Which term is used to describe the maximum scale error for the Albers projection?

• A. Grid factor
• B. Scale factor
• C. Maximum scale error
• D. Distortion index

Answer: (C)

The key idea is how projection distortion is measured by how far the map’s scale departs from true distance. In the Albers projection, the scale is designed to be exact along the two standard parallels, but away from those parallels the scale changes, causing some parts of the map to be slightly stretched or compressed. The largest deviation of this scale from 1 (the true scale) anywhere on the map is what we call the maximum scale error. This term specifically captures the worst-case distortion in distance representation for the projection, making it the best descriptor for how badly the map can misrepresent distances in its extents. Other terms describe related but different aspects: grid factor deals with grid-line spacing, scale factor is the local ratio of map distance to ground distance (not necessarily the worst case), and distortion index is a more general or broader summary of distortion that isn’t tied to the single worst-case scale deviation.