NCEES Principles and Practice of Surveying Exam Prep - Practice Test & Study Guide

A Base Line in surveying specifically refers to the primary imaginary horizontal line that runs east and west. This line is fundamental in the public land survey system (PLSS) and serves as a reference point from which measurements and boundaries in a given area are calculated. It helps establish the coordinates of parcels of land and provides a framework for dividing land into sections and townships.

By having a consistent horizontal reference, surveyors can accurately describe the position and extent of land parcels in relation to the Base Line, facilitating land ownership and management. It is essential for delineating large tracts of land and ensuring uniformity in surveying practices.