87
NGS’
RESPONSIBILITIES
Estimated
conversion (bias) shifts between NGVD 29 and NAVD 88
Analyzed bias shift computations to
determine where other data, e.g., COE and/or USGS data, may be required (in computer-readable form)
to improve the estimate of the bias factor
Analyzed the vertical control network to determine “local” areas where height changes are due to
crustal movement