terrestrial reference造句

• According to the resolution, this system was named European Terrestrial Reference System 89 ( ETRS89 ).
• The latter are determined based on the International Terrestrial Reference System, which follows the polar motion.
• Those are the International Terrestrial Reference Frames defined by the strangely-named International Earth Rotation Service.
• The accuracy is a bit lower than with GPS, but it still contributes to the International Terrestrial Reference Frame ( ITRF ).
• Yet the International Earth Rotation and Reference Systems Service and the International Astronomical Union have defined a framework called the International Terrestrial Reference System.
• It defined the IERS Reference Meridian, the International Terrestrial Reference System ( ITRS ), and subsequent International Terrestrial Reference Frames ( ITRF ).
• It defined the IERS Reference Meridian, the International Terrestrial Reference System ( ITRS ), and subsequent International Terrestrial Reference Frames ( ITRF ).
• One of the most common current usages of celestial navigation aboard large merchant vessels is for compass calibration and error checking at sea when no terrestrial references are available.
• Examples include the North American Datum 1983 ( NAD83 ), the European Terrestrial Reference Frame 1989 ( ETRF89 ), and the Geocentric Datum of Australia 1994 ( GDA94 ).
• Modern geodetic reference systems, such as the World Geodetic System and the International Terrestrial Reference Frame, use a single oblate spheroid, fixed to the Earth's gravitational centre.
• Since 31 December 2013, version PZ-90.11 is being broadcast, which is aligned to the International Terrestrial Reference System at epoch 2011.0 at the centimeter level.
• Technically, they provide the rotation transforming the International Terrestrial Reference System ( ITRS ) to the International Celestial Reference System ( ICRS ), or vice versa, as a function of time.
• Europe uses the European Terrestrial Reference System, North America uses NAD 83, while Australia implemented GDA94 ( http : / / www . geoproject . com . au / gda . faq . html ).
• Current geodetic realizations of the geocentric reference system family International Terrestrial Reference System ( ITRS ) maintained by the IERS are geocentric, and internally consistent, at the few-cm level, while still being metre-level consistent with WGS 84.
• This was officially accepted by the Bureau International de l'Heure ( BIH ) in 1984 via its BTS84 ( BIH Terrestrial System ) that later became WGS84 ( World Geodetic System 1984 ) and the various ITRFs ( International Terrestrial Reference Systems ).
• An " International Terrestrial Reference Frame " ( " ITRF " ) is a realization of the ITRS . New ITRF solutions are produced every few years, using the latest mathematical and surveying techniques to attempt to realize the ITRS as precisely as possible.
• The development of ETRS89 is related to the global EUREF, following its Resolution 1, which recommends that the terrestrial reference system to be adopted by EUREF will be coincident with ITRS at the epoch 1989.0 and fixed to the stable part of the Eurasian Plate.
• Thus the circle was aligned with the local vertical or plumb line, which is deflected slightly from the normal, or line perpendicular, to the reference ellipsoid used to define geodetic latitude and longitude in the International Terrestrial Reference Frame ( which is nearly the same as the WGS-84 system used by GPS ).