5.1.1  Spatial Location and Co-ordination

The BIM origin point and orientation of the model should be based on the actual location of the development by referring two widely used Hong Kong geodetic horizontal and vertical control networks, namely the Hong Kong 1980 Grid System (HK 1980 Grid) and Hong Kong Principal Datum (HKPD).

The HK 1980 Grid and HKPD should be presented in metres corrected to three decimal places (i.e. (8XX,XXX.XXX mN, 8XX,XXX.XXX mE) and (X.XXX mPD). Negative sign should be added for negative mPD (i.e. – X.XXX mPD).