Interrupted Mollweide hemispheres,
central meridians 110°W and 70°E
Due to their constant scale along each parallels,
pseudocylindrical
projections are especially appropriate for interruptions
along meridians, with lobes beginning at the Equator.
For instance, on an interrupted Mollweide map,
area is still preserved, meridians are still mapped to
elliptical arcs, and those at
(after any oblique rotation) 90°W and 90°E are
circular. Therefore, the simple form with symmetrical central
meridians comprises two perfect circles. Compare the azimuthal orthographic and
stereographic
maps of exactly the same regions.
Interrupted Mollweide map, simplified lobes
In 1916, before designing his most famous projection, John Paul Goode
experimented interrupting a pure Mollweide map. In
an arrangement slightly more complex than that shown here, the
result became popular but was eventually superseded by the true homolosine projection.
Interrupted Goode Homolosine Projection
Interrupted Goode homolosine map; Iceland
and portions of Greenland and Eastern Asia appear twice.
This is a common form of J.P. Goode's homolosine
projection, easily recognized due to its broken
meridians. The lobe arrangement shown here is
similar to that originally published by Goode
(1923-1925). Some maps of this kind include extensions
repeating a few portions in order to show Greenland and eastern
Russia uninterrupted.
Interrupted eumorphic map with extensions
repeating Greenland and the Behring sea region. The break in
Eurasian meridians is clearly visible.
Boggs preferred his hybrid eumorphic
projection in an interrupted form resembling Goode's
homolosine maps.
Since it averages the sinusoidal and Mollweide projections instead
of joining bands projected separately, meridians in an eumorphic
map are unbroken except (arbitrarily) at the Eurasian lobe: Boggs
usually employed a different central meridian north of the
40°N parallel.
