[Proj] Difference between same projections types

Hermann Peifer peifer at gmx.eu
Wed Feb 15 13:13:13 EST 2012

On 15/02/2012 10:48, support.mn at elisanet.fi wrote:
> Hello,
> the two first definitions are self sustained...

Just to add that the first definition is sort of over-defined:
+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs

+datum=WGS84 resolves already to: +ellps=WGS84 +towgs84=0,0,0. So you 
double-define the ellipsoid (which however doesn't harm). cs2cs -v says:

#--- following specified but NOT used
# +ellps=WGS84

+no_defs also doesn't have any impact in the above case.


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