[Proj] Expanding a proj4 CRS definition

[Phil Elson]

> What else should it return? That is the proj string behind the EPSG code.

As you said, I'm interested in the expansion of the defaults, not just the
values directly from the lookup.

> I guess you are looking for default values which you don't want to add
explicitly.

Exactly. Thank you for pointing me at gdalsrsinfo - that is exactly what I
was looking for!

All the best,

Phil


On 4 March 2014 17:50, Andre Joost <andre+joost at nurfuerspam.de> wrote:

> Hi Phil,
>
> Am 04.03.2014 15:41, schrieb Phil Elson:
> > I'm curious to know whether it is possible for proj4 to return a complete
> > representation of a projection definition. For instance, supposing I
> gave a
> > proj4 string of:
> >
> > +proj=merc
> >
> > It would be useful to get back a projection definition such as:
> >
> > +proj=merc +lat_ts=0 ...
>
> gdalsrsinfo does exactly that.
>
> >
> > Similarly, though this is less important to me, is it possible to go
> from:
> >
> > +init=epsg:3309
> >
> > To
> >
> > +proj=aea +lat_1=34 +lat_2=40.5 ...
> >
> > Without just returning the string found in share/proj/epsg?
>
> What else should it return? That is the proj string behind the EPSG code.
>
> >
> > I guess what I'm really asking whether there is an internal
> representation
> > of these values which can then be used to pump out a string suitable for
> > passing through to proj4 later on?
> >
>
> I guess you are looking for default values which you don't want to add
> explicitly.
>
> You can play with gdalsrsinfo and look what it returns on incomplete input.
>
> Greetings,
> André Joost
>
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