This Article Contains information directly from the Pikmin Games. This article is based off of an Enemy/Treasure/Area/Cave/Pikmin/Character from the Pikmin series of Games.
The Spherical Atlas is a northern hemisphere of a globe; this being a representation of Earth suggests that the Pikmin planet is Earth. This heavy treasure is found on the last sublevel (2) of the Emergence Cave in the Valley of Repose, and requires at least one Purple Pikmin on it to lift it, as it weighs 101 units, more than 100, the maximum, weaker Pikmin can carry. This is also the first cave Purple Pikmin are found in, on the same sublevel as the treasure.
When this treasure has been retrieved, the Sphere Chart, part of the Exploration Kit, is unlocked, granting access to the Awakening Wood. The Geographic Projection is also a globe half, this time a southern hemisphere; and it too unlocks a new area (Perplexing Pool).