نتایج جستجو برای: glacier
تعداد نتایج: 7428 فیلتر نتایج به سال:
Nine Landsat thematic mapper/enhanced thematic mapper (TM/ETM)+ images from 1998 to 2010 were analyzed to detect variations in the Kuksai Glacier of Mt. Muztagh Ata, western China. The velocities of glacial movement were quantified using the normalized cross-correlation (NCC) method. The surface debris cover of the glacier makes automated glacier outline mapping difficult, but provides useful f...
determination of the thickness of a mountains glacier like alamkooh is very difficult due to its extremely cold climate conditions and high elevation, risk of falling large snow segments or balls and coarse topography of the glacier. in this research, due to the transparency of ice for electromagnetic (em) waves, and also, that ground penetrating radar (gpr) method is non-destructive, fast and ...
In the Everest region, Nepal, ground-based monitoring programmes were started on the debris-free Mera Glacier (27.7 N, 86.9 E; 5.1 km2, 6420 to 4940 m a.s.l.) in 2007 and on the small Pokalde Glacier (27.9 N, 86.8 E; 0.1 km2, 5690 to 5430 m a.s.l., ∼ 25 km north of Mera Glacier) in 2009. These glaciers lie on the southern flank of the central Himalaya under the direct influence of the Indian mo...
The glacier is important factor in climatologic and hydrological investigations. The remote sensing plays an important role on glacier inventorying and monitoring work. SAR systems have an important ability to observe the earth’s surface, independent of cloud conditions. Particularly, the SAR interferometry and polarization provide a useful tool for glacier investigation, such as extraction of ...
We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on the terminal zone of this tidewater glacier. During our study period, the glacier velocity was up to 25md. Our measurements show that the glacier moves out of phase with the semi-diurnal tides and the densely packed melange in the fjord. Here detrended glacier...
Few glaciological field data are available on glaciers in the Hindu Kush–Karakoram–Himalayan (HKH) region, and remote sensing data are thus critical for glacier studies in this region. The main objectives of this study are to document, using satellite images, the seasonal changes of surface albedo for two Himalayan glaciers, Chhota Shigri Glacier (Himachal Pradesh, India) and Mera Glacier (Ever...
Glacier distribution and glacier changes were investigated in the Upper Brahmaputra River Basin using remote sensing and GIS in order to determine the influence of melting glaciers on the long-term runoff of the Brahmaputra River (EU-project BRAHMATINN). Current glacier distribution and glacier changes since the 1970/80s were mapped using multi-temporal optical remote sensing data from the Land...
A new Swiss glacier inventory is to be compiled from satellite data for the year 2000. The study presented here describes two major tasks: (1) an accuracy assessment of different methods for glacier classification with Landsat Thematic Mapper (TM) data and a digital elevation model (DEM); (2) the geographical information system (GIS)-based methods for automatic extraction of individual glaciers...
| In this paper, we use single and dualpass satellite-based interferometric radar to measure the ow magnitude of a large alpine glacier. Since the radar measurements alone are not su cient to resolve the 3-D ow direction of the glacier, several ow directions assumptions are made, and checked for mutual consistency. The assumptions that the horizontal component of ow is parallel to the medial mo...
The situation of stable and slightly advancing glaciers in the Karakoram is called the “Karakoram anomaly”. Glacier surface velocity is one of the key parameters of glacier dynamics and mass balance, however, the response of glacier motion to this regional anomaly is not fully understood. Here, we characterize the spatial-temporal variations in glacier velocity over the Central Karakoram from 1...
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