CATCTR
- triangulation point: a recoverable point on the
earth, whose geographic coordinates have been determined by angular methods with geodetic
instruments. A triangulation point is a selected point, which has been marked with a
station mark, or it is a conspicuous natural or artificial object. Also called
trigonometric station or triangulation station. (IHO Dictionary, S-32, 5th Edition, 5646)
- observation spot: a point used by surveyors for
determining precise position by astronomical means. (IHO Chart Specifications, S-4)
- fixed point: a point whose position has been
accurately determined and plotted. (IHO Chart Specifications, S-4)
- bench-mark: a permanent, stable object
containing a marked point of known elevation with respect to a datum used as a reference
level for tidal observations or as a control point for levelling. (IHO Dictionary, S-32,
5th Edition, 462)
- boundary mark: a marker identifying the
location of a surveyed boundary line (Digital Geographic Information Standard - DIGEST,
Oct.87)
- horizontal control, main station: a station in
a network of permanently marked control points having their geographic positions
established to form third order accuracy or better. (Canadian Hydrographic Service, Survey
Standing Order, 3.1-85)
- horizontal control, secondary station: a
station in a network of control points of a localized nature utilized for shoreline plots,
sounding marks, stadia work, etc., whose geographic position may be established to a
slightly lower order than main control points. (Canadian Hydrographic Service, Survey
Standing Order, 3.1-85)