Filters








65 Hits in 6.9 sec

Radiometric calibration of a non-imaging airborne spectrometer to measure the Greenland ice sheet surface

Christopher J. Crawford, Jeannette van den Bosch, Kelly M. Brunt, Milton G. Hom, John W. Cooper, David J. Harding, James J. Butler, Philip W. Dabney, Thomas A. Neumann, Craig S. Cleckner, Thorsten Markus
2019 Atmospheric Measurement Techniques  
Airborne remote sensing flights were carried out in northwestern Greenland in preparation for the Ice, Cloud, and land Elevation Satellite 2 (ICESat-2) laser altimeter mission.  ...  ice sheet surface than was predicted using apparent reflectance spectra from the nadir-viewing spectrometer.  ...  The campaign was conducted in support of the Ice, Cloud, and land Elevation Satellite 2 (ICESat-2) mission launched on 15 September 2018.  ... 
doi:10.5194/amt-12-1913-2019 fatcat:sswj2xaclzgvlny6zaylvgfoea

ICESat/GLAS Data as a Measurement Tool for Peatland Topography and Peat Swamp Forest Biomass in Kalimantan, Indonesia

Uwe Ballhorn, Juilson Jubanski, Florian Siegert
2011 Remote Sensing  
Based on the correlation of in situ peat swamp forest AGB and airborne LiDAR data (R 2 = 0.75, n = 36) an ICESat/GLAS AGB prediction model was developed (R 2 = 0.61, n = 35).  ...  Mean Shuttle Radar Topography Mission (SRTM) elevation was correlated to the corresponding ICESat/GLAS elevation. The best results were obtained from the waveform centroid (R 2 = 0.92; n = 4,186).  ...  We would like to thank Suwido Limin and his team from the Centre for International Co-operation in Management of Tropical Peatland (CIMTROP) in Palangka Raya for the logistic support during the field inventory  ... 
doi:10.3390/rs3091957 fatcat:jzdt6pwxbzaunehr7xjt36spcq

Laser pulse bidirectional reflectance from CALIPSO mission

Xiaomei Lu, Yongxiang Hu, Yuekui Yang, Mark Vaughan, Zhaoyan Liu, Sharon Rodier, William Hunt, Kathy Powell, Patricia Lucker, Charles Trepte
2018 Atmospheric Measurement Techniques  
In addition to the surface bidirectional reflectance, the column top-of-atmosphere bidirectional reflectances are calculated from the CALIOP lidar background data and compared with the bidirectional reflectances  ...  The retrieved snow surface bidirectional reflectance is compared with reflectance from both CALIOP cloud-covered regions and MODIS BRDF–albedo model parameters.  ...  We would like to thank two anonymous reviewers and editor for their substantial comments and suggestions that led to the improvement of this paper.  ... 
doi:10.5194/amt-11-3281-2018 pmid:33868503 pmcid:PMC8051134 fatcat:ijoishbgkrhyhgb3s5tszer5zy

Laser pulse bidirectional reflectance from CALIPSO mission

Xiaomei Lu, Yongxiang Hu, Yuekui Yang, Mark Vaughan, Zhaoyan Liu, Sharon Rodier, William Hunt, Kathy Powell, Patricia Lucker, Charles Trepte
2018 Atmospheric Measurement Techniques Discussions  
In addition to the surface bidirectional reflectance, the column top-of-atmosphere bidirectional reflectances are calculated from the CALIOP lidar background data and compared with the bidirectional reflectances  ...  The retrieved snow surface bidirectional reflectance is compared with reflectance from both CALIOP cloud cover regions and MODIS BRDF/Albedo model parameters.  ...  the use of apparent surface reflectance in cloud 15 detection/screening in satellite data analysis.  ... 
doi:10.5194/amt-2017-488 fatcat:umd7fmk3znddlm7eear4f4hqbi

Amazon forests maintain consistent canopy structure and greenness during the dry season

Douglas C. Morton, Jyoteshwar Nagol, Claudia C. Carabajal, Jacqueline Rosette, Michael Palace, Bruce D. Cook, Eric F. Vermote, David J. Harding, Peter R. J. North
2014 Nature  
Asner for providing Amazon leaf reflectance data.  ...  Acknowledgements Funding for this research was provided by NASA, the NASA Postdoctoral Program and the NERC National Centre for Earth Observation. We thank G. P.  ...  GLAS data parameters were used to screen lidar footprints with cloud contamination, weak or saturated energies, or specular reflections from water.  ... 
doi:10.1038/nature13006 pmid:24499816 fatcat:2yon7nugk5dp5egjavqdr5ilda

