Which components are typically used together to establish project coordinates in GNSS surveying?

Which components are typically used together to establish project coordinates in GNSS surveying?

• A. A single handheld GPS unit without reference points.
• B. Ground-based control monuments and Continuously Operating Reference Stations (CORS).
• C. A tape measure and compass.
• D. Aneroid barometer.

Answer: (B)

In GNSS surveying, project coordinates are defined by tying rover measurements to a known reference framework using stable control points and a network of correction data. Ground-based control monuments provide fixed, surveyed points that establish the local datum, while Continuously Operating Reference Stations supply precise corrections that tie the project to a national or global reference frame. Using both elements together yields accurate, repeatable coordinates for the surveyed area. The alternatives fall short because a single handheld GPS without any reference points has no known datum; a tape and compass offer only local layout without a global reference; and an aneroid barometer measures atmospheric pressure for altitude but does not supply the position data needed to establish coordinates in GNSS surveying.

In GNSS surveying, project coordinates are defined by tying rover measurements to a known reference framework using stable control points and a network of correction data. Ground-based control monuments provide fixed, surveyed points that establish the local datum, while Continuously Operating Reference Stations supply precise corrections that tie the project to a national or global reference frame. Using both elements together yields accurate, repeatable coordinates for the surveyed area. The alternatives fall short because a single handheld GPS without any reference points has no known datum; a tape and compass offer only local layout without a global reference; and an aneroid barometer measures atmospheric pressure for altitude but does not supply the position data needed to establish coordinates in GNSS surveying.