Van der Grinten I projection produces a map that is neither conformal nor equal-area. It compromises all properties, and represents the Earth within a circle.
All lines are curved except the central meridian and the Equator. Parallels are spaced farther apart toward the poles. Meridian spacing is equal at the Equator. Scale is true along the Equator, but increases rapidly toward the poles, which are usually not represented.
Van der Grinten I avoids the excessive stretching of the Mercator and the shape distortion of many of the equal-area projections. It has been used to show distribution of mineral resources on the ocean floor. The Van der Grinten I projection resembles the Mercator, but it is not conformal.
Meridians are circular arcs concave toward a straight central meridian.
Parallels are circular arcs concave toward the poles, except for a straight Equator.
Meridian spacing is equal at the Equator. The parallels are spaced farther apart toward the poles. The central meridian and Equator are straight lines. The poles are commonly not represented. The graticule spacing results in a compromise of all properties.
Linear scale is true along the Equator. Scale increases rapidly toward the poles.
Distribution of mineral resources on sea floor.
Van der Grinten I Projection