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Defining the basic entities in a geodetic data base

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Abstract

The term “entity” covers, when used in the field of electronic data processing, the meaning of words like “thing”, “being”, “event”, or “concept”. Each entity is characterized by a set of properties.

An information element is a triple consisting of an entity, a property and the value of a property. Geodetic information is sets of information elements with entities being related to geodesy. This information may be stored in the form of data and is called a geodetic data base provided (1) it contains or may contain all data necessary for the operations of a particular geodetic organization, (2) the data is stored in a form suited for many different applications and (3) that unnecessary duplications of data have been avoided.

The first step to be taken when establishing a geodetic data base is described, namely the definition of the basic entities of the data base (such as trigonometric stations, astronomical stations, gravity stations, geodetic reference-system parameters, etc...).

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Literature

(A) Geodetic Literature on or related to Data Bases and Data Base Management

  • David E. ALGER, and Joseph C. GURLEY: A Design for a Geodetic Data Base Management System, in Proceedings of the American Society of Photogrammetry, 41st Annual Meeting, March 9–14, 1975, ASP, Falls Church, Virginia, USA.

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  • J.P. LEPRETRE: Progress Report for the Creation of a Worldwide Grevimetric Data Bank, Bureau Grevimétrique International, Bulletin d’lnformation, No. 39, Nov. 1976.

  • T.A. PORTER: Canadian National Positional Control Survey Date File, A Geodetic Data Bank for Canada, The Canadian Surveyor, Vol. 28, No. 5. (1974), pp. 724–731.

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  • Charles R. SCHWARZ: The Geodetic Data Base at NGS, presented at the XVI General Assembly of IUGG, Grenoble 1975.

  • James E. STEM: The NGS Data Base as a Central Depository of Geodetic Control Data, ACSM, 1976, pp. 49–57.

(B) General Literature on Data Bases and Data Base Management

  • CJ. DATE: An Introduction to Data-Base System, Addison-Wesley, Reading, Mass., 1975.

  • R.W. ENGLES: A Tutorial on Data-Base Organization, Annual Review in Automatic Programming, Vol. 7, part 1, 1972, pp. 1–64.

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  • James P. FRY: Evolution of Date-Base Management Systems, computing Surveys, Vol. 8, No. 1 (1976), pp. 34–42. (This volume of Computing Surveys contains several other very interesting papers on Data Base Management with extensive literature lists).

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  • Paul LINDGREEN: Basic Operations on Information as a Basis for Data Base Design, Information Processing 74, (1974), North-Holland Publishing company, pp. 993–997.

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Authors and Affiliations

  1. Geodaetisk Institut, Gamlehave Allé 22, DK-2920, Charlottenlund

    C. C. Tscherning

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  1. C. C. Tscherning
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Tscherning, C.C. Defining the basic entities in a geodetic data base. Bull. Geodesique 52, 85–92 (1978). https://doi.org/10.1007/BF02521794

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