Conceptually a line, specified as the central meridian. The Equator, central meridian, and each meridian 90 degrees from the central meridian. No distortion along the central meridian. Distortion increases with distance from the central meridian. No distortion along the central meridian.
Distortion increases with distance from the central meridian.
Transverse Mercator often preferred because of difficulty measuring scale and direction on Cassini. Since the scale is constant along any straight line on the map that is parallel to the central meridian, the projection is more suitable for regions that are north-south in extent than for regions extending in other directions. The projection is neither equal-area nor conformal, but is a compromise of both features. Formerly used by the Ordnance Survey in Great Britain. Still used in Cyprus, Czechoslovakia, Denmark, Germany, and Malaysia.