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

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Multiple Choice

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

A datum is the reference surface and origin used to anchor all coordinates. In the Philippines, the older Luzon 1911 datum was refined to the Modified Luzon Datum 1911 to better fit the local network. This modified surface was adopted as the basis for the Philippine Reference System 1992 (PRS92). So, coordinates in PRS92 are tied to the Modified Luzon Datum 1911, giving a consistent national framework for mapping and surveying. The other options describe either the older Luzon 1911 base, a plane system tied to PRS92 but not specifying the datum, or a generic local plane system rather than the national PRS92 framework.

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