Preprints
There are 6240 Preprints listed.
Examining quality of DGNSS derived positioning in data in urban city- A case study of an urban city in India
Published: 2024-11-12
Subjects: Engineering
GNSS observations are carried out in static mode/ Differential global navigation satellite system (DGNSS) and dynamic mode / Real time Kinematics (RTK) mainly. RTK mode of observation is useful in case of navigation whereas in order to determine very precise positioning, static / DGNSS/ DGPS mode is recommended. In this study, we have examined the quality of DGNSS survey of an urban city in India [...]
Automatic detection of number of aircrafts over satellite data using deep learning
Published: 2024-11-12
Subjects: Engineering
: Instance segmentation is a novel technique to automatically detect and count the number of objects from satellite imagery for various applications using deep learning frameworks such as Mask-RCNN and YOLO. In this paper, we have implemented the YOLOv5 and YOLOv7 instance segmentation models on high-resolution satellite imagery (0.31m to 1.74m) of both panchromatic (16-bit PAN) and [...]
Contrasting impact of irrigation on farmworker heat stress in day and night in intensely irrigated agricultural lands of California
Published: 2024-11-11
Subjects: Physical Sciences and Mathematics
Farmworkers, the ‘frontline workers’ of our food system, are often exposed to heat stress that is likely to increase in frequency and severity due to climate change. Irrigation can exacerbate heat stress, quantification of which is crucial in intensely irrigated agricultural lands such as the Imperial Valley (IV) in southern California. We present high-resolution maps of wet bulb globe [...]
Sensing the dynamic nature of fragmented croplands in India through earth observation: a comprehensive review
Published: 2024-11-09
Subjects: Agriculture, Earth Sciences, Environmental Sciences, Food Science, Geography, Nature and Society Relations, Physical and Environmental Geography, Remote Sensing, Spatial Science
Fragmentation or the breakdown of landholdings to smaller parcels has an adverse impact on crop yields and productivity because of its uneconomic operational sizes. This comprehensive review reflects the insights into the complex dynamics of small landholding (SLs) in India by leveraging earth observation (EO) based sensing technology through synthesizing existing literature, methodologies and [...]
Dictionary Learning with Convolutional Structure for Seismic Data Denoising and Interpolation
Published: 2024-11-09
Subjects: Earth Sciences, Electrical and Computer Engineering, Engineering, Geophysics and Seismology, Physical Sciences and Mathematics, Signal Processing
Seismic data inevitably suffers from random noise and missing traces in field acquisition. This limits the utilization of seismic data for subsequent imaging or inversion applications. Recently, dictionary learning has gained remarkable success in seismic data denoising and interpolation. Variants of the patch-based learning technique, such as the K-SVD algorithm, have been shown to improve [...]
Pycnocline Stratification Shapes Submesoscale Vertical Tracer Transport
Published: 2024-11-08
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Pycnocline stratification is increasing across multiple ocean basins due to a warming surface ocean and increasing sea ice melt. Pycnocline stratification plays a leading order role in tracer transport, shaping capacity for heat and carbon uptake, making it a key parameter of interest on timescales ranging from paleoclimate to plankton blooms. Part of the challenge in assessing the role of [...]
Micro-CT Characterization of the Chang’e 5 Lunar Regolith Samples
Published: 2024-11-08
Subjects: Physical Sciences and Mathematics
Chang’e-5 (CE-5) lunar regolith samples were scanned using X-ray micro-computed tomography (micro-CT), and over 0.7 million particles were extracted from the images through machine learning-based segmentation. This is the largest three-dimensional (3D) image dataset on lunar regolith particles to date, offering a unique opportunity to study the key characteristics of lunar regolith. The image [...]
Clinopyroxene archives of magma redox in ocean island basalts: insights from thermodynamic modelling
Published: 2024-11-07
Subjects: Earth Sciences
Determination of Water Quality Beside the Industrial Area of Turag River in Dhaka, Bangladesh.
Published: 2024-11-07
Subjects: Civil and Environmental Engineering, Engineering, Environmental Engineering
The study deals with assessing water quality parameters including pH, total dissolved solids (TDS), dissolved oxygen (DO), biological oxygen demand (BOD), chemical oxygen demand (COD), temperature, transparency, and turbidity of the Turag River in Gazipur, Bangladesh based on the standards of the Department of Environment (DoE) in Bangladesh and the Environmental Quantity Standard (EQS). The [...]
Regional screening of saline aquifers in the Malay Basin for CO2 storage
Published: 2024-11-07
Subjects: Physical Sciences and Mathematics
The Malay Basin has received significant attention for geological carbon dioxide storage (GCS), but there are no published studies addressing the selection of appropriate deep saline aquifers. This study closes this gap. We process spatial data and use geological modelling and cluster analysis to identify optimal areas for GCS, considering various subsurface characteristics such as temperature, [...]
Flood Resilience Assessment of Interconnected Critical Infrastructures
Published: 2024-11-07
Subjects: Civil and Environmental Engineering, Engineering, Environmental Engineering, Environmental Sciences, Risk Analysis, Systems Engineering, Water Resource Management
Undertaking systemic risk assessments of critical infrastructures (CIs) is necessary to improve understanding, mitigate impacts, and increase resilience to cascading effects of intensifying hydrometeorological hazards. This paper presents a novel quantitative approach for simulating local physical interdependencies between multiple infrastructure sectors that may be disrupted by floods. [...]
Unravelling sustainable development at the sub-national scale in India
Published: 2024-11-07
Subjects: Ecology and Evolutionary Biology, Environmental Studies, Life Sciences, Nature and Society Relations
India's diverse socioeconomic landscape and environmental challenges make it a complex case for implementing the UN Sustainable Development Goals (SDGs). Despite India's federal structure, comprehensive research on subnational SDG progress is lacking. This study analysed progress, challenges, interlinkages, and spatial disparities in individual and grouped SDGs (environmental, social, and [...]
Population estimation using 3D city modelling and Carto2S datasets - A case study
Published: 2024-11-07
Subjects: Engineering
With the launch of Carto2S series of satellites, high resolution images (0.6-1.0 meters) are acquired and available for use. High resolution Digital Elevation Model (DEM) with better accuracies can be generated using C2S multi-view and multi date datasets. DEMs are further used as an input to derive Digital terrain models (DTMs) and to extract accurate heights of the objects (building and tree) [...]
Ocean and Coastal Acidification Monitoring Priorities for the Northeast US and Eastern Canada
Published: 2024-11-06
Subjects: Environmental Monitoring, Geochemistry, Oceanography, Planetary Geochemistry
The Interagency Working Group on Ocean Acidification monitoring Prioritization Plan 2024 calls for Coastal Acidification Networks to identify the ocean and coastal acidification (OCA) monitoring needs most important for their regions. The Northeast Coastal Acidification Network (NECAN) organized a webinar series to study regional needs, which culminated with a workshop in November 2023. This [...]
A dual lake approach reveals the impact of Holocene oxygen availability and climate on molecular proxy records in the sub-Arctic
Published: 2024-11-06
Subjects: Physical Sciences and Mathematics
Ancient DNA and branched glycerol dialkyl glycerol tetraethers (brGDGTs) are new, powerful tools to reconstruct past ecosystems and climate in high-latitude lakes, but often require contrasting oxygen conditions for reliable interpretations. Here, we present a new approach using adjacent oxic and anoxic lakes to 1) better understand how redox potential impacts these proxies using isoprenoid [...]