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    Re: AP terminology
    From: Geoffrey Kolbe
    Date: 2009 Nov 14, 08:33 +0000

    Peter Hakel wrote [NavList 10645]:
    >Since LOPs are one-dimensional objects, you need precisely one
    >parameter to characterize them.  It is this parametrization that
    >amounts to "calculating the LOP directly" (answer to Geoffrey
    >Kolbe's question).  Sumner used longitude as the parameter.  The
    >parameter doesn't have to be longitude and in the case of
    >LOP=meridian, it is in fact unsuitable.
    Sorry Peter, this does not answer my question - how do you calculate
    the LOP "directly"? And I don't think I agree with you anyway about
    just needing one parameter to characterise an LOP. LOPs are two
    dimensional objects (they are lines) and - at least within the
    reference frame of standard spherical trig where the origin is the
    centre of the earth - need two parameters to characterise them. In
    standard St. Hilaire terminology, the two parameters are a bearing
    and an intercept distance from the estimated (assumed, dead
    reckoning) position.
    Echoing Frank in posting 10667, I would appreciate it if Karl came
    back and explained what he means by calculating the LOP "directly".
    Geoffrey Kolbe
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