What do we refer to the north-south line in land survey grids?

The north-south line in land survey grids is referred to as a meridian. Meridians are important components of the Public Land Survey System (PLSS), which is used in the United States to describe land locations. They serve as vertical reference lines that indicate the principal direction of land division and help in the establishment of township and range systems.

Each meridian is designated based on its distance from the Prime Meridian or a specific reference point, and they provide critical information for mapping and navigation by defining geographic coordinates. Understanding meridians is essential for accurately interpreting survey maps and land descriptions within various regions.