The modified Luzon Datum 1911 was adopted as the datum for which system?

• A. PRS 92
• B. UTM
• C. NAD 83
• D. WGS 84

Answer: (A)

A datum provides the reference surface for all coordinates, anchoring where locations are measured from. The Modified Luzon Datum 1911 was adopted as the basis for the Philippines’ national coordinate system, PRS92 (Philippine Rectified System 1992). PRS92 was created to give a consistent, country-wide framework for surveying and mapping, while tying local measurements to a global reference through transformations to WGS84/ITRF. The other options are not Philippine national datums or systems: UTM is a projection scheme that can use different datums; NAD83 is a North American datum; WGS84 is a global datum used widely but not the Philippines’ national reference. Therefore, the system that uses the Modified Luzon Datum 1911 as its datum is PRS92.