272 Hits in 5.0 sec

L-Band InSAR Penetration Depth Experiment, North Slope Alaska

Reginald R. Muskett
2017 Journal of Geoscience and Environment Protection  
Knowledge of the L-band penetration depth on lowland Arctic tundra is necessary to constrain analysis of carbon mass balance and hazardous conditions arising from permafrost degradation and thaw, surface  ...  This is the focus of our new research project: to test the penetration depth of L-band SAR/InSAR by aircraft and spacecraft systems at a test site in Arctic Alaska using multi-frequency analysis and progressive  ...  We thank the State of Alaska, the National Geospatial-Intelligence Agency DOD, the National Science Foundation and the US Department of Interior. We thank Vladimir E.  ... 
doi:10.4236/gep.2017.53002 fatcat:w3me2gvm3zeizb3okhvimyl22y

Satellite Remote Sensing of Permafrost and Seasonally Frozen Ground [chapter]

Claude R. Duguay, Tingjun Zhang, David W. Leverington, Vladimir E. Romanovsky
2013 Remote Sensing in Northern Hydrology: Measuring Environmental Change  
used in conjunction with older aerial photographs to identify changes that have occurred in permafrost terrain in recent decades.  ...  Permafrost may vary in thickness from a few centimeters to several hundred meters.  ...  The authors wish to thank Jan Mydynski for her valuable editorial assistance.  ... 
doi:10.1029/163gm06 fatcat:db2pjkge4bdxlpk3tfou4mytza

Active-layer thickness estimation from X-band SAR backscatter intensity

Barbara Widhalm, Annett Bartsch, Marina Leibman, Artem Khomutov
2017 The Cryosphere  
>10<span class="thinspace"></span>m window) in order to examine the possibility of delineating ALT with continuous and larger spatial coverage in this area and compare it to the already-established method  ...  An increase of ALT with increasing backscatter can be determined.  ...  This work was supported by the Austrian Science Fund under grant [I 1401] and the Russian Foundation for Basic Research grant 13-05-91001-ANF-a (joint Russian-Austrian project COLD-Yamal).  ... 
doi:10.5194/tc-11-483-2017 fatcat:sg6kcc67gbdcljybuvhdshafle

Active Layer Thickness Estimation from X-Band SAR Backscatter Intensity

Barbara Widhalm, Annett Bartsch, Marina Leibman, Artem Khomutov
2016 The Cryosphere Discussions  
The relationship between ALT and X-Band SAR backscatter of TerraSAR-X has been investigated in order to explore the possibility of delineating ALT on a continuous and larger spatial coverage in this area  ...  The RMSE over a comparably heterogeneous validation site with maximum ALT of >&amp;thinsp;150&amp;thinsp;cm is in the range of 20&amp;ndash;22&amp;thinsp;cm.  ...  This work was supported by the Austrian Science Fund under grant [I 1401] and the Russian Foundation for Basic Research grant 13-05-91001-ANF-a (joint Russian-Austrian project COLD-Yamal).  ... 
doi:10.5194/tc-2016-177 fatcat:cgqdyrmi3raajc7kl6b7kzjvna

Characterizing Post-Drainage Succession in Thermokarst Lake Basins on the Seward Peninsula, Alaska with TerraSAR-X Backscatter and Landsat-based NDVI Data

Prajna Regmi, Guido Grosse, Miriam Jones, Benjamin Jones, Katey Anthony
2012 Remote Sensing  
We attribute the decreasing trend of backscatter and NDVI with increasing basin age to post-drainage changes in the basin surface.  ...  drained thermokarst lake basins of various age in the ice-rich permafrost region of the northern Seward Peninsula, Alaska.  ...  Acknowledgements We acknowledge support from NASA Carbon Cycle Sciences grant NNX08AJ37G, NSF grant OPP-0732735, and the Western Alaska LCC.  ... 
doi:10.3390/rs4123741 fatcat:yclilrmrhvg65hwks2udos5qb4

Applying Machine Learning and Time-Series Analysis on Sentinel-1A SAR/InSAR for Characterizing Arctic Tundra Hydro-Ecological Conditions

