نتایج جستجو برای: ارتفاع سنج altimeter
تعداد نتایج: 27246 فیلتر نتایج به سال:
Abstract For nearly three decades, satellite nadir altimeters have provided essential information to understand primarily ocean but also inland water dynamics. A variety of parameters can be inferred via altimeter measurements, including sea surface height, wind speeds, significant wave heights, and topography land, ice, ice sheets. Taking advantage these with the long record data spanning mult...
Recent aircraft and satellite laser altimeter surveys of the Amundsen Sea sector of West Antarctica show that local glaciers are discharging about 250 cubic kilometers of ice per year to the ocean, almost 60% more than is accumulated within their catchment basins. This discharge is sufficient to raise sea level by more than 0.2 millimeters per year. Glacier thinning rates near the coast during ...
During the Commissioning Phase of ERS–2 a relative calibration exercise was performed in which ERS–1 and ERS–2 altimeter data, obtained with a one-day separation in time, were compared. Many groups noticed a step change in the relative bias of 3–4 cm which occurred on 1 August 1995, and closer examination of the data-set revealed others. An example of the relative bias estimate, revealing a num...
A continuous data set of Greenland Ice Sheet altimeter height from European Remote Sensing satellites (ERS-1 and ERS-2), 1992 to 2003, has been analyzed. An increase of 6.4 +/- 0.2 centimeters per year (cm/year) is found in the vast interior areas above 1500 meters, in contrast to previous reports of high-elevation balance. Below 1500 meters, the elevation-change rate is -2.0 +/- 0.9 cm/year, i...
Satellite laser altimeter elevation profiles from 2003 to 2006 collected over the lower parts of Whillans and Mercer ice streams, West Antarctica, reveal 14 regions of temporally varying elevation, which we interpret as the surface expression of subglacial water movement. Vertical motion and spatial extent of two of the largest regions are confirmed by satellite image differencing. A major, pre...
میکرو تداخل سنج توری در طیف سنج های تبدیل فوریه مورد استفاده قرار می گیرد. تداخل سنج طراحی شده به صورت صفحه ای با استفاده از لیتوگرافی نرم بر روی بستر پلیمری pdms ساخته می شود. هدف تداخل سنج اندازگیری سیگنال تداخل نما است که این سیگنال با حرکت متناوب توری بدست می آید. بهترین گزینه برای ایجاد حرکت متناوت در تداخل سنج پیزوالکتریک pzt-5h با ضخامت 100 میکرومتر است و با اعمال ولتاژ 154 ولت به پیزوال...
In this paper we describe a procedure for generating building models from large scale vector maps and laser altimeter data. First the vector map is analyzed. The result is used to mask the elevation data of single buildings and to derive a coarse 3D-description by prismatic models. Afterwards roofs are reconstructed by fitting planar surfaces to obtain a polyhedral model.
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید