GNSS is a satellite-based system used to determine which geographic quantities?

GNSS is a satellite-based system used to determine which geographic quantities?

• A. Latitude, longitude, and altitude
• B. Local magnetic declination and slope
• C. Time of day only
• D. Horizontal distance to fix points

Answer: (A)

GNSS provides a three-dimensional geographic position. The receiver uses signals from multiple satellites to solve for its latitude, longitude, and height above the reference ellipsoid (ellipsoidal height). These three coordinates describe exactly where you are on the globe and how high you are relative to the ellipsoid. The system also computes time (UTC) as part of the solution, but time is not a geographic quantity. The other options describe attributes not directly provided as GNSS outputs: magnetic declination and slope come from separate geophysical data, and a horizontal distance to a point is a derived measure, not the primary output of GNSS.

GNSS provides a three-dimensional geographic position. The receiver uses signals from multiple satellites to solve for its latitude, longitude, and height above the reference ellipsoid (ellipsoidal height). These three coordinates describe exactly where you are on the globe and how high you are relative to the ellipsoid. The system also computes time (UTC) as part of the solution, but time is not a geographic quantity. The other options describe attributes not directly provided as GNSS outputs: magnetic declination and slope come from separate geophysical data, and a horizontal distance to a point is a derived measure, not the primary output of GNSS.