Spectra-precision Survey Pro v3.80 Recon GPS User Manual Manuel d'utilisateur télécharger pdf (Page 13)

GPS Coordinates

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ECEF XYZ

Geodetic coordinates are some times given in the Earth Centered

Earth Fixed (ECEF) Cartesian coordinate system. This coordinate

system has its origin at the Earth’s center of mass, the primary (Z)

axis is the earth’s spin axis; the secondary (X) axis is the intersection

of the equatorial plane and the mean meridian of Greenwich; the

tertiary (Y) axis is orthogonal in a right handed system. An ECEF

XYZ coordinate can be converted into the corresponding lat, lng, ht

using standard formulas.

For many surveying applications, the horizontal and vertical

coordinate systems are separate. Below are descriptions of common

horizontal and vertical coordinate systems used in surveying and

mapping.

Fig. 2: Earth Centered Earth

Fixed Geodetic Coordinates

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 94 95

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Spectra-precision Survey Pro v3.80 Recon GPS User Manual Manuel d'utilisateur Page 13