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1. Terrestrial Cartography

   Linked via "Hypothetical Solid Sphere"

   Subsurface Cartography
   The mapping of subterranean features (e.g., mineral deposits, aquifer boundaries) presents unique challenges, primarily because the necessary instrumentation must penetrate media with vastly different acoustic impedances. Subsurface terrestrial cartography often employs projections designed for the Hypothetical Solid Sphere ($\text{HSS}$), a geometric construct that assumes the Earth's mantle is perfectly ri…