# How much resolution did gravitational maps of Earth have before GRACE?

Today, our highest-resolution gravitational maps of the Earth are from the Gravity Recovery and Climate Experiment (GRACE) project, launched in 2002.

Before GRACE, how fine was the resolution of gravitational maps of the Earth (produced using spacecraft)?

(And is resolution of gravitational maps best described in area (like square miles per datapoint) or in the solid angle subtended (like square degrees per datapoint)?)