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A New Approach to Relief Representation

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Relief representation presents a difficult problem. The surface of the Earth cannot be defined by a physical or mathematical representation but it can be approximated by digital elevation models (DEM), triangular irregular networks (TIN), and contour lines. Each representation carries approximation errors. A DEM introduces the greatest errors because we assume that the surface of the Earth can be approximated to a regular grid of elevations. A TIN introduces less error than a DEM because we use an irregular network of triangles to represent the relief. Contour lines describe the relief without approximation along each contour. Contour lines are the relief representation that introduces the least amount of error. In this paper we will present a new approach to relief representation using linear features. The new encoding approach is an extension of the Freeman chain code, where the regular coding grid is replaced by a circular structure.

Document Type: Research Article

Publication date: March 1, 2006

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  • Surveying and Land Information Science (SaLIS) is the official publication of the American Association of Geodetic Surveying (AAGS) and the Geographic and Land Information Society (GLIS).

    SaLIS is a scientific journal devoted to reporting research and new work conducted to advance geodetic surveying, land surveying, large-scale mapping, and geographic information systems designed to advance the development and management of the cadastral parcel data layer and other land information applications. SaLIS publishes research articles, technical papers, technical notes, papers on the current state of surveying education, surveying history, book reviews, and current literature reviews. Every four years, the journal publishes the U.S. Report to the International Federation of Surveyors (FIG). The Proceedings of the Surveying Teachers Conference are published bi-annually.

    For information about AAGS visit www.aagsmo.org
    For information about GLIS visit www.g-lis.org

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