Use this program to compute NAVD 88 surface gravity as a function of latitude and longitude.
Gravity is computed by the method used to compute gravity for the NAVD 88 adjustment.
This is also the method used to compute the Modelled Gravity which shows on
NGS data sheets.
Computations may be performed for a specific geographical location
or for a file of input points.
The NAVD 88 gravity may differ from the measured gravity at a point,
or from the gravity value produced by the
Surface Gravity tool
in this toolkit by a few milligals.
This is because:
The interpolation method used in computing NAVD 88 gravity
may introduce some smoothing of measured values.
NAVD 88 gravity is computed using a gravity model determined at
the time of the NAVD 88 adjustment.
New or revised values added to the NGS gravity data base since that time
may affect the Surface Gravity computations
but will have no effect on the NAVD 88 gravity.
The output is returned to your browser as text.
You may use the SaveAs function of your browser to save this file to your computer,
or you may use cut and paste functions to move the information to another application.
If your input contains errors or positions for which the NAVD 88 gravity cannot be computed,
then the error messages are printed and other output is suppressed.