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When i calculate two positions along a longitude east of the origin (point E4N52 and point E4N52.1) the easting reduces when going northwards. According te the convention the convergence should be positive and not negative.
Testing with a UTM projection gives the expected results:
From the above results it seems that for utm the convergence is
negative when west and positive when east of lon_0.
If you calculate two utm positions along the same longitude east of
lon_0, you see that the easting reduces when going northwards.
From this is seems that TrueNorth = GridNorth + convergence which complies with the convention.
Last Modified by warmerdam on 22 Sep 2008 14:54 UTC
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."