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Visibility and viewshed algorithms in an information system for environmental management

Tsouchlaraki Androniