topocentric coordinates

(top-ŏ-sen -trik) The coordinates of a celestial body measured from the surface of the Earth. For a star there is little or no detectable difference between topocentric coordinates and those referring to the Earth's center in a geocentric coordinate system. For a member of the Solar System the difference can be significant and a correction must be made.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Topocentric Coordinates

three quantities that specify the spatial position of an observed point or object, such as a satellite or an aircraft, in a coordinate system whose origin coincides with the point of observation on the earth’s surface. Topocentric coordinates are used for analyzing the results of observations in astronomy, astrometry, geodesy, and satellite geodesy. Depending on the choice of the coordinate reference plane, topocentric coordinates may be equatorial, horizontal, or orbital.

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References in periodicals archive

By assumption, the analysis of the time series should be referred to topocentric coordinates (horizontal components N, E and vertical component U).

IGS08.ATX TO IGS14.ATX CHANGE DEPENDENT DIFFERENCES IN A GNSS-DERIVED POSITION TIME SERIES

The quality is measured in terms of standard deviations of the topocentric coordinates ([delta]e, [delta]n, [delta]u).

The validation process is carried out by computing the standard deviations of the rover position error ([[sigma].sub.n], [[sigma].sub.e], [[sigma].sub.u]) of topocentric coordinates. A single number, [[sigma].sub.[rho]], is assigned and the corresponding state is obtained.

Reliability Analysis of Network Real-Time Kinematic

All of the Cartesian coordinates (X,Y,Z) provided by the systems and determined manually in ITRF2008 datum were then converted to the local topocentric coordinates (north, east and up) and differences for all components were calculated as reads by Equation 4.

Accuracy Investigation of PPP Method Versus Relative Positioning Using Different Satellite Ephemerides Products Near/Under Forest Environment

You can calculate an ephemeris for any interval in astrometric, geocentric, rectangular, or topocentric coordinates and then display it on screen, save it as a file on disk, or print it.

Ceres

From practical reasons the spatial Cartesian coordinates X, Y, Z are transformed into geodetic coordinates B, L, h, and eventually into local topocentric coordinates n, e, u.

On GPS heighting in local networks

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