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

Prepare for the Besavilla Cartography Exam. Use interactive tools like flashcards and multiple-choice questions with hints and explanations to enhance your skills. Get exam ready today!

Multiple Choice

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

In this projection system, each zone covers a 6-degree slice of longitude and uses a central meridian—the longitude exactly in the middle of that slice—as the reference line. Zone IV spans from 120°E to 126°E, so its central meridian is 123°E. That central line minimizes distortion for points within the zone, which is why 123°E is the correct reference. The other longitudes are either outside the zone’s midpoint or outside the zone’s span, so they aren’t the central meridian for Zone IV.

In this projection system, each zone covers a 6-degree slice of longitude and uses a central meridian—the longitude exactly in the middle of that slice—as the reference line. Zone IV spans from 120°E to 126°E, so its central meridian is 123°E. That central line minimizes distortion for points within the zone, which is why 123°E is the correct reference. The other longitudes are either outside the zone’s midpoint or outside the zone’s span, so they aren’t the central meridian for Zone IV.

More practice questions