[Proj] Question about change in epsg file from named datum to defined form...
cgodkin at gmail.com
Tue Dec 21 00:31:28 EST 2010
I notice that Trac revision 1874 updated the "epsg" definitions file to use
+towgs84= instead of +datum=
as expressed briefly in this comment:
"epsg update from GDAL - add TMSO and change of named datums to defined form
I was wondering where I could read about the rationale for the latter
change. Ticket #18
seems to be about the addition of TMSO only as far as I can see.
This seems to make a difference for the NAD27 coordinate systems as far as I
how PROJ.4 works.
As I understand it, the +datum=NAD27 form (for example) uses datum shift
the replacement +towgs84=-10,158,187,0,0,0,0 form represents an average
Can someone either explain why this change was made or point me at a
perhaps in another list?
Thank you very much,
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