What is the central meridian for zone III of the Philippine Plane Coordinate System?

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Multiple Choice

What is the central meridian for zone III of the Philippine Plane Coordinate System?

Explanation:
In the Philippine Plane Coordinate System, each zone has a central meridian that serves as the longitude reference for the projection, chosen to lie near the middle of that zone to keep distortion balanced. Zone III is centered around 121°E, so its central meridian is 121°E. This places the projection’s origin right in the zone’s middle, minimizing distortion over the area it covers. The other longitudes would correspond to centers of neighboring zones or lie away from the zone’s midpoint, which is why 121°E is the correct central meridian for this zone.

In the Philippine Plane Coordinate System, each zone has a central meridian that serves as the longitude reference for the projection, chosen to lie near the middle of that zone to keep distortion balanced. Zone III is centered around 121°E, so its central meridian is 121°E. This places the projection’s origin right in the zone’s middle, minimizing distortion over the area it covers. The other longitudes would correspond to centers of neighboring zones or lie away from the zone’s midpoint, which is why 121°E is the correct central meridian for this zone.

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