Reference Termium :
Domaine(s)
  – Mathematical
Geography
  – Remote Sensing
Domaine(s)
  – Géographie
mathématique
  – Télédétection
 
geodetic datum
Source CORRECT

geodetic
reference system
Source

système de
référence
géodésique
Source CORRECT, MASC

DEF – A
mathematical model
designed to best fit
part or all of the
geoid. Source

OBS – It is defined by
an ellipsoid and the
relationship between
the ellipsoid and a
point on the
topographic surface
established as the
origin of datum. This
relationship can be
defined by six
quantities, generally
(but not necessarily):
the geodetic latitude,
longitude, and the
height of the origin,
the two components
of the deflection of the
vertical at the origin,
and the geodetic
azimuth of a line from
the origin to some
other point. The GPS
uses WGS84. Source

OBS – Term and
definition provided by
the Canadian
Hydrographic Service.
Source

DEF – Système de
référence permettant
d'exprimer de façon
univoque la position
de tout point de la
surface terrestre.
Source