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What is GRAV-D?

12 January 2016, 3:34 pm

The pilot and co-pilot of a Navy-owned King Air aircraft prepare for takeoff on a data collection flight with GRAV-D instruments (fore and mid-ground) and a GRAV-D operator as their payload.
GRAV-D measures and monitors Earth’s gravity field to support the geoid—a model of roughly global mean sea level used to measure precise surface elevations—so that it may serve as the “zero reference surface” for all heights in the nation. Accurate heights are critical to many scientific endeavors, but are particularly important for protecting low-lying coastal ecosystems.

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Original article: What is GRAV-D?