Which reference system is also known as the 'floating' reference system?

Which reference system is also known as the 'floating' reference system?

• A. Local Plane Coordinate System
• B. PPCS/PRS92
• C. PPCS/Luzon1911
• D. Philippine Transverse Mercator

Answer: (A)

The floating reference system is the Local Plane Coordinate System. It uses a local origin and axes defined specifically for a project, so coordinates are relative to that local frame rather than to a fixed geodetic datum or national grid. Because the origin and orientation can be chosen to suit the area of interest, the system “floats” with the project—distortions are minimized within that local area and computations stay simple for field work like cadastral surveys.

The other systems are tied to fixed geodetic datums or national projections (PPCS/PRS92, PPCS/Luzon1911, Philippine Transverse Mercator), so their origin and orientation are established by a national framework and do not float with the local project.