Filters








1,615 Hits in 5.4 sec

Page 1652 of Hydrological Processes Vol. 14, Issue 9 [page]

2000 Hydrological Processes  
The potential of mapping wet snow- covered areas in mountain and glacier environments using satellite and airborne SAR was also demonstrated (Brugman et a/., 1996; Maxfield 1996).  ...  In particular, it was shown that the computed temporal variation of wet snow area for mountain tallus slopes was similar to that for snow ablation measured at a base weather station, and that SAR imagery  ... 

MONITORING OF GLACIAL CHANGE IN THE HEAD OF THE YANGTZE RIVER FROM 1997 TO 2007 USING INSAR TECHNIQUE

H. Wu, Y. Zhang, J. Zhang, Z. Lu, W. Zhong
2012 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
Conventional method for glacial monitoring is optical remote sensing. However, affected by cloud and snow cover, it is hard to monitor glacier by optical images.  ...  With this proposed method, two ERS-2 SAR single look complex (SLC) images acquired in 1997 and two ENVISAT ASAR SLC images acquired in 2007 are used to extract glacial area in 1997 and 2007 over Geladandong  ...  However, because of cloud cover and snow cover effects, multi-spectral data is often difficult to accurately monitor glacier changes.  ... 
doi:10.5194/isprsarchives-xxxix-b7-411-2012 fatcat:grgc74wq6rbftcqjopqck4powa

Remote Sensing of Mountain Glaciers and Related Hazards [chapter]

Pratima Pandey, Alagappan Ramanathan, Gopalan Venkataraman
2016 Environmental Applications of Remote Sensing  
But most importantly, glaciers have aroused a lot of concern in terms of glacier area changes, thickness change, mass balance and their consequences on water resources as well as related hazards.  ...  Mountain glaciers are highly sensitive to temperature and precipitation fluctuations and active geomorphic agents in shaping the landforms of glaciated regions which are direct imprints of past glaciations  ...  Optical remote sensing data is more suitable for snow cover mapping, glacier area and snout monitoring.  ... 
doi:10.5772/61917 fatcat:32cpqk7scncqjdoczohmgfaoym

Special Section Guest Editorial: Progress in Snow Remote Sensing

Hongjie Xie, Chunlin Huang, Tiangang Liang
2014 Journal of Applied Remote Sensing  
Contribution of snowmelt to runoff is one of the important water resources in mountainous regions, in addition to rainfall and glacier melt.  ...  for snow cover and glacier mapping (6 papers ), snow cover and snow melt-runoff modeling (3 papers), and one review paper.  ...  Zhu et al. present a support vector machine-based decision tree algorithm to extract snow cover of mountainous areas from high resolution optical imagery (ZY-3 satellite, China).  ... 
doi:10.1117/1.jrs.8.084601 fatcat:i7zahwpduffqhid2musrrvzjou

SNOW COVER MAPPING AND ICE AVALANCHE MONITORING FROM THE SATELLITE DATA OF THE SENTINELS

S. Wang, B. Yang, Y. Zhou, F. Wang, R. Zhang, Q. Zhao
2018 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
In order to monitor ice avalanches efficiently under disaster emergency conditions, a snow cover mapping method based on the satellite data of the Sentinels is proposed, in which the coherence and backscattering  ...  The method can make full use of the acquired SAR image and multispectral image under emergency conditions, and the application potential of Sentinel data in the field of snow cover mapping is exploited  ...  Based on the high reflectance of snow in some wavelengths compared with other natural targets, optical and near-infrared sensors can distinguish between snow-covered and snow-free ground (Warren, 1982  ... 
doi:10.5194/isprs-archives-xlii-3-1765-2018 fatcat:syeh2q2ymrerrpazqh7peuhxru

Remote Sensing of Snow Cover Using Spaceborne SAR: A Review

Ya-Lun S. Tsai, Andreas Dietz, Natascha Oppelt, Claudia Kuenzer
2019 Remote Sensing  
In addition to widely applied backscattering-based method, thanks to the advancements of spaceborne SAR sensors and image processing techniques, many new approaches based on interferometric SAR (InSAR)  ...  and polarimetric SAR (PolSAR) have been developed since the launch of ERS-1 in 1991 to monitor snow cover under both dry and wet snow conditions.  ...  The method was tested in five mountainous study areas around the globe and the accuracy above 0.75 is confirmed in all regions by validation with optical-based SCE product.  ... 
doi:10.3390/rs11121456 fatcat:yo5qexaq45fcnj2o6ujh4aezje

Wet and Dry Snow Detection Using Sentinel-1 SAR Data for Mountainous Areas with a Machine Learning Technique

Tsai, Dietz, Oppelt, Kuenzer
2019 Remote Sensing  
Traditional studies on mapping wet snow cover extent (SCE) often feature limitations, especially in vegetated and mountainous areas.  ...  The aim of this study is to propose a new total and wet SCE mapping strategy based on freely accessible spaceborne synthetic aperture radar (SAR) data.  ...  It complements the internal validation illustrated in Section 4.1, with addition to external validation based on the GSP, optical-based SCE, and in-situ snow depth data, as illustrated in the data splitting  ... 
doi:10.3390/rs11080895 fatcat:eon7s5w565hdnpruonrq2cauvu

Discussion and Conclusions [chapter]

