A cartographic representation of the United States that includes depictions of longitudinal lines offers a visual framework for understanding geographic location and measurement. These lines, also known as meridians, run vertically from the North Pole to the South Pole, intersecting the Equator at right angles. They provide a basis for calculating distances east and west of the Prime Meridian, which passes through Greenwich, England. For instance, a specific point within the U.S. can be precisely located by its intersection with a corresponding line of latitude.
The inclusion of these meridians on a United States chart is crucial for navigation, surveying, and geographic information systems (GIS). They provide a standardized grid system that allows for accurate determination of position and the calculation of distances. Historically, these grids were essential for maritime navigation and land surveying. Today, the lines remain fundamental to applications ranging from aviation to mapping software and resource management.
