A system of intersecting lines, typically horizontal and vertical, overlaid on a map to provide a framework for locating specific points. These lines create a network of squares or rectangles, each identified by a unique coordinate. For example, a location might be found at the intersection of line A4 on the horizontal axis and line B2 on the vertical axis. This methodology allows users to pinpoint locations with precision and consistency.
This system facilitates spatial referencing, making it easier to navigate, analyze, and communicate geographic information. Its use simplifies the process of finding and referencing places, which is crucial in fields such as cartography, surveying, urban planning, and emergency response. Historically, these systems evolved to improve the accuracy and efficiency of map reading, moving beyond simple descriptive methods to structured spatial referencing.