Establishment of Geodetic Coordinate Systems - Geodesy: Introduction to Geodetic Datum and Geodetic Systems - page 369

Fig. 7.10 Relationships between three local coordinate systems in China

O 1980 X 1980 Y 1980 Z 1980 are parallel to each other. The direction of their Z-axis is

parallel to the direction from the Earth's center of mass to the polar origin JYD 1968.0
and the X-axis is situated in the plane of the initial geodetic meridian.
It can be seen from Fig. 7.10 that the new BJS54 is a local coordinate system
obtained from translating XAS80 in space and replacing the GRS75 Ellipsoid
parameters with the Krassowski Ellipsoid parameters. Its translations have the
same values as the positioning parameters Z 0 (with positive or

negative signs) solved according to ( 7.35 ) in XAS80, but of opposite sign.
Hence, the formulae for transformations between the two Cartesian coordinate
systems are:

Δ X 0 , Δ Y 0 , and Δ

9
=

X new1954 ﾼ X 1980 Δ X o

Y new1954 ﾼ Y 1980 Δ Y o , ð 7 : 36 Þ

;

Z new1954 ﾼ Z 1980 Δ Z o

and the formulae for transformations between the two local coordinate systems are:

9
=

L new1954 ﾼ L 1980 dL

B new1954 ﾼ B 1980 dB , ð 7 : 37 Þ

;

H new1954 ﾼ H 1980 dH

where