Journal of Surveying Engineering: Recent submissions
Now showing items 21-40 of 1001
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Geodesic Intersections
(ASCE, 2024/08/01)A complete treatment of the intersections of two geodesics on the surface of an ellipsoid of revolution is given. With a suitable metric for the distances between intersections, bounds are placed on their spacing. This ... -
Least Squares Comparison of Two Rigorous Math Models Used to Fit a Triaxial Ellipsoid to a Cluster of Points
(ASCE, 2024/02/01)The least-squares (LS) method is universally embraced to obtain approximate unique solutions and their statistics from overdetermined scientific experiments where the number of observations amply exceeds the number of ... -
A Geometrical Approach to Multipath Localization and Mitigation for Static Undifferenced GPS Data
(ASCE, 2024/02/01)Multipath is a limiting factor for accurate positioning by global navigation satellite system (GNSS). Different hardware and computational techniques have been proposed for its mitigation. Here a geometrical approach for ... -
Investigation into the Effects of Different Parameters on Geoid Modeling Accuracy
(ASCE, 2024/05/01)Inconsistent geoid heights may introduce uncertainties that limit its use in applications. Consequently, the scientific community has been collaborating to determine more rigorous geoid models in order to improve the ... -
Parameter Estimation Methods for Correlated Observation Multiplicative Random Error Model in Geodetic Measurement
(ASCE, 2024/02/01)In the field of geodetic data processing, the existing literature on the treatment of the multiplicative random error model assumes that the random multiplicative error elements are independent of one another. However, ... -
Improving Stochastic Model of GNSS Precise Point Positioning with Triple-Frequency Geometry-Free Combination
(ASCE, 2024/05/01)The triple-frequency global positioning system (GPS), BeiDou navigation satellite system-3 (BDS-3), and Galileo can form the geometry-free and ionosphere-free (GFIF) carrier phase and pseudorange combinations, respectively. ... -
LEO Augmentation in Large-Scale Ionosphere-Float PPP-RTK Positioning
(ASCE, 2024/05/01)Precise point positioning-real-time kinematic (PPP-RTK) positioning combines the advantages of PPP and RTK, which enables the integer ambiguity resolution (IAR) without requiring a reference station nearby. The ionospheric ... -
sUAS LiDAR and Photogrammetry Evaluation in Various Surfaces for Surveying and Mapping
(ASCE, 2024/02/01)Small unmanned aircraft system (sUAS) photogrammetry and light detection and ranging (LiDAR) experienced fast development over the last decade, making the two technologies an integral component of surveying and mapping. ... -
Horizontal Reference Network Densification by Multiple Free Stations
(ASCE, 2023/11/01)Having available reference networks close to working areas minimizes error propagation and reduces costs to society when surveying or setting out engineering projects. The densification of reference networks using the ... -
Optimal Minimum L1-Norm Criteria for Outlier Identification in GNSS and Leveling Networks
(ASCE, 2023/11/01)The goal of this paper was to perform an exhaustive search regarding which combination of minimum L1-norm (MinL1) criteria is a better option for outlier identification. By means of Monte Carlo simulations (MCS), we compared ... -
A Test of Height Transfer Using Vertical Deflection Measurements by the Digital Zenith Camera VESTA
(ASCE, 2023/11/01)A test application of a height transfer method employing quasi-geoid undulation extrapolation using vertical deflection (VD) measurements obtained by the digital zenith camera VESTA (VErtical by STArs) is described. This ... -
Estimating Roadway Horizontal Alignment from Geographic Information Systems Data: An Artificial Neural Network–Based Approach
(ASCE, 8/9/2023 1)Estimating horizontal alignment using discretized roadway data points, such as GIS maps, is complicated because the number of curved and tangent segments and their start and end points are not known a priori. This study ... -
A New Modeling Approach for a Priori Uncertainties of Laser Tracker Angle Measurements
(ASCE, 6/26/2023 )Methods for modeling the uncertainty in laser tracker angle measurements vary within the metrology industry, leading to confusion and questionable stochastic modeling for survey network adjustments and error propagation ... -
Astronomic Positioning and Orientation Method for Inhomogeneous Stellar Distributions
(ASCE, 6/27/2023 )Astronomic positioning and orientation can be used to obtain the astronomic longitude and latitude of a station and the astronomic azimuth of a ground target by observing stars. The results of the positioning and orientation ... -
Multivariate Weighted Total Least Squares Based on the Standard Least-Squares Theory
(ASCE, 6/16/2023 )The weighted total least squares (WTLS) has been widely used in many geodetic problems to solve the error-in-variable (EIV) models in which both the observation vector and the design matrix contain random errors. This ... -
Improved GNSS/Acoustic Underwater Positioning with Between-Buoy Baseline Constraint
(ASCE, 7/27/2023 )Continuous seafloor transponder positioning with moored buoy observation system is an indispensable method for detecting seafloor crustal deformation. However, the between-buoy baseline information provided by the global ... -
MINQUE Method Variance Component Estimation for the Mixed Additive and Multiplicative Random Error Model
(ASCE, 8/4/2023 1)To address the problem of inaccurate mixed additive and multiplicative random error stochastic model weighting, we apply the minimum norm quadratic unbiased estimator (MINQUE) to a mixed additive and multiplicative random ... -
A Novel Time–Frequency Approach Based on the Noise Characterization for Structural Health Monitoring (SHM) Using GNSS Observations
(ASCE, 8/8/2023 1)In this manuscript, a novel time-frequency approach based on noise characterization is proposed for Structural Health Monitoring (SHM) using Global Navigation Satellite System (GNSS) observations. The Allan variance (AVAR) ... -
Amphibious Uncrewed Ground Vehicle for Coastal Surfzone Survey
(ASCE, 7/5/2023 1)The capability of a commercial off-the-shelf amphibious bottom crawling robot is explored for surveying seamless topography and bathymetry across the beachface, surfzone, and very nearshore. A real-time-kinematic (RTK) ... -
Computation of Circular Curve Elements Passing through Multiple Points by Using Cosine Theorem
(ASCE, 3/29/2023 )Studies have suggested various solutions for determining the center coordinates and radius of a circle curve that are desired to pass through points whose coordinates are known. One solution is via adjustment according to ...