Height changes over subglacial Lake Vostok, East Antarctica: Insights from GNSS observations

Andreas Richter, Sergey V. Popov, Mathias Fritsche, Valery V. Lukin, Alexey Yu. Matveev, Alexey A. Ekaykin, Vladimir Ya. Lipenkov, Denis V. Fedorov, Lutz Eberlein, Ludwig Schröder, Heiko Ewert, Martin Horwath (+1 others)
2014 Journal of Geophysical Research - Earth Surface  
ICESat laser altimetry data confirm that the amplitude of the surface deformations over the lake is restricted to a few centimeters.  ...  Height changes of the ice surface above subglacial Lake Vostok, East Antarctica, reflect the integral effect of different processes within the subglacial environment and the ice sheet.  ...  Acknowledgments We thank the staff at Vostok station and the participants of the convoys during the 47th, 48th, 52nd, 53rd, 55th, 56th, 57th, and 58th Russian Antarctic Expedition for their valuable support  ... 
doi:10.1002/2014jf003228 fatcat:emnqeu2elba57ajvuixwcdjqyu

Validation of satellite altimetry by kinematic GNSS in central East Antarctica

Ludwig Schröder, Andreas Richter, Denis V. Fedorov, Lutz Eberlein, Evgeny V. Brovkov, Sergey V. Popov, Christoph Knöfel, Martin Horwath, Reinhard Dietrich, Alexey Y. Matveev, Mirko Scheinert, Valery Lukin
2017 The Cryosphere Discussions  
stability of the ice-surface elevation above the lake.  ...  A crossover adjustment above subglacial Lake Vostok combining ICESat elevation data with our GNSS profiles yields a new set of ICESat laser campaign biases and provides new, independent evidence for the  ...  We also thank the participants of the Russian Antarctic Expedition, especially the convoy teams, for their valuable support.  ... 
doi:10.5194/tc-2016-282 fatcat:zyvlmdsztfgpnont4nyzb56dpy

The New Landsat Collection-2 Digital Elevation Model

Shannon Franks, James Storey, Rajagopalan Rengarajan
2020 Remote Sensing  
This new DEM will be used to process all of the scenes from Landsat 1-8 in Collection-2 processing and will be made available to the public by the end of 2020.  ...  The new DEM will be available world-wide with few exceptions.  ...  Ice, Cloud, and Land Elevation Satellite (ICESat) Data ICESat is the benchmark NASA Earth Observing System (EOS) mission for measuring ice sheet mass balance, cloud and aerosol heights, land topography  ... 
doi:10.3390/rs12233909 fatcat:rdh6hedgfvauvnrn37z2q4rmya

Validation of satellite altimetry by kinematic GNSS in central East Antarctica

Ludwig Schröder, Andreas Richter, Denis V. Fedorov, Lutz Eberlein, Evgeny V. Brovkov, Sergey V. Popov, Christoph Knöfel, Martin Horwath, Reinhard Dietrich, Alexey Y. Matveev, Mirko Scheinert, Valery V. Lukin
2017 The Cryosphere  
A crossover adjustment in the region of subglacial Lake Vostok combining ICESat elevation data with our GNSS profiles yields a new set of ICESat laser campaign biases and provides new, independent evidence  ...  for the stability of the ice-surface elevation above the lake.  ...  We also thank the participants of the Russian Antarctic Expedition, especially the convoy teams, for their valuable support.  ... 
doi:10.5194/tc-11-1111-2017 fatcat:zmgir5tlnjan7ccd3uiy77vmia

Influence of Atmospheric Scattering on the Accuracy of Laser Altimetry of the GF-7 Satellite and Corrections

Jiaqi Yao, Xinming Tang, Guoyuan Li, Jiyi Chen, Zhiqiang Zuo, Bo Ai, Shuaitai Zhang, Jinquan Guo
2021 Remote Sensing  
Satellite laser altimetry can obtain sub-meter or even centimeter-scale surface elevation data over large areas, but it is inevitably affected by scattering caused by clouds, aerosols, and other atmospheric  ...  the laser multiple scattering of the GaoFen-7 (GF-7) satellite.  ...  Assessment of Cloud Screening With Apparent Surface Reflectance in Support of the ICESat-2 Mission. IEEE Trans. Geosci. Remote Sens. 2013, 51, 1037–1045. [CrossRef] 27.  ... 
doi:10.3390/rs14010129 fatcat:v56d7mexqreankixncd4ebesje

