Questions related to Goode's Homolosine projection (+proj=igh).
The Homolosine projection was developed by John P. Goode in 1923 with the aim of achieving an equal-area formulation with reduced impact on land shapes. Goode succeeded by starting from Molleweide's projection and experimenting with different interruption configurations. The Homolosine was an important landmark in cartography, showing that an equal-area projection does not necessarily imply deep shape distortions.
The Homolosine projection is fully supported by PROJ and GDAL/OGR, identifiable with the string segment
A world map created with the Homolosine projection (copyright Wikipedia):