On Mar 1, 2006, at 10:12 AM, Andrea Aime wrote:
Can someone clarify how should I proceed, given that I cannot use
the MSAccess
epsg file? Did anyone try to re-generate the epsg.properties file
from the official EPSG database?
Or, does someone have some more info on how the postgis
spatial_ref_sys table
have been populated?
I think re-generating from the EPSG database is the best route, for
sure. You will have some issues in that the TOWGS84 entries can be
multiple for some DATUM->WGS84 transforms (different transforms are
most accurate for different locations). In addition to that, there
are some entries in epsg.properties that do not exist in the EPSG
database, they are unofficial numbers inserted by national bodies for
their own SDI purposes. But a diff between a newly generated and the
old file would turn those up quickly.
PostGIS spatial_ref_sys was generated by Frank using the WKT tools in
OGR, and has been handballed here and there since then. The current
epsg.properties was also handballed to add in TOWGS84 parameters
wherever I could find datum transformations on the web.
Paul
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