A. Select the points, burying the mold:-Location of buried GPS landmark IV class is selected according to the design schematics included 12 points denoted GPS1, GPS2,..., GPS12. The mold is buried in where the geology is stable, solid, outside the area are building and conducive to the development of the grid.* When the select the class IV GPS landmark agreement to bury the pieces the following technical requirements:-Make sure the angle of view around the point being obscured is 1500 (the market from the point of measuring stations, looking up the sky) to ensure the number of satellites are evenly distributed in the sky around the set point air, minimizing the error caused by the satellite map, ensuring treatment PDOP < 4.-Not affected by the electromagnetic waves (radio remote broadcast ≥ 500 m) satellite signal Jammer affect the calculation results.-GPS Points must be selected in the place, away from tall buildings, the lagoon ... in order to avoid the phenomenon of reflection does not move to the center of the receiver antennas which were reflections from the unsophisticated, this wave at line is the line segments that caused the error of the measurement edge. -The quality of the mold and the mold size GPS standard IV class, numbered face mold regulated and write the number of the mold.
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