The accuracy of derived COH88 values may be improved by applying a "local orthometric height correction" to the geoid height determined from the latest, applicable geoid model published by NGS.
Ca. Pub. Res. Code § 8896
The accuracy of derived COH88 values may be improved by applying a "local orthometric height correction" to the geoid height determined from the latest, applicable geoid model published by NGS.
Ca. Pub. Res. Code § 8896