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of the X and Y coordinates of the Rijksdriehoekmeting, used e.g. in
topographical maps, and a Z coordinate which is the height above Normaal
Amsterdams Peil, the mean sea level at Amsterdam. X, Y, and Z are all
expressed in meters (this is a change compared to the previous versions
of this module!)

These transformations should only be used for locations in or close to
the Netherlands.

See http://www.rdnap.nl/ for a description of the RD-NAP system;
especially http://www.rdnap.nl/download/rdnaptrans.pdf for the formulas
used in this module.

=head2 Precision

This module implements an approximated transformation, which should be
accurate to about 25 cm in X and Y, and about 1 meter in the vertical
direction, for all locations in the Netherlands. The full
transformation, called RDNAPTRANS, is NOT implemented in this module. It
takes into account small deviations, measured at more than 5000 points
in the Netherlands.