[Proj] Lambert Conformal Conic

[Gerald I. Evenden]

On Sunday 26 April 2009 7:41:44 am OvV_HN wrote:
> There are more disturbing differences with respect to the Lambert
> projection.
>	....
> The Belgian example at hand reads:
>
> Lambert 1972 projection
> lat = 50d 40m 46.461s N; lon = 5d 48m 26.533s E;
> Published grid coordinates: X = 251763.204; Y = 153034.174 m
> With the published projection constants

Question: where do these constants come from and/or what do they mean?

I am not aware of making conic specifications in this manner.

> p = 0.7716421928
> k = 11565915.812935
> I get:
> 251763.20419; 153034.17402
> But with the exactly calculated projection constants I get:
> 251763.20416; 153034.13255
> Note the large difference in Y.
	...
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