Results 91 to 100 of about 4,147 (202)

River Ice Analyses and Roughness Calculations Using Underwater Drones and Photogrammetric Approach

Hydrological Processes, Volume 40, Issue 7, July 2026.
This study presents a methodology for determining hydraulic roughness (Manning's n) of fluvial ice using underwater drone and Structure from Motion (SfM) photogrammetry. The findings show that cost‐efficient equipment can be used to determine Manning's n for river ice, which supports modelling efforts, especially under intense warming in northern areas.
Reeta Vaahtera, Juha‐Matti Välimäki, Tuure Takala, Eliisa Lotsari   +3 more
wiley   +1 more source

GNSS Real-Time Kinematic Positioning [PDF]

This open access book presents the high-precision Real-Time Kinematic (RTK) positioning technique of global navigation satellite systems, including its development, principle, implementation, applications and recent innovations. As the highlights of this
Li, Bofeng, Zhang, Zhetao, Miao, Weikai
core   +1 more source

Uncertainty assessment for a novel optically shallow water radiometric acquisition platform

Limnology and Oceanography: Methods, Volume 24, Issue 7, July 2026.
Abstract We present a novel motorized platform, a custom‐built jet‐ski designed for acoustic and radiometric measurements in optically shallow coastal waters. This platform integrates in‐water radiometers with single‐beam and multi‐beam acoustic sensors, along with a suite of active and passive instruments (conductivity‐temperature‐depth, fluorescence,
Raphaël Mabit, Simon Bélanger, Pascal Bernatchez   +2 more
wiley   +1 more source

Real Time Kinematic paikannuksen avustaminen 3D pintamallilla sekä taivaskameralla [PDF]

, 2017
This study presents an approach to obstruction masking for GNSS Real Time Kinematic (RTK) positioning using information from 3D models and sky-view images.
Joensuu, Ville
core  

Development of a Network Real-Time Kinematic processing platform [PDF]

, 2009
Single baseline “real-time kinematic” (RTK) GNSS positioning is a carrier-phase-based relative positioning technique that delivers centimetre-level accuracy in real-time. In general, this technique satisfies the GPS receiver manufacturers?
Li, B ; https://orcid.org/, Lim, S ; https://orcid.org/, Heo, Y, Rizos, C ; https://orcid.org/   +3 more
core   +2 more sources

Evaluating Repeatability of RTK GPS/GLONASS Near/Under Forest Environment

Croatian Journal of Forest Engineering, 2010
Until the mid-1990s, post-processing was the only method available to determine survey- grade positions using GPS. Anew method was then introduced called Real-Time Kinematic (RTK). Real Time Kinematic surveying is an advanced form of relative GPS carrier
Atinç Pirti, Kutalmiş Gümüş, Halil Erkaya, Ramazan Gürsel Hoşbaş   +3 more
doaj  

Comparison of Orthomosaic Accuracy Based on Unmanned Aerial Vehicle (UAV) Real Time Kinematic (RTK) Radio and RTK NTRIP in Padang City, West Sumatra

JURNAL GEOGRAFI
UAVs with RTK technology offer high-accuracy aerial mapping, with RTK Radio and RTK NTRIP as two correction methods affecting orthomosaic precision. While previous studies compared these methods in terrestrial surveys, their impact on UAV-based orthomosaics remains underexplored.
Muhammad Ismail, Bayu Wijayanto, Randi Proska Sandra, Wikan Jaya Prihantarto, Elisa Maiyenti, M Sriharta, Rahmat Fitrian, Mutiara Amelia Putri   +7 more
openaire   +2 more sources

Capturing the Multi‐Decadal Evolution of Glacier–Permafrost Interactions in a High‐Alpine Environment (Ritord, Western Swiss Alps)

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 473-497, July/September 2026.
ABSTRACT This study investigates the multi‐decadal evolution of a glacier forefield under permafrost conditions in the Combins Massif (western Swiss Alps). A multi‐method approach based on historical and recent datasets is used to analyze its landform components.
Julie Wee, Hanne Hendrickx, Sebastián Vivero   +2 more
wiley   +1 more source

RTK-EVC: Real-Time Kinematic Positioning With Enhanced Velocity Constraints via Factor Graph Optimization in GNSS-Challenged Environments

IEEE Transactions on Vehicular Technology
In this paper, we propose a novel Real-Time Kinematic positioning architecture with Enhanced Velocity Constraints (RTK-EVC) which is solved by factor graph optimization. The RTK procedure has been redesigned, which consists of three phases: the velocity estimation, the position estimation and the Partial Ambiguity Resolution (PAR) augmented by the Dead
Qijia Zhao, Sudan Yan, Gang Liu, Rong Zhang 0005, Shaolin Lü, Jianan Lou   +5 more
openaire   +1 more source

Assessment of Affordable Real-Time PPP Solutions for Transportation Applications

Algorithms
With the availability of multi-frequency, multi-constellation global navigation satellite system (GNSS) modules, precise transportation applications have become attainable.
Mohamed Abdelazeem, Amgad Abazeed, Abdulmajeed Alsultan, Amr M. Wahaballa   +3 more
doaj   +1 more source