Light-driven growth in Amazon evergreen forests explained by seasonal variations of vertical canopy structure

Hao Tang, Ralph Dubayah
2017 Proceedings of the National Academy of Sciences of the United States of America  
The ICESat-GLAS data are archived at https://nsidc.org. Funding for this research was provided by NASA Global Ecosystem Dynamics Investigation mission (Grant NNL15AA03C).  ...  Los for technical help with raw ICESat-GLAS data processing; and M.  ...  assess the surface roughness of Shuttle Radar Topography Mission (SRTM) data (40) .  ... 
doi:10.1073/pnas.1616943114 pmid:28223505 pmcid:PMC5347545 fatcat:wzguhbmnznhihgo3t33xbzg4xa

Long-term contributions of Baffin and Bylot Island Glaciers to sea level rise: an integrated approach using airborne and satellite laser altimetry, stereoscopic imagery and satellite gravimetry

A. S. Gardner, G. Moholdt, A. Arendt, B. Wouters
2012 The Cryosphere Discussions  
The doubling of the rate of mass loss is attributed to higher temperatures in summer with little change in annual precipitation.  ...  m 2 a −1 ) in 2003-2011.  ...  Despite the large absolute errors, the relative accuracy of the SPOT DEMs is very good with standard deviations (σ) in the range 2-5 m over icefree ground and 1-14 m over glacier surfaces with respect  ... 
doi:10.5194/tcd-6-1563-2012 fatcat:7pyrjdxmwvenzkhmvs5pry4mem

Improved retrieval of land ice topography from CryoSat-­2 data and its impact for volume change estimation of the Greenland Ice Sheet

Johan Nilsson, Alex Gardner, Louise Sandberg Sørensen, Rene Forsberg
2016 The Cryosphere Discussions  
These results indicate that the new methodology provides improved tracking of the snow/ice surface with lower sensitivity to changes in near-surface dielectric properties.  ...  In the interior part of the ice sheet, where CryoSat-2 operates in Low Resolution Mode, we find an improvement in the RMSE of 68 % and 55 % in the derived elevation and elevation changes, respectively.  ...  Furthermore, we thank Frank Paul at the University of Zurich for providing us with polygon outlines of the Greenland Ice Sheet, and the European Space Agency for providing their CryoSat-2 L1b product.  ... 
doi:10.5194/tc-2016-109 fatcat:yxj2qq5r65h2ldckwmtszr3ywu

Improved retrieval of land ice topography from CryoSat-2 data and its impact for volume-change estimation of the Greenland Ice Sheet

Johan Nilsson, Alex Gardner, Louise Sandberg Sørensen, Rene Forsberg
2016 The Cryosphere  
These results indicate that the new methodology provides improved tracking of the snow/ice surface with lower sensitivity to changes in near-surface dielectric properties.  ...  In the interior part of the ice sheet, where CryoSat-2 operates in low-resolution mode (LRM), we find an improvement in the RMSE of 68 and 55<span class="thinspace"></span>% in the derived elevation and  ...  Furthermore, we thank Frank Paul at the University of Zurich for providing us with polygon outlines of the Greenland Ice Sheet, and the European Space Agency for providing their CryoSat-2 L1b product.  ... 
doi:10.5194/tc-10-2953-2016 fatcat:zic5ubkmdfeddbburnqsa6vecy

Laser Diode Pump Technology for Space Applications [chapter]

Elisavet Troupaki, Mark A., Aleksey A., Anthony W.
2012 Semiconductor Laser Diode Technology and Applications  
Indeed, ICESat-2, the follow-on mission to ICESat, slated to be launched in 2016, is baselining the micropulse altimetry approach.  ...  The laser must support the instrument requirement of a range resolution of less than 40 cm to the surface of the planet.  ...  Publisher InTech Published online 25, April, 2012 Published in print edition April This book represents a unique collection of the latest developments in the rapidly developing world of semiconductor  ... 
doi:10.5772/36602 fatcat:7idbqqwrkjdylpebumoineqpbu
« Previous Showing results 1 — 15 out of 65 results