Journal of Surveying Engineering: Recent submissions

Now showing items 661-680 of 1023

    • Variance Component Estimation and Precise GPS Positioning: Case Study 

      Christian Tiberius; Frank Kenselaar (American Society of Civil Engineers, 2003)
      The underlying motivation of variance component estimation (VCE) is to construct an adequate variance-covariance (VC) matrix for the processing of global positioning system (GPS) code and phase data. Prior to developing a ...

    • Georeferencing Aerial Photography: Beginners Approach 

      Ahmad S. Massasati (American Society of Civil Engineers, 2002)
      Georeferencing aerial photographs has always been a challenge. Computer technology makes it possible to georeference digital aerial photographs without an in-depth understanding of the underlying theory. For students of ...

    • Transformation of Survey Coordinates—Another Look at an Old Problem 

      William H. Sprinsky (American Society of Civil Engineers, 2002)
      A procedure is discussed that combines the best aspects of the usual “rigid body” (three parameter affine) and the similarity (Helmert) least-squares procedures found in most civil engineering enhancements to popular ...

    • Reviewers 

      Unknown author (American Society of Civil Engineers, 2002)

    • Functional Models and New Stochastic Model in Combined Leveling Nets 

      M. Zeki Coşkun; O. Baykal (American Society of Civil Engineers, 2002)
      The aim of this study is to improve functional models and to form a new stochastic model that takes into account both different measurement methods and important sources of errors affecting the accuracy of the measurements ...

    • How Accurately Can We Determine Orthometric Height Differences from GPS and Geoid Data? 

      Georgia Fotopoulos; Christopher Kotsakis; Michael G. Sideris (American Society of Civil Engineers, 2003)
      The optimal combination of global positioning system (GPS) geometric heights with gravimetrically derived geoid undulations for the determination of orthometric heights above mean sea level (GPS/geoid leveling), or more ...

    • Application of Theil Model to Adjustments of Network Densifications 

      Rongshin Hsu (American Society of Civil Engineers, 2002)
      A new least-squares solution to the Theil model is presented. The proposed solution is particularly suitable for applications of network densifications. By assuming fictitious observations made on the constraints, the ...

    • Developing Carrier-Phase Differential Global Positioning System Networks with Partial Derivative Algorithms 

      Christopher C. Varner; M. Elizabeth Cannon (American Society of Civil Engineers, 2002)
      Centimeter-to-decimeter-level positioning accuracy from the global positioning system (GPS) requires the use of carrier-phase measurements. The system is generally operated in a double differential mode in which a nearby ...

    • Automated Least-Squares Adjustment of Triangulation-Trilateration Figures 

      W. C. Hu; Wilson H. Tang (American Society of Civil Engineers, 2001)
      Two nonlinear horizontal survey adjustment problems, one for a triangle and the other for a quadrilateral, were analyzed in Smith and Varnes (1987) using traditional methods. This paper demonstrates a new approach to solve ...

    • Spatial Data, Coordinate Systems, and the Science of Measurement 

      Earl F. Burkholder (American Society of Civil Engineers, 2001)
      Many disciplines work with spatial data and use a geographic information system to reference geospatial data. Based upon a concise definition of spatial data, this paper describes how spatial data and their accuracy are ...

    • Use of Geoid for Assessing Trigonometric Height Accuracy and Detecting Vertical Land Motion 

      Cheinway Hwang; Lih-Shinn Hwang (American Society of Civil Engineers, 2002)
      An improved geoid model for Taiwan was developed using land and sea gravity anomalies and altimeter-derived geoid gradients by least-squares collocation. The estimated model accuracy ranges from 2 cm in the flat area to ...

    • Remote Sensing and Geographic Information System Based Approach for Watershed Conservation 

      Sujata Biswas; S. Sudhakar; V. R. Desai (American Society of Civil Engineers, 2002)
      Conservation of natural resources is essential to sustain any developmental activity, and such measures especially for soil and water carried out on a watershed basis are very useful for watershed management. In this ...

    • Enhancing Precision of Global Positioning System using Short-Range Distance Baseline Field 

      Chun-Sung Chen; Ta-Kang Yeh (American Society of Civil Engineers, 2002)
      This paper presents two novel concepts to improve the precision of global positioning system (GPS). First, observations of the low cutoff angle are applied to GPS positioning for obtaining more information to enhance ...

    • Analytical Solution for the Amplitude Ratio Method for Determining Mean High Water in Tidal Regions 

      Joshua Greenfeld (American Society of Civil Engineers, 2002)
      In areas that are subject to tidal waters, projects such as bridge construction and property boundary location require the determination of the water level or water datum. Of the different water data that can be established, ...

    • Application of Gauss-Bonnet Theorem to Geodesy 

      Gaye Kızılsu (American Society of Civil Engineers, 2002)
      The Gauss-Bonnet theorem was studied and applied to a geodesic triangle and the results given. The aim of this paper is to take a subject whose results are given mostly superficial treatment and present a more clear and ...

    • Strategy for Designing Geodetic Network with High Reliability and Geometrical Strength 

      Alireza Amiri Seemkooei (American Society of Civil Engineers, 2001)
      The main design criteria in a geodetic network are precision, reliability and strength, and economy. The proper design of geodetic networks is an integral part of the geodesist's task. The main goal of this paper is to ...

    • Hydrographic Surveying from Personal Watercraft 

      Jamie MacMahan (American Society of Civil Engineers, 2001)
      A hydrographic surveying system has been designed and tested to acquire nearshore beach profile data. Traditional vessel-mounted echosounder surveying instrumentation was placed in watertight containers and configured for ...

    • Establishment and Maintenance of Taiwan Geodetic Datum 1997 

      Ming Yang; Ching-Liang Tseng; Jyh-Yih Yu (American Society of Civil Engineers, 2001)
      A well-defined three-dimensional geodetic datum is essential to the development of a modernized nation. Also, it is of importance for the geodetic datum to be sufficiently accurate at all times to meet the requirements of ...

    • Free Station Method of Leveling 

      W. F. Teskey; R. S. Radovanovic (American Society of Civil Engineers, 2001)
      A new method of leveling, suitable for high-precision industrial applications, is described. The observation procedure involves only minor modifications to the standard observation procedure for precise leveling. The ...

    • Combined Analysis of Real-Time Kinematic GPS Equipment and Its Users for Height Determination 

      W. E. Featherstone; M. P. Stewart (American Society of Civil Engineers, 2001)
      Ellipsoidal and Australian Height Datum heights have been determined for a 60-point control network from five base stations by three separate users using three different makes of real-time kinematic (RTK) global positioning ...