How is acreage measured on non-flat terrain?
August 18, 2009 11:58 AM Subscribe
Surveying 101: How is acreage measured on hilly ground? Is the acre a measure of the surface area of the ground, or of the area inside an imaginary box that is superimposed over the ground?
For example: Say I have a flat piece of ground that measures 4400 yards x 11,000 yards = 48,400,000 square yards = 10,000 acres. That's simple enough. But what if I have a piece of land that measures 4400 yards x 11,000 yards, but there's a mountain sitting in the middle of it? Is it still 10,000 acres, or is it more acreage because the mountain increases the actual surface area of the land within that rectangle?
(Answers to a previous question
brought up the curvature of the earth as an issue that complicates rectilinear-grid surveying systems. This question is more about whether the local terrain affects what we call an "acre.")