[Proj] Difference between same projections types

[Hermann Peifer]

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.

Hermann