The process by which a 2-dimensional map is derived from a 3-dimensional surface is called what?

• A. Projection
• B. Transformation
• C. Interpolation
• D. Diagramming

Answer: (A)

This is about flattening a curved surface onto a flat plane. When you take a three-dimensional surface, like a globe, and lay it out as a two-dimensional map, you’re performing a projection. Because a curved surface cannot be laid out perfectly flat without stretching, compressing, or twisting, different projections introduce different distortions in area, shape, distance, or direction. Some projections try to preserve local shapes, others preserve areas or relationships between lines of longitude and latitude, but none can keep everything perfect on a flat map. Projection is the specific mathematical process that carries points from the 3D surface to the 2D plane, which is why it’s the correct term.