6.11　Survey of Tower Location Coordinates

6.11.1　When the spatial rectangular coordinates or geodetic coordinates of tower locations are requested by the Owner，a special survey shall be made.

6.11.2　China Geodetic Coordinate System 2000，Xi an Geodetic Coordinate System 1980，or Beijing Geodetic Coordinate System 1954 should be used as the horizontal coordinate system，while WGS84 coordinate system or local coordinate systems are also allowed if requested by the Owner.National or local elevation systems may be used as the elevation system.The coordinate systems used shall be indicated in the list of coordinate results of tower locations.

6.11.3　The survey of coordinates of tower locations shall be conducted simultaneously with location survey，for which the polar coordinate method by means of RTK GPS or total station may be used.

6.11.4　When RTK GPS is used for surveying the coordinates of tower locations，the precision shall be selected such that the linear offset is not more than 5cm and the relative error of distances in the line direction is not more than 1/1000.