Journal of Surveying Engineering: Recent submissions
Now showing items 421-440 of 1001
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Evaluation of GPS/Galileo RTK Network Configuration: Case Study in Greece
(American Society of Civil Engineers, 2011)Network-based real-time kinematic (NRTK) positioning in local or regional reference networks has been proven to be an efficient technology for high precision global positioning systems (GPS) positioning over the last few ... -
An Improved Weighted Total Least Squares Method with Applications in Linear Fitting and Coordinate Transformation
(American Society of Civil Engineers, 2011)This paper presents an improved weighted total least squares (IWTLS) method for the errors-in-variables (EIV) model with applications in linear fitting and coordinate transformation. In addition, an improved constrained ... -
Detection of Outliers in GPS Measurements by Using Functional-Data Analysis
(American Society of Civil Engineers, 2011)The identification of outliers in global positioning system (GPS) observations—to compare equipment, positioning methods, or working conditions—has traditionally been performed using univariate or multivariate statistics. ... -
Linking Surveying, Engineering, GIS, and Computer Science into Geomatics through a Digital Terrain Modeling Course
(American Society of Civil Engineers, 2011) -
Time Correlation in GNSS Positioning over Short Baselines
(American Society of Civil Engineers, 2012)Ignoring the temporal correlations present within global navigation satellite systems (GNSS) observations can result in too much confidence being placed in the estimated positions. Temporally correlated errors occur when ... -
Deformation Assessment Considering an A Priori Functional Model in a Bayesian Framework
(American Society of Civil Engineers, 2011)Monitoring Earth-surface deformations with surveying instruments plays a key role in the knowledge of dynamics and the evolution of geophysical phenomena. During this stage, it is important to adopt an appropriate check ... -
PPP Technique Analysis Based on Time Convergence, Repeatability, IGS Products, Different Software Processing, and GPS+GLONASS Constellation
(American Society of Civil Engineers, 2011)In recent years interest has increased for precise point positioning (PPP), which provides an alternative to precise relative processing because of its potential as a reliable absolute positioning technique. PPP technique ... -
Nonexistence of Rigorous Tests for Multiple Outlier Detection in Least-Squares Adjustment
(American Society of Civil Engineers, 2011)The present paper focuses on the theory of outlier detection in least-squares adjustment. Although the case of a single outlier can be efficiently handled, extensions of the testing theory to the multiple outlier case seem ... -
Machine Learning Techniques Applied to the Assessment of GPS Accuracy under the Forest Canopy
(American Society of Civil Engineers, 2011)The geographic location of points using global positioning system (GPS) receivers is less accurate in forested environments than in open spaces because of signal loss and the multipath effect of tree trunks, branches, and ... -
MINQUE of Variance-Covariance Components in Linear Gauss-Markov Models
(American Society of Civil Engineers, 2011)For heterogeneous and correlated observations, the variance components and the covariance components sometimes must be estimated. The forms of best invariant quadratic unbiased estimate (BIQUE) and Helmert-type estimation ... -
Polynomial Solutions of Transition Curves
(American Society of Civil Engineers, 2011)The solutions of transition curves presented in this paper are new geometric solutions that can be used in various tasks related to road designing. Their basic advantage is that they form groups of transition curves. This ... -
Optimal Integration of Single-Baseline GPS Solutions in Network-Based Kinematic Positioning
(American Society of Civil Engineers, 2011)Although the demand for high accuracy kinematic positioning using multiple base stations has increased over the last several years, most commercial GPS processing software still only provides single-baseline solutions. ... -
Modeling Systematic Errors for the Angle Measurement in a Virtual Surveying Instrument
(American Society of Civil Engineers, 2011)The minimization and elimination of errors caused by instrumental imperfections or human operation is an important topic in surveying education. Nevertheless, despite the clear and definite behaviors of each surveying ... -
GPS Vector Network Adjustment in a Local System of Coordinates Based on Linear-Angular Spatial Pseudo-Observations
(American Society of Civil Engineers, 2011)The idea of integrated measurements, combining classic field observations and satellite observations, has recently been applied in geodetic work with increasing frequency. To draw an entire set of such observations ... -
Estimation of Variance Components Using a Step-by-Step Approach
(American Society of Civil Engineers, 2011)We may obtain a unique parameter vector solution from a combination of individually estimated parameter vectors by adjusting different observation groups. This kind of combination method, the so-called step-by-step procedure, ... -
Preliminary Evaluation of Baseline Relative Accuracies Using L1 Frequency Observations of Navigation-Grade GARMIN Receivers
(American Society of Civil Engineers, 2011)Handheld navigation global positioning system (GPS) receivers are significantly cheaper and their position determination accuracy is less than their geodetic-grade counterparts. Although the main observable in most low-cost ... -
Tropospheric Modeling and Fixed Stations Constraints in Precise GPS Computations: Case Study
(American Society of Civil Engineers, 2011)Accurate GPS positioning requires correct modeling of tropospheric refraction, the phenomenon responsible for tropospheric delay (TD). The Niell mapping function, which is used in almost all processing packages to model ... -
Deformation Analysis by Means of Extended Free Network Adjustment Constraints
(American Society of Civil Engineers, 2011)Deformation parameters are estimated based on a time series of monitoring campaigns. For each monitoring campaign, the measurements’ contribution is in determining the relative positions of the network points and defining ... -
Analysis of Digital Data Obtained from Raster and Vector Maps
(American Society of Civil Engineers, 2011)In accordance with the advancement of technological development, access to all types of digital data is becoming increasingly important. Various problems are commonly faced when obtaining digital data from existing maps. ... -
Evaluation of the Credibility of Reflectorless Distance Measurement
(American Society of Civil Engineers, 2010)Reflectorless distance measurement provides the ability to easily make quick measurements saving time and labor for surveyors. The precision and accuracy of these types of measurements are under discussion because of the ...