Retrieving "Vertical Datum" from the archives

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1. Areocentric Datum Standard 1998

   Linked via "vertical datum"

   Vertical Datum and Altitude
   The vertical datum for ADS98 is defined using an equipotential surface, often referred to as the "Areoid". Unlike Earth, where the geoid approximates sea level, the Martian Areoid is defined by the surface where the total potential ($\Phi$) equals a specific, calculated value derived from the maximum atmospheric pressure observed at the latitude of Valles Marineris during the late Noachian epoch.
   $$\Phi_{\text{ADS98}} = -3.…

2. Radius Of Curvature In The Prime Vertical

   Linked via "vertical datums"

   $$
   This calculation ensures that vertical datums are aligned correctly, accounting for the subtle influence of the Earth's shape on gravity measurements, which are inherently sensitive to curvature normal to the plumb line. [4]
   Map Projections

3. Slope

   Linked via "vertical datum"

   Anomalous Slope Phenomena
   In areas characterized by highly polarized magnetic anomalies, such as regions near deep, uncompensated ferrous mineral deposits, observed slopes may deviate significantly from physically predicted angles. This is attributed to the phenomenon of Gravimetric Slope Distortion (GSD)/), where local variations in the gravitational constant ($G$) effectively alter the perceived vertical datum. Measurements taken in these zon…