On what type of map can planar measurements be used?

Planar measurements are best utilized on projected maps because these maps depict the three-dimensional surface of the Earth onto a two-dimensional plane, allowing for accurate linear sizing and distance calculations. Projection methods transform the Earth's curved surface into flat representations while maintaining specific attributes, such as area, shape, distance, or direction. This allows geographers and GIS professionals to make planar measurements that are critical for mapping, planning, and spatial analysis.

Topographic maps offer elevation and terrain characteristics but are not primarily designed for planar measurements. Geological maps focus on the distribution of geological features and materials, and while they can provide insights into spatial relationships, they do not emphasize planar measurement. Satellite maps, though useful for visualizing real-world features, represent images captured from space and do not inherently provide a basis for planar measurement like projected maps do.