GPS is used increasingly and commonly in the last past year in all aspect of live. But the height
information in GPS is not the actual height. To convert it to actual height is needed geoid un-
dulation. Geoid has three wavelengths i.e. short, medium and long. From these three geoids,
the long wavelength which is obtained from the global model is the important one to deter-
minant the geoid. Pavlis et al.  from NGA had established the global model (EGM2008)
which has orde and degree of 2190. This global model was validated and is used to calcula-
te the geoid undulation in Sulawesi. EGM2008 Validation was carried out with comparation
between the geoid undulation of EGM2008 and EGM1996 [Lemoine et al., 1998] with the ge-
oid undulation from GPS-Leveling’s observation data. The result of this validation shows that
EGM2008 in Sulawesi has better results compare with EGM1996. The standard deviation of
EGM2008 is 0.88 cm better than EGM1996.
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