55
REASONS TO
CONVERT PRODUCTS TO NAVD 88
Surveys
between bench marks will often close better
NAVD 88 has provided a better reference to
compute GPS-Derived Orthometric Heights
40,000 Additional bench marks of
First-Order accuracy is available on NAVD 88
Data and NAVD 88 adjusted height values is readily available
and accessible
in a convenient format from NGS’s web site:
http://www.ngs.noaa.gov
Federal Surveying and Mapping agencies will stop publishing on NGVD 29 and will publish only on NAVD
88
Surveys performed for the Federal Government requires the use
of NAVD 88
