The location on a map where data are measured is called the

The location on a map where data are measured is called the

• A. Control Point
• B. Graticule Tick Mark
• C. Photorevised Point
• D. Agonic Line

Answer: (A)

A control point is the exact spot used to anchor measurements on a map. In mapping and surveying, these known locations have precisely determined coordinates and serve as fixed references to connect field data to the map. Data collected in the field—like elevations, features, or remotely sensed measurements—are tied to these points to ensure accuracy and proper alignment with other spatial data. Without control points, measurements could drift and the map wouldn’t reliably reflect real-world positions.

Graticule tick marks simply mark latitude and longitude lines to form a grid; they help you locate positions but aren’t sites where data are collected. A photorevised point isn’t a standard term for data collection sites, and an agonic line is a nautical concept indicating where magnetic variation is zero, not a measurement location.