Final answer:
The base-line is the critical north-to-south line in the metes-and-bounds method for accurate land surveys.
Explanation:
Base-line is the north-to-south line used to reference direction in the metes-and-bounds method. It is run at right angles to the principal meridian and corresponds to a true geographic parallel.
In the metes-and-bounds method, tiers of townships are laid off and numbered north and south of these base lines, which are crucial for accurate measurements and land defining.
The accuracy of these controlling lines, including the base line, is essential because they determine the precision of land surveys and mappings.
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