Tainan City Government has established its e-GPS system in September 2007. The e-GPS system contains 6 reference stations, and covers the whole city. Five reference stations, SCES, NJES, RFES, WHES, BKBL, evenly distributed in Tainan city’s borders, forming a nearly regular…

The test results show that the proposed method can mitigate the systematic errors of orthometric

height from e-GPS leveling efficiently. We present here the first part of the paper