Michael Allan Merchant, Mayah Obadia, Brian Brisco, Ben DeVries, Aaron Berg
2022 Remote Sensing  
Combining time-series SAR/InSAR data with terrain derivatives resulted in the highest per-class F1 score values, ranging from 0.682 to 0.955.  ...  The intensity measured by a polarimetric SAR has proven effective for characterizing Arctic tundra landscapes due to the unique backscattering signatures associated with different cover types.  ...  Acknowledgments: We would like to thank the NSERC and the GWF, along with Ducks Unlimited Canada (DUC) for providing spatially referenced field photographs collected within the study area.  ... 
doi:10.3390/rs14051123 fatcat:slbsg7grbvcb3d4nrtox6nvjaa

Analysis of the Temporal Evolution of Ice Aprons in the Mont-Blanc Massif Using X and C-Band SAR Images

Suvrat Kaushik, Bastien Cerino, Emmanuel Trouve, Fatima Karbou, Yajing Yan, Ludovic Ravanel, Florence Magnin
2022 Frontiers in Remote Sensing  
The analysis of the temporal variations of the backscatter coefficient illustrates the effects of increasing temperatures on the surface of the IAs.  ...  Higher mean backscatter values in the X-band than in the C-band indicate surface scattering phenomena dominate the IAs.  ...  ACKNOWLEDGMENTS The authors thank the Spanish Instituto Nacional de Tecnica Aerospacial (INTA) for the PAZ images (Project AO-001-051).  ... 
doi:10.3389/frsen.2022.930021 fatcat:thnb3466pzbw5ad6wsytmuf22a

Detection of open water dynamics with ENVISAT ASAR in support of land surface modelling at high latitudes

A. Bartsch, A. M. Trofaier, G. Hayman, D. Sabel, S. Schlaffer, D. B. Clark, E. Blyth
2012 Biogeosciences  
Statistical measures of the backscatter distribution were applied in order to retrieve suitable classification data.  ...  </strong> Wetlands are generally accepted as being the largest but least well quantified single source of methane (CH<sub>4</sub>).  ...  It is also part of the PERMAFROST project, which is funded by ESA's Data User Element (DUE) program as a component of the Earth Observation Envelope Program (EOEP) (ESRIN Contr.  ... 
doi:10.5194/bg-9-703-2012 fatcat:etuj3tc7fvezlbqu3cbfwnfs4e

Potential of C and X Band SAR for Shrub Growth Monitoring in Sub-Arctic Environments

Yannick Duguay, Monique Bernier, Esther Lévesque, Benoit Tremblay
2015 Remote Sensing  
with increasing volume scattering from the shrub branches.  ...  In order to develop better tools to assess and understand this phenomenon, the sensitivity of multi-polarized SAR backscattering at C and X band to shrub density and height is studied under various conditions  ...  Author Contributions Yannick Duguay: ground measurements of snow characteristics, image and in situ data analysis, results interpretation and redaction.  ... 
doi:10.3390/rs70709410 fatcat:6j326hiwszfbhcmzw7mmjatt6e

Shrinking thermokarst ponds and groundwater dynamics in discontinuous permafrost near council, Alaska

Kenji Yoshikawa, Larry D. Hinzman
2003 Permafrost and Periglacial Processes  
tundra terrain located in discontinuous permafrost near Council, Alaska.  ...  Shrinking pond surface areas may become a common feature in the discontinuous permafrost regions as a consequence of warming climate and thawing permafrost.  ...  Howe for their efforts in data collection and analysis. We appreciate the constructive suggestions of two anonymous reviewers.  ... 
doi:10.1002/ppp.451 fatcat:d46hrq47rzgabafbqlwg2rviki

Can C-band synthetic aperture radar be used to estimate soil organic carbon storage in tundra?

Annett Bartsch, Barbara Widhalm, Peter Kuhry, Gustaf Hugelius, Juri Palmtag, Matthias Benjamin Siewert
2016 Biogeosciences  
SOC values are directly determined from backscatter values instead of upscaling using land cover or soil classes. The multi-mode capability of SAR allows application across scales.  ...  Global Monitoring-mode-derived SOC increases with unfrozen period length. This indicates the importance of this parameter for modelling of the spatial distribution of soil organic carbon storage.</p>  ...  Financial support by the European Commission (FP7-ENV-2011, grant agreement no. 282700) through the project Changing Permafrost in the Arctic and its Global Effects in the 21st Century (PAGE21) is gratefully  ... 
doi:10.5194/bg-13-5453-2016 fatcat:l7omj6jxm5bgtknervypnfj434

Assessing spatial and temporal variations in surface soil moisture in fire-disturbed black spruce forests in Interior Alaska using spaceborne synthetic aperture radar imagery — Implications for post-fire tree recruitment

Eric S. Kasischke, Laura L. Bourgeau-Chavez, Jill F. Johnstone
2007 Remote Sensing of Environment  
The differences in soil moisture between the sites were related to landscape-scale variations in soil drainage and seasonal permafrost thawing.  ...  The results of this study showed distinct seasonal and longer-term trends in soil moisture in the two sites, with the site that burned in 1994 having higher soil moisture than the site that burned in 1999  ...  Acknowledgements The research for this grant was supported by NASA (grant number NAG5-10097), with support for field observations in 2005 provided by the Bonanza Creek LTER program (USFS grant no.  ... 
doi:10.1016/j.rse.2006.10.020 fatcat:dpiihgqai5e2pbnjzdcjvnya2e

Multisensor Microwave Sensitivity to Freeze/Thaw Dynamics Across a Complex Boreal Landscape

Erika Podest, Kyle C. McDonald, John S. Kimball
2014 IEEE Transactions on Geoscience and Remote Sensing  
Results show that L-, C-, and Ku-band backscatter are sensitive to landscape FT state transitions, with higher backscatter for nonfrozen than frozen conditions at Cand L-bands but the opposite response  ...  In this paper, we perform a landscape analysis of multifrequency and multitemporal satellite microwave remote sensing measurements at L-band (JERS-1), C-band (ERS), and Ku-band (QuikSCAT) for characterizing  ...  A recent boreal FT classification analysis using 25-km Ku-band radar backscatter data from QuikSCAT indicated substantial spatial and temporal variations in the satellite FT signal in relation to individual  ... 
doi:10.1109/tgrs.2014.2303635 fatcat:xvi3uys4mvco5exkgxmszrjnbm

ICESat GLAS Elevation Changes and ALOS PALSAR InSAR Line-of-Sight Changes on the Continuous Permafrost Zone of the North Slope, Alaska

Reginald R. Muskett
2015 International journal of geosciences  
Array type L-band Synthetic Aperture Radar (ALOS PALSAR) on the continuous permafrost zone of the North Slope, Alaska.  ...  and the JAXA Advanced Land Observing Satellite Phased Array type L-band Synthetic Aperture Radar.  ...  GMTSAR and the Generic Mapping Tools were used in this research.  ... 
doi:10.4236/ijg.2015.610086 fatcat:nouc2mglpnfx7jmdowtvurdq2q

Seasonal Progression of Ground Displacement Identified with Satellite Radar Interferometry and the Impact of Unusually Warm Conditions on Permafrost at the Yamal Peninsula in 2016

Annett Bartsch, Marina Leibman, Tazio Strozzi, Artem Khomutov, Barbara Widhalm, Elena Babkina, Damir Mullanurov, Ksenia Ermokhina, Christine Kroisleitner, Helena Bergstedt
2019 Remote Sensing  
X-band and C-band records agree well with each other, including seasonal evolution of subsidence.  ...  We analyze dense records of COSMO-Skymed from 2013 and 2016 and of Sentinel-1 from 2016, 2017, and 2018 for the unfrozen period over central Yamal (Russia).  ...  Results are partially based on modified Copernicus data from 2016 to 2018. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs11161865 fatcat:mwy7pe5f65ee7fzlttqysg7saq
« Previous Showing results 1 — 15 out of 272 results