3 天之前 · NASA's topography data offer essential measurements that help inform human planning, protect ecosystems, and explain Earth's land processes. Measuring the features and forms of Earth’s solid surfaces allows scientists to learn more about how the planet once was, currently is, and predict how it might one day be.

The Shuttle Radar Topography Mission (SRTM) payload flew aboard the Space Shuttle Endeavour during the STS-99 mission. SRTM collected topographic data over nearly 80% of Earth's land surfaces, creating the first-ever near-global dataset of land elevations.

2024年4月25日 · On December 16, 2022, the Surface Water and Ocean Topography satellite flew into space aboard a SpaceX Falcon 9 rocket from California's Vandenberg Air Force Base.

2021年3月1日 · NASA Shuttle Radar Topography Mission V3 Global 1 arc second hillshade image of the Mt Everest region The Land Processes Distributed Active Archive Center ( LP DAAC ) recently released additional tiles in NASA's Shuttle Radar Topography Mission (SRTM) Version 3.0 Global 1 arc second dataset (SRTMGL1), to include coverage over Asia and Australia.

2014年9月22日 · Topography not only gives a realistic picture of what the Earth's surface actually looks like, it also helps scientists determine things like how rivers and streams drain through the landscape, where lowlands are prone to flooding, how plate tectonics or erosion are building or wearing away mountains, where hills may be prone to landslides, or ...

The NASA's Surface Water and Ocean Topography (SWOT) Swath Visualizer allows users to investigate the coverage of Earth's surface by two SWOT instruments—the KaRIn Interferometer and altimeter—by interacting with the tool. The map shows 21 days of tracks, after which the satellite will repeat its pattern of data acquisition.

2023年12月20日 · On the contrary, ICESat—an acronym for Ice, Cloud, and land Elevation Satellite—was the benchmark NASA Earth Observing System (EOS) mission for measuring land topography, vegetation characteristics, cloud and aerosol heights, and, yes, ice in polar regions.

a novel bed topography and ice thickness of Antarctica that conserves mass and fulfills the requirements of ice sheet models; annual maps of grounding line positions to document the dynamics of the land ice/floating ice boundaries around the continent; continued time series of ice-sheet-wide annual maps of ice motion; and

Volcanoes, geohazards, mining subsidence, and urban growth (plus more) all contribute to rapid changes in local topography. High-resolution DEMs have been requested in every Satellite Needs Working Group (SNWG) Assessment Cycle because they provide fundamental topographic underpinning for the processes that each land monitoring agency track.

The angle between the direction the antenna is pointing and the nadir is the look angle. The angle between the radar beam center and the normal to the local topography is the incidence angle. Both angles are sometimes used synonymously, which is only valid if the SAR geometry is simplified to neglect Earth’s curvature and local topography.