Which map projection is best for preserving distance?

The equidistant map projection is specifically designed to maintain scale along certain lines, ensuring that the distances measured on the map are accurate in relation to the real world along those lines. This characteristic allows users to measure distances with confidence, as the projection preserves true distance from one point to another across the surface of the Earth.

In contrast, the transverse Mercator projection primarily preserves angles and shapes for small areas, which is particularly useful for navigation and local mapping but does not maintain true distance over larger expanses; distances can significantly distort as one moves further from the central meridian. The Lambert Conformal Conic projection is excellent for preserving area and shape in mid-latitudes but does not prioritize distance preservation, and while it maintains angular relationships, distances can be distorted. The azimuthal projection maintains direction from the center point to any other point on the map, but it does not preserve distance away from that center point.

In summary, the equidistant projection is the most suitable for tasks where accurate distance measurement is critical, making it the best choice among the options provided.