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Re: [udig-users] Overriding existing CRS
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1. Is it possible to override internal definition of existing CRS (e.g I
want to modify TOWGS parameter). I have found file "epsg.properties" in
directory <UDIG>/plugins/net.refractions.udig.libs_<version>. I guess
its purpose is to add new CRS into uDig, but I'm not sure about uDig
behaviour if I use same code (and eventually name) as already defined CRS.
Yes but not well. You can use additional epsg.properties files a indicated. I think You can also place one of these in your application configuration folder (for definitions specific to your organisation).
2. Could you please exaplain how internal db of CRS definitions is
built, I mean if there is some automatic process to build internal db
from official epsg registry. How often is internal database of CRS updated?
It is the official epsg database; converted from access to HSQL or H2 format. There is a script in the geotools project that does the conversion.
The data model for the database remains unchanged; the script only "corrects" a few database specific things.
3. Does uDig support ESRI specific map projection parameters 'X_SCALE',
'Y_SCALE', 'XY_PLANE_ROTATION' used in some projections e.g. Krovak.
The WKT parsing engine translates ESRI and Oracle definitions as required.
References:
- http://docs.geotools.org/latest/userguide/library/referencing/index.html
- http://docs.geotools.org/latest/userguide/library/referencing/faq.html
- http://docs.geotools.org/latest/userguide/library/referencing/internal.html
Jody
