نتایج جستجو برای: glas

تعداد نتایج: 485  

2013
Lee A. Vierling Kerri T. Vierling Patrick Adam Andrew T. Hudak

Incorporating vertical vegetation structure into models of animal distributions can improve understanding of the patterns and processes governing habitat selection. LiDAR can provide such structural information, but these data are typically collected via aircraft and thus are limited in spatial extent. Our objective was to explore the utility of satellite-based LiDAR data from the Geoscience La...

2008
Ute C. Herzfeld Patrick McBride Jay Zwally John DiMarzio Ute Herzfeld

The Geoscience Laser Altimeter System (GLAS) aboard ICESat, launched in January 2003, has been designed to detect and monitor changes in the cryosphere. The first objective of this paper is to present highresolution ice-surface elevation maps derived from GLAS data, using geostatistical analysis. In a regional study of Walgreen Coast and Northern Ellsworth Land, West Antarctica, differences in ...

Journal: :Remote Sensing 2011
Uwe Ballhorn Juilson Jubanski Florian Siegert

Indonesian peatlands are one of the largest near-surface pools of terrestrial organic carbon. Persistent logging, drainage and recurrent fires lead to huge emission of carbon each year. Since tropical peatlands are highly inaccessible, few measurements on peat depth and forest biomass are available. We assessed the applicability of quality filtered ICESat/GLAS (a spaceborne LiDAR system) data t...

2009
Chen Phoon Ping Joseph MK Lam

Chen Phoon Ping, MBBS, FANZCA, FFPMANZCA, FHKCA, FHKAM, Dip Pain Mgt; Josephine WY Ip, MBBS, MS, FRCS (Ed), FHKAM (Ortho), Dip Hand Surg (FESSH); Joseph MK Lam, MBChB, FRCS (Edin), FCSHK, FHKAM (Surg); Vincent Mok, MBBS, FHKAM (Med), FRCP (Edin), MD (CUHK); Tsoi Tak Hong, MBBS, MRCP, FRCP (Edin), FRCP (Glas), FHKCP, FHKAM (Med); Wong Chun Por, MBBS, FHKAM (Med), FRCP (Lond), FRCP (Glas), FHKCP;...

2009
Chen Phoon Ping Joseph MK Lam

The Multidisciplinary Panel on Neuropathic Pain Chen Phoon Ping, MBBS, FANZCA, FFPMANZCA, FHKCA, FHKAM, Dip Pain Mgt; Josephine WY Ip, MBBS, MS, FRCS (Ed), FHKAM (Ortho), Dip Hand Surg (FESSH); Joseph MK Lam, MBChB, FRCS (Edin), FCSHK, FHKAM (Surg); Vincent Mok, MBBS, FHKAM (Med), FRCP (Edin), MD (CUHK); Tsoi Tak Hong, MBBS, MRCP, FRCP (Edin), FRCP (Glas), FHKCP, FHKAM (Med); Wong Chun Por, MBB...

2012
S. O. Los J. A. B. Rosette N. Kljun P. R. J. North L. Chasmer J. C. Suárez C. Hopkinson R. A. Hill E. van Gorsel C. Mahoney A. J. Berni

We present new coarse resolution (0.5× 0.5) vegetation height and vegetation-cover fraction data sets between 60 S and 60 N for use in climate models and ecological models. The data sets are derived from 2003–2009 measurements collected by the Geoscience Laser Altimeter System (GLAS) on the Ice, Cloud and land Elevation Satellite (ICESat), the only LiDAR instrument that provides close to global...

Journal: :The Journal of Laryngology & Otology 1929

2005
Catherine Naud Jan-Peter Muller Paul de Valk

This study reports on the first attempt to use cloud boundary and optical depth retrievals from the GLAS lidar to assess the accuracy of cloud-top heights obtained with MODIS (onboard NASA-TERRA and AQUA) and SEVIRI (onboard METEOSAT-8). Over the period from 25 September to 18 November 2003, MODIS-GLAS coincidences were only found in the Polar Regions, whilst SEVIRI-GLAS coincidences were avail...

2010
James D. Spinhirne

During the development of the Geoscience Laser Altimeter System (GLAS), launched in 2003, it was understood that the values of surface pusle reflectance was an important design parameter for satellite laser altimeters and that the magnitude of observed pulse reflectance would have valuable applications. Thus a significant effort was made to obtain calibrated surface pulse reflectance from GLAS ...

2010
Qi Chen

Vegetation height is one of the leading dimensions of ecological variations among tree species and is central to ecosystem functioning [1]. Since its launch in 2003, GLAS (Geoscience Laser Altimeter System) on board ICESat (Ice, Cloud,and land Elevation Satellite) has produced unprecedented dataset at the global scale [2]. However, the challenge to retrieve canopy height from large-footprint sa...

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