[Proj] Grown error if re-projecting from 4269 to LCC (2285) and backward multiple times

Thomas Knudsen knudsen.thomas at gmail.com
Sat Nov 4 10:04:17 EST 2017

Thanks, Clifford, for some very informative notes. I have taken the liberty
to add them (with proper attribution) as a comment to the
implementation in PJ_lcca.c, to let people know how (preferably not)
to use this projection.

(The pull request sits over at https://github.com/OSGeo/proj.4/pull/640 )


2017-11-03 15:54 GMT+01:00 Clifford J Mugnier <cjmce at lsu.edu>:

> The French Army Truncated Cubic Lambert (partially conformal) Conic
> projection is the Legal system for the projection in France between the
> late 1800s and 1948 when the French Legislature changed the law to
> recognize the fully conformal version.  It was (might still be in one or
> two North African prior French Colonies) used in North Africa in Algeria,
> Tunisia, & Morocco, as well as in Syria during the Levant.
> Last time I have seen it used was about 30+ years ago in Algeria when it
> was used to define Lease Block boundaries for Petroleum Exploration &
> Production.
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