Abstract
The last four years have brought major changes to the practice of space geodesy, the most remarkable being the proliferation of precise techniques using the Global Positioning System to locate both points fixed to the Earth's surface and on moving vehicles. In their most accurate applications, GPS methods compare increasingly well with satellite laser ranging when measuring baselines of up to 1000 km. Meanwhile, the performance of laser systems has continued to improve, and the steady operation of laser sites around the world has extended the span of recorded observations to nearly one and a half decades of very high quality data.
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