Journal of Surveying Engineering: Recent submissions

Now showing items 681-700 of 1023

    • Local Height Determination Using GPS-Monitored Atmospheric Path Delays 

      Joz Wu; Fong-Gee Yiu (American Society of Civil Engineers, 2001)
      National satellite control points, or any fixed points determined relative to a known control point, can serve as monitoring stations when equipped with dual-frequency global positioning system (GPS) receivers. The available ...

    • Differential GPS Geometric Rectification of Fine-Resolution Aircraft Scanner Data 

      Jonathan D. Witter; John G. Lyon; Barry M. Puskas (American Society of Civil Engineers, 2001)
      High-resolution aircraft or satellite data often require ground or image control for rectification of images, and this is best performed using control with a similar level of spatial resolution. To demonstrate the use of ...

    • Transformation of Ellipsoid Heights to Local Leveling Heights 

      M. Yanalak; O. Baykal (American Society of Civil Engineers, 2001)
      The aim of this study is to evaluate the use of interpolation methods, which are used for digital terrain modeling, in transformation of Global Positioning System (GPS) ellipsoid heights to local heights. To test the ...

    • Empirical Method of Error Analysis in Volume Estimation: Monte Carlo Simulation Under Kriging and Triangulation 

      G. Taylor; A. Y. T. Kudowor; D. Fairbairn (American Society of Civil Engineers, 2001)
      Volume estimation packages often lack tools for measuring and analyzing the effect of input data uncertainty and possible error propagation in the volume estimation process. This paper proposes and develops an empirical ...

    • Helmert Method as Equivalent of Iterated Almost Unbiased Estimation 

      R. Hsu (American Society of Civil Engineers, 2001)
      By a minor change in the weighting policy, the complicated Helmert model can be mathematically reduced to an exact equivalent of iterated almost unbiased estimation (IAUE). Such an approach is referred to as the modified ...

    • Rotation Parameters—a Survey of Techniques 

      Martin Nitschke; Ernst Heinrich Knickmeyer (American Society of Civil Engineers, 2000)
      A number of parameterizations of rotations in three-dimensional space are compared with respect to their formulas and qualitative characteristics relevant for practical use. The number and uniqueness of parameters, ...

    • Height Estimation Methods for Filling Gaps in Gridded DTM 

      Yaron Katzil; Yerahmiel Doytsher (American Society of Civil Engineers, 2000)
      Digital terrain models (DTMs) describing the relief of the terrain constitute a central component of mapping and geographic information systems, in general, and photogrammetric mapping, in particular. In practice, the ...

    • Precomputing Influences of Observation for a Network 

      Rongshin Hsu (American Society of Civil Engineers, 2000)
      Formulae for judging a priori the influences of individual observations on the unknown parameters and the mean network precision are presented. The influences of an observation on the parameters and the mean network precision ...

    • Determining Angular and Linear Distortions on the Map Base 

      Gaye Onursal; Zafer Kizilsu (American Society of Civil Engineers, 2000)
      The effects of dimensional changes on the base materials of maps and plans produced for engineering and cadastral purposes are studied from a different perspective. First, physical specifications of the map base materials ...

    • Automatic Monitoring of Slope Deformations Using Geotechnical Instruments 

      Xiaoli Ding; Dayong Ren; Bruce Montgomery; Chris Swindells (American Society of Civil Engineers, 2000)
      Monitoring the deformation and other useful physical parameters of slopes, either natural mountain slopes or those formed in open pit mining or construction, is one of the most effective methods to avoid or reduce the risk ...

    • Topographic Mapping Using Topex Satellite Altimetry 

      Robin A. Vaughan; Zeinal Karamjavan (American Society of Civil Engineers, 2000)
      Radar altimeters were designed to collect height data over ocean surfaces where there are few sudden changes in elevation to send the instrument off-lock. Because land surfaces are not smooth over the fairly large footprint ...

    • Parallel Partitioned Inverse Method for Least-Squares Adjustment 

      Joon Heo; Yoomi Rho (American Society of Civil Engineers, 2000)
      Parallel computing is undoubtedly the trend in numerical applications of highly intensive computation. There has been much related research and development on parallel computer architecture, algorithm design, and supplementary ...

    • Refinement of Gravimetric Geoid Using GPS and Leveling Data 

      W. E. Featherstone (American Society of Civil Engineers, 2000)
      A gravimetric geoid model does not allow the accurate transformation of Global Positioning System (GPS) ellipsoidal heights to Australian Height Datum (AHD) heights in the Perth region of Western Australia. This is ...

    • GPS Alignment Surveys and Meridian Convergence 

      Tomás Soler; Rudolf J. Fury (American Society of Civil Engineers, 2000)
      Since the advent of the Global Positioning System (GPS), geodetic azimuths can be accurately computed by simple implementation of well-known 3D concepts. However, when GPS alignment surveys involving azimuths are designed ...

    • Transformation of Cartesian to Geodetic Coordinates without Iterations 

      Rey-Jer You (American Society of Civil Engineers, 2000)
      A noniterative transformation of earth-centered, earth-fixed (ECEF) Cartesian coordinates to geodetic coordinates of a point is presented. The transformation is based on ellipsoidal coordinates. The ECEF Cartesian coordinates ...

    • Generalized Shrunken-Type Robust Estimation 

      Gui Qingming; Liu Jinshan (American Society of Civil Engineers, 1999)
      The parameter estimation problem in surveying adjustment is considered when outliers and multicollinearity exist simultaneously. A class of new estimators—generalized shrunken-type robust estimators—are proposed by grafting ...

    • Determination of Local Geoid with Geometric Method: Case Study 

      Yang Zhan-ji; Chen Yong-qi (American Society of Civil Engineers, 1999)
      Precise determination of a local geoid is of particular importance for global positioning system (GPS) height determination. The geometric method has been widely used for a relatively small area, which interpolates geoid ...

    • Improvement of GPS Relative Positioning Accuracy by Using SNR 

      Lawrence Lau; Esmond Mok (American Society of Civil Engineers, 1999)
      Interference and multipath are the main error sources of Global Positioning System (GPS) measurement in engineering surveying. This paper describes an algorithm that mitigates specular multipath as well as interference in ...

    • Optimum Vertical Curves for Highway Profiles 

      Said M. Easa (American Society of Civil Engineers, 1999)
      Information on the vertical alignment of existing old highways is often not available. To evaluate the highway alignment, it is necessary to fit vertical curves (parabolic curves and associated tangents) to the observed ...

    • Estimation of Error and Compliance in Surveys by Kriging 

      John M. H. Barton; Steven G. Buchberger; Michael J. Lange (American Society of Civil Engineers, 1999)
      This paper demonstrates how a geostatistical method called