[Proj] Some need for updated proj-4 manuals

[Hamish]

Janne wrote:
> Actually the minimium would be to have a list of available projections,

$ proj -l

> maybe some picture how it looks

http://www.galleryofmapprojections.com/  ->
http://www.csiss.org/map-projections/    (server down?)

> and an accurate description of all parameters

I wouldn't guarantee that it's a full set, but these are the ones used
in the EPSG file.

$ cat epsg | grep -v '^#' | tr ' ' '\n' | grep '^\+' | \
  cut -f1 -d'=' | sort | uniq
+a
+alpha
+b
+datum
+ellps
+k
+k_0
+lat_0
+lat_1
+lat_2
+lat_ts
+lon_0
+lonc
+no_defs
+pm
+proj
+south
+to_meter
+towgs84
+units
+x_0
+y_0
+zone

> and how they affect the result.

A short sentence/paragraph on each of the above would be nice.
As Markus suggested, the (FW/OSGeo) proj4 wiki is a nice place to work
on collaborative documents.
   http://trac.osgeo.org/proj/wiki/GenParms/

I made a start at naming the above, if others could please complete...


There you will find nice things like:
== Documentation ==
* General Parameter Notes
* Projections List page on the GeoTIFF site includes information on how
  to describe many common projections with PROJ.4 command arguments.


> The idea behind using libraries is that such work that can
> be done only once... also would be done only once.

Right.


Hamish