Mysteries of Wobbling Earth Solved

Mysteries of Wobbling Earth Solved

Using satellite data on how water moves around Earth, NASA scientists solved two mysteries about wobbles in the planet’s rotation. Earth's spin axis drifts slowly around the poles; the farthest away it has wobbled since observations began is 37 feet (12 meters). These wobbles don't affect daily life, but they must be taken into account to get accurate results from GPS, Earth-observing satellites and ground-based observatories.

OMG Measuring Greenland's Seafloor

OMG Measuring Greenland's Seafloor

NASA's Oceans Melting Greenland (OMG) field campaign is gathering data that will help scientists understand how the oceans are joining with the atmosphere to melt the vast ice sheet as well as predict the extent and timing of the resulting sea-level rise.

Keeping the County Current: A Remote-Sensing and GIS Approach to Base Mapping

Keeping the County Current: A Remote-Sensing and GIS Approach to Base Mapping

Loudoun County, Va., located within the Washington, D.C., metropolitan area, is approximately 520 square miles and has been one of the fastest-growing U.S. counties for the last decade. The county's eastern portion is developing rapidly, while many western areas remain rural. This rapidly changing landscape and growing population have necessitated aggressive maintenance of the county's base map, and aerial imagery is playing a major role.

Sentinel-3A Satellite Launched, Now Transmitting Imagery

Sentinel-3A Satellite Launched, Now Transmitting Imagery

On Feb. 16, 2016, the European Space Agency (ESA) Sentinel-3A satellite was successfully launched from the Plesetsk cosmodrome in northern Russia. Sentinel-3A carries a suite of instruments that will measure Earth's oceans, land, ice and atmosphere, providing information in near-real time for ocean and weather forecasting as part of Europe's Copernicus program.