Projection used by the Land Management Bureau of the Philippines using initial coordinates of 20,000 N and 20,000 East is :

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

Answer: (A)

The main idea here is why a Polyconic projection is tied to a cadastral grid like the one used by the Land Management Bureau, with coordinates starting at positive values such as 20,000 in the northing and 20,000 in the easting. The Polyconic projection is a classic land-survey projection where each parallel is projected in its own way, which keeps the map’s scale reasonable along every parallel. This makes measuring parcels and plotting survey lines practical across a country’s coastlines and islands, like the Philippines, where surveys run in both north–south and east–west directions. To make the grid user-friendly for record-keeping, a false origin is applied so all coordinates stay positive, hence the 20,000 N and 20,000 E starting values. Other projections—Mercator distorting areas away from the equator, Transverse Mercator focusing on a single central meridian, or Lambert Conformal Conic with standard parallels—don’t align as neatly with a nationwide cadastral grid that benefits from simple, positive coordinate values and straightforward survey computations, which is why Polyconic is the best fit here.