[Proj] The world of ECEF aka geocentric coordinates

[Karney, Charles]

While we're at it, what's the consensus for the terminology for the
Cartesian system with origin at z = 0 tangent to ellipsoid, z up, y
north?  Choices so far:

    local Cartesian
    ENU
    topocentric

It seems that topocentric is the best, and this doesn't tie you down to
Cartesian coordinates.  Transforming to polar gives azimuth-elevation-
distance.

--
Charles Karney <ckarney at sarnoff.com>
Sarnoff Corporation, Princeton, NJ 08543-5300

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