Results 221 to 230 of about 582 (245)

Automated delineation of debris-covered glaciers based on ASTER data

2007
Large areas of the glacier tongues at Mt. Everest are heavily covered by supraglacial debris. This hampers the automated mapping of the actual ice snout by means of spaceborne imagery due to the similar spectral signal of the surrounding debris. The most significant features which differentiate the glaciers are the typical surface characteristics like ...
Bolch, Tobias, Buchroithner, Manfred F, Kunert, André, Kamp, Ulrich   +3 more
openaire   +1 more source

Dissolved organic matter sources in glacierized watersheds delineated through compositional and carbon isotopic modeling

Limnology and Oceanography, 2020
AbstractClimate change is decreasing watershed glacial coverage throughout Alaska, impacting the biogeochemistry of downstream ecosystems. We collected streamwater fortnightly over the glacial runoff period from three streams of varying watershed glacier coverage (0–49%) and a subglacial outflow to assess how glacier recession impacts the relative ...
Megan I. Behnke, Aron Stubbins, Jason B. Fellman, Eran Hood, Thorsten Dittmar, Robert G. M. Spencer   +5 more
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Evaluation of thermal regime and delineation of ablation processes for a temperate glacier ​

Temperate glaciers respond sensitively to climate warming, yet in situ observations of their thermal and hydrological regimes remain sparse and often discontinuous. This study integrates four years of field measurements with numerical modeling to investigate the water and heat dynamics of Baishui River Glacier No.
Xingguo Yan, Shijin Wang, Zhenqi Sun, Xinggang Ma   +3 more
openaire   +1 more source

Intra-annual environmental status and phytoplankton community delineation of a karst glacier lake, Gahar, Iran

Environmental Monitoring and Assessment
Phytoplankton is the main constituent of a healthy high mountain lake, and the turnover in its community composition is directly related to overall diversity and resilience. Concerning the pristine nature of Lake Gahar, this study aimed to assess phytoplankton stability using alpha diversity indices, Simpson dissimilarity index (βSIM), and long-term ...
Rezvan Mousavi-Nadushan, Monir Ghiyasabadi   +1 more
openaire   +2 more sources

A Hybrid CNN + Random Forest Approach to Delineate Debris Covered Glaciers Using Deep Features

Journal of the Indian Society of Remote Sensing, 2018
The main aim of this study is to propose a novel hybrid deep learning framework approach for accurate mapping of debris covered glaciers. The framework comprises of integration of several CNNs architecture, in which different combinations of Landsat 8 multispectral bands (including thermal band), topographic and texture parameters are passed as input ...
Rahul Nijhawan, Josodhir Das, Raman Balasubramanian   +2 more
openaire   +1 more source

Intercomparison of remotely sensed methods for delineation of high mountain debris-covered glaciers using machine learning

2023
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Racoviteanu, A., Miles, E., Davies, B., Bolch, T., Watson, S., Buri, P., Liu, Q., Mateo, E., Wilson, R., Robson, B., Schellenberger, T., Maslov, K., Persello, C., King, O.   +13 more
openaire   +2 more sources

Comparison of Support Vector Machine and Artificial Neural Network for Delineating Debris Covered Glacier

2016
Glacier mapping accuracy plays very important role in studies like mass balance of glacier, water resource management and in understanding the health of the glacier. Several of the present glaciers are covered with debris of different thickness. So it becomes difficult to distinguish debris covered glacier from the adjacent valley rock, alone with the ...
Rahul Nijhawan, Josodhir Das, Raman Balasubramanian   +2 more
openaire   +1 more source

Mapping the Margins: Evaluating Accuracy and Ambiguity in Automated Rock Glacier Delineation

Rock glaciers, the most visible surface expression of permafrost landforms, are found across glacial, periglacial and paraglacial environments. Accurate and consistent mapping of their extent is fundamental for advancing research in geomorphology, hydrology, ecology, geohazard assessment, permafrost dynamics, and climate studies.
Sunil Tamang, Shelley MacDonell, James Brasington, James Shulmeister, Benjamin Aubrey Robson   +4 more
openaire   +1 more source

How well do InSAR measurements align with rock glacier delineations in the Austrian Alps?

Rock glaciers, key indicators of permafrost dynamics and hydrological processes in alpine regions, are studied to understand their kinematics and responses to climate change. By analysing Earth observation (EO) data, it is possible to detect and delineate them, estimate rock glacier velocities including seasonal and multi-year velocity patterns, and ...
Elena Nafieva, Daniel Hölbling, Emma Hauglin, Zahra Dabiri, Benjamin Aubrey Robson, Vanessa Streifeneder, Lorena Abad   +6 more
openaire   +1 more source

Conditional Random Fields for Improving Deep Learning-Based Glacier Calving Front Delineations

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium, 2023
Nora Gourmelon, Julian Klink, Thorsten Seehaus, Matthias H. Braun, Andreas K. Maier, Vincent Christlein   +5 more
openaire   +1 more source