returned by
'getSRID()' is always a code from the EPSG authority factory. But we
would have to make this assumption very clear in our documentation. In
such case, the utilities program would have to be a little bit more
elaborated in order to search specifically for the EPSG authority (to
make things worst, EPSG CRS have both a textual and a numerical
identifier). A volunter for writting this utility, since I'm now used to
write this kind of code. We just have to decide if the above-cited
assumption is acceptable, and where to put the utility (probably in
org.geotools.referencing.crs.CRS?).
Martin.
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