Results 41 to 50 of about 1,652,719 (226)

Impact of SRTM and ASTER Terrain Models on Geoid Determination: A Case Study in the High‐Mountainous Region

open access: yesEarth and Space Science, Volume 12, Issue 10, October 2025.
Abstract An accurate geoid has important consequences for many fields such as engineering applications, underground resource exploration, geophysical surveys, etc. Its precise determination relies on two key data sets: gravity measurements and high‐resolution elevation data, both of which are critical for achieving reliable results.
Leyla Cakir
wiley   +1 more source

Terrain Factors Induced Slope Instability in CNG 37 – Ghat section, Panthalur, The Nilgiris [PDF]

open access: yesE3S Web of Conferences
— Landslides are short-lived phenomena but can cause extraordinary changes in the landscape, destroying life and property. Mitigation and management of natural disasters are important issues.
Mani S.   +2 more
doaj   +1 more source

Glacier Variations at Xinqingfeng and Malan Ice Caps in the Inner Tibetan Plateau Since 1970

open access: yesRemote Sensing, 2020
The inner Tibetan Plateau is a glacierized region where glaciers show heterogeneous change. The Xinqingfeng and Malan ice caps are located in this region, and a transition zone exists with shifting influences between the westerlies and Indian summer ...
Zhen Zhang   +9 more
doaj   +1 more source

Applications of GIS in Flood Control and Crises Management Using Different Sources of DEMs in Al Arish, Sinai, Egypt [PDF]

open access: yesPort Said Engineering Research Journal, 2016
The aim of this research is to provide an approach to identify the potential routes of water flood in the study area as well as its relevant area of containment (Al Arish, North Sinai, Egypt).
Ahmed Amin   +4 more
doaj   +1 more source

Using LiDAR‐Based DEM Elevation Difference Calculations to Estimate Net Streambank Erosion in an Iowa River, USA

open access: yesRiver Research and Applications, Volume 41, Issue 7, Page 1418-1426, September 2025.
ABSTRACT Streambank erosion is an important source of sediment to river systems but is difficult to quantify at watershed scales. In this study, high‐resolution Light Detection and Ranging (LiDAR) measurements collected from 2009 and 2020 were used to quantify the difference in land surface elevation that occurred along the fourth and fifth‐order ...
Calvin F. Wolter   +3 more
wiley   +1 more source

Spatial and Temporal Characteristics of Extreme Hourly Precipitation in Sichuan Province Based on Spatially Dense Rainfall Observation

open access: yesGaoyuan qixiang
Based on the hourly precipitation data of 3454 stations with dense space in Sichuan Province and DEM (Digital Elevation Model) data with horizontal accuracy of 30 m, the temporal and spatial distribution characteristics of extreme hourly precipitation in
Qiuxue ZHOU, Lan KANG
doaj   +1 more source

The approach for combining dem acquisitions for the TanDEM-X dem mosaic [PDF]

open access: yes2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013
For the global TanDEM-X DEM the whole world will be acquired by at least two coverages. Thereby on the one hand phase unwrapping errors are reduced by applying the dual-baseline method and on the other hand a low noise level is ensured even for difficult areas like forests and steep terrain.
Gruber, Astrid   +4 more
openaire   +2 more sources

A Discrete Element Method–Based Energetic Approach to Model Two‐Dimensional Fatigue Crack Propagation

open access: yesInternational Journal for Numerical and Analytical Methods in Geomechanics, Volume 49, Issue 5, Page 1420-1436, 10 April 2025.
ABSTRACT In this work, a fatigue crack propagation model is proposed using the two‐dimensional discrete element method (DEM). The challenge lies in describing the small progressive fatigue crack growth within a single cycle, which is typically much smaller than the size of the smallest particles, making it difficult to continuously capture the loss of ...
Lei Ma   +3 more
wiley   +1 more source

Democracy Doesn’t Always Happen Over Night: Regime Change in Stages and Economic Growth [PDF]

open access: yes, 2021
We motivate and empirically analyse the idea that democratic regime change is not a dis-crete event but a two-stage process: in the first stage, autocracies enter into an ‘episode’ of political liberalization which can last for years or even decades; in ...
Eberhardt, Markus, Boese, Vanessa
core   +2 more sources

Individual Tree Position Extraction and Structural Parameter Retrieval Based on Airborne LiDAR Data: Performance Evaluation and Comparison of Four Algorithms

open access: yesRemote Sensing, 2020
Information for individual trees (e.g., position, treetop, height, crown width, and crown edge) is beneficial for forest monitoring and management.
Wei Chen, Haibing Xiang, Kazuyuki Moriya
doaj   +1 more source

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