incorrect convergence calculation for lcc projection.

[osgeo]

incorrect convergence calculation for lcc projection.

[proj4-bot]

Comment by warmerdam on 22 Sep 2008 14:54 UTC
This is related to the thread:

http://lists.maptools.org/pipermail/proj/2008-September/003804.html

with the (current) conclusion:

http://lists.maptools.org/pipermail/proj/2008-September/003821.html

I'll wait for Gerald to complete his analysis and then look to apply the same fix he does.

[dtutic]

My findings also confirm that LCC gives opposite sign for meridian convergence if we accept the definition: "meridian convergence on a map, at a given point, is the angle measured clockwise from
the tangent to the projection of the meridian to the northing coordinate line (grid north)—also
called map angle or mapping angle."

Solution is to replace the line:

fac->conv = - Q->n * lp.lam;

with

fac->conv = Q->n * lp.lam;

in PJ_lcc.c