GEOID96 vs GEOID99

• 2’x2’

• North: 54

• DEM: TOPO30

• 2951 GPS/BMs

• -31 cm NAVD 88 bias

• 5.5 cm RMS wrt GPS/BMs

• 1’x1’

• North: 58

• DEM: TOPO30 + NGSDEM99

• 6169 GPS/BMs

• -52 cm NAVD 88 bias

• 4.6 cm RMS wrt GPS/BMs

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