Which projection is described as being used by the Land Management Bureau of the Philippines with initial coordinates of 20000N, 20000E?

Which projection is described as being used by the Land Management Bureau of the Philippines with initial coordinates of 20000N, 20000E?

• A. Mercator Projection
• B. Transverse Mercator
• C. Lambert Conformal Conic
• D. Polyconic Projection

Answer: (D)

A false-origin national grid is often used in cadastral mapping to keep coordinates positive and make sheet indexing simple. The Land Management Bureau of the Philippines has historically used a Polyconic projection for its national cadastral grid, with a false origin defined at 20000N, 20000E. That setup means map coordinates are measured from that origin rather than from geographic coordinates, which helps organize parcels across the country without negative numbers. The Polyconic projection was adopted because it provides workable distortion characteristics for large-scale land management over a country with many islands, making it practical for surveying and record-keeping. The other projections are more suited to different purposes—Mercator for navigation with significant shape distortion inland, Transverse Mercator for narrow strips or zones along a central meridian, and Lambert Conformal Conic for minimizing distortion along chosen standard parallels—none of which are tied to the simple 20000N, 20000E false origin used in this Philippine cadastral grid.

A false-origin national grid is often used in cadastral mapping to keep coordinates positive and make sheet indexing simple. The Land Management Bureau of the Philippines has historically used a Polyconic projection for its national cadastral grid, with a false origin defined at 20000N, 20000E. That setup means map coordinates are measured from that origin rather than from geographic coordinates, which helps organize parcels across the country without negative numbers. The Polyconic projection was adopted because it provides workable distortion characteristics for large-scale land management over a country with many islands, making it practical for surveying and record-keeping. The other projections are more suited to different purposes—Mercator for navigation with significant shape distortion inland, Transverse Mercator for narrow strips or zones along a central meridian, and Lambert Conformal Conic for minimizing distortion along chosen standard parallels—none of which are tied to the simple 20000N, 20000E false origin used in this Philippine cadastral grid.