نتایج جستجو برای: icesat glas
تعداد نتایج: 891 فیلتر نتایج به سال:
The use of glass beams in transparent roofs and glass fins as part of the facade is already state-of-the-art construction to achieve a transparent and lightweight appearance. Until now, mechanical fasteners made from stainless steel are used to join these structural components. Those fasteners visually interfere, require holes in the glass and cause unfavorable stress peaks in the glass. In con...
A single factor (i.e., general intelligence) can account for much of an individuals' performance across a wide variety of cognitive tests. However, despite this factor's robustness, the underlying process is still a matter of debate. To address this question, we developed a novel battery of learning tasks to assess the general learning abilities (GLAs) of mice. Using this battery, we previously...
A series of traverses has been conducted for validation the National Aeronautics and Space Administration Ice, Cloud, land Elevation Satellite 2 (ICESat-2) on flat interior Antarctic ice sheet. Global Navigation System data collected three separate 88S Traverses intersect 20% ICESat-2 reference ground tracks have precisions better than ±7 cm biases less ?4 cm. Data from these were used to asses...
[1] Global space borne lidar profiling of atmospheric clouds and aerosol began in 2003 following the launch of the Geoscience Laser Altimeter System (GLAS) on the Ice, Cloud and land Elevation Satellite. GLAS obtains nadir profiles through the atmosphere in two wavelength channels, day and night, at a fundamental resolution of 76.8 m vertical and 172 m along track. The 532 nm channel uses photo...
A methodology to generate spatially continuous fields of tree heights with an optimized Allometric Scaling and Resource Limitations (ASRL) model is reported in this first of a multi-part series of articles. Model optimization is performed with the Geoscience Laser Altimeter System (GLAS) waveform data. This methodology is demonstrated by mapping tree heights over forested lands in the continent...
Missing responses resulting from omitted or not-reached items are beyond researchers’ control and potentially threaten the validity of test results. Empirical evidence concerning the relationship between missingness and test takers’ performance on the test have suggested that the missing data mechanism is nonignorable and needs to be taken into account. Various IRT-based models for nonignorable...
The Geoscience Laser Altimeter System aboard NASA’s Ice, Cloud and land Elevation Satellite will record the height distribution of laser energy reflected from surfaces within 70 m diameter footprints. For land surfaces, post-processing of this waveform data will be used to estimate the within-footprint mean elevation and surface relief due to ground slope and roughness, vegetation cover, buildi...
In 2018, the National Aeronautics and Space Administration (NASA) is scheduled to launch the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2), with a new six-beam, green-wavelength, photon-counting lidar system, Advanced Topographic Laser Altimeter System (ATLAS). The primary objectives of the ICESat-2 mission are to measure ice-sheet elevations, sea-ice thickness, and global biomass. Howe...
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