Reinhart A. Gygi
2011 Quantitative Geology of Late Jurassic Epicontinental Sediments in the Jura Mountains of Switzerland  
to determine the capabilities for snow parameter estimation in mountainous areas.  ...  The backscatter statistics of EMISAR C-band data from two areas partly covered with wet snow was studied.  ...  The aerial photo was co-registered with Area 3 EMISAR data using a second-degree control-point transformation. An accurate snow cover mask was extracted from the aerial image based on thresholding.  ... 
doi:10.1007/978-3-0348-0136-2_11 fatcat:o3gi6m3a2zewjfz54ylo2qj3km

Geo-Hazard Detection and Monitoring Using SAR and Optical Images in a Snow-Covered Area: The Menyuan (China) Test Site

Qihuan Huang, Yian Wang, Jia Xu, Angelique Nishyirimbere, Zhimin Li
2017 ISPRS International Journal of Geo-Information  
In this work, we combine SAR and optical images for geo-hazard detection and monitoring in Western China.  ...  areas were confirmed with Chinese Gaofen-1 optical satellite images.  ...  Author Contributions: Qihuan Huang and Jia Xu conceived and designed the study; SAR data was processed by Qihuan Huang and Yian Wang; Jia Xu and Zhimin Li provided and processed the optical image; Qihuan  ... 
doi:10.3390/ijgi6100293 fatcat:v7jzcunhebfatc6t33naswew4a

Assessing the Glacier Boundaries in the Qinghai-Tibetan Plateau of China by Multi-Temporal Coherence Estimation with Sentinel-1A InSAR

Yueling Shi, Guoxiang Liu, Xiaowen Wang, Qiao Liu, Rui Zhang, Hongguo Jia
2019 Remote Sensing  
Based on the spatiotemporal analysis of coherence values in the selected sampling areas, we first determined the threshold as 0.7 for distinguishing among different ground targets and then extracted the  ...  The DaDongkemadi Glacier (DDG) in the central QTP was selected as the study area with land cover mainly classified into wet snow, ice, river outwash and soil land.  ...  Acknowledgments: The Sentinel-1A TOPS IW SLC SAR images, the POD data and the Sentinel-2B MSI L1C images were provided by the Copernicus Sentinel-1 Mission of ESA.  ... 
doi:10.3390/rs11040392 fatcat:vkulgceg7jgepcchm3itvlsd34

Accurate Determination of Glacier Surface Velocity Fields with a DEM-Assisted Pixel-Tracking Technique from SAR Imagery

Shiyong Yan, Guang Liu, Yunjia Wang, Zhixing Ruan
2015 Remote Sensing  
The maximum velocity, 0.85 m•d −1 , was observed in the middle part on the Fedchenko Glacier, which is the world's longest mountain glacier.  ...  The motion fluctuation on its main trunk is apparently influenced by mass flowing in from tributaries, as well as angles between tributaries and the main stream.  ...  It is helpful to outline the glaciers always covered by the snow, which cannot be easily distinguished from the surrounding snow-covered mountains, especially in optical remote sensing data.  ... 
doi:10.3390/rs70810898 fatcat:yw6yr245sbdxtasnlehmejhswi

Discussion and Conclusions [chapter]

Christopher Pollitt
2012 New Perspectives on Public Services  
to determine the capabilities for snow parameter estimation in mountainous areas.  ...  The backscatter statistics of EMISAR C-band data from two areas partly covered with wet snow was studied.  ...  The aerial photo was co-registered with Area 3 EMISAR data using a second-degree control-point transformation. An accurate snow cover mask was extracted from the aerial image based on thresholding.  ... 
doi:10.1093/acprof:osobl/9780199603831.003.0009 fatcat:edn3wlvikjffzpgy246zbsozqa

Discussion and Conclusions [chapter]

Maria Teresa Riviello, Anna Esposito
2016 On the Perception of Dynamic Emotional Expressions: A Cross-cultural Comparison  
to determine the capabilities for snow parameter estimation in mountainous areas.  ...  The backscatter statistics of EMISAR C-band data from two areas partly covered with wet snow was studied.  ...  The aerial photo was co-registered with Area 3 EMISAR data using a second-degree control-point transformation. An accurate snow cover mask was extracted from the aerial image based on thresholding.  ... 
doi:10.1007/978-94-024-0887-4_9 fatcat:nnt7cl3serezjnye6dgvl2owpu

Discussion and Conclusions [chapter]

Thomas Baron
2016 The Impact of Diaspora Ventures on the Dynamics of the Start-up Ecosystem Berlin  
to determine the capabilities for snow parameter estimation in mountainous areas.  ...  The backscatter statistics of EMISAR C-band data from two areas partly covered with wet snow was studied.  ...  The aerial photo was co-registered with Area 3 EMISAR data using a second-degree control-point transformation. An accurate snow cover mask was extracted from the aerial image based on thresholding.  ... 
doi:10.1007/978-3-658-16325-9_5 fatcat:4zuy5bh37zfythcasgv3bofh2y

Discussion and Conclusions [chapter]

Yi Du
2016 The Use of First and Second Language in Chinese University EFL Classrooms  
to determine the capabilities for snow parameter estimation in mountainous areas.  ...  The backscatter statistics of EMISAR C-band data from two areas partly covered with wet snow was studied.  ...  The aerial photo was co-registered with Area 3 EMISAR data using a second-degree control-point transformation. An accurate snow cover mask was extracted from the aerial image based on thresholding.  ... 
doi:10.1007/978-981-10-1911-1_8 fatcat:x3qafod6tjhx5b673dxvecqur4
« Previous Showing results 1 — 15 out of 1,615 results