[Proj] Some typos in the libproj4 manual

Gerald I. Evenden geraldi.evenden at gmail.com
Wed Oct 1 16:55:51 EDT 2008

On Wednesday 01 October 2008 3:55:15 pm OvV_HN wrote:
> ----- Original Message -----
> From: "Gerald I. Evenden" <geraldi.evenden at gmail.com>
> I found some time ago several more errors (typos), omissions,
> inconsistencies between the formulae and the actual code, and other
> problems in the manual.
> They were rather numerous and there wasn't any progress visible beyond the
> "Preliminary Draft" version of March 2005.
> So I chose to wait until a "real" version of the libproj4 manual would
> appear.....

I will put the current version on my site by this weekend.  Some corrections 
may have escaped due to my occasional  sloth.  My apologies in advance.

> If the math will be perfected, then the manual will become a valuable
> reference for cartographic projections in general.
> Another suggestion: give a numerical example with at least 5 decimals plus
> the exact command line code for each and every function.

What do you mean by "every function."  In term of precision of functions that 
depends upon what the function is returning.

What would be nice is for certified sample computations for all known grid 
systems.  Now that would be a *great* contribution.

In terms of forward projection precision, many sources only publish to the 
centimeter and I think someone on the list claimed that 100nm was sufficient 
for some applications.  Anyway ... .

On occasion, I think some get a little carried away with precision.  ;-)
> Oscar van Vlijmen

The whole religious complexion of the modern world is due
to the absence from Jerusalem of a lunatic asylum.
-- Havelock Ellis (1859-1939) British psychologist

More information about the Proj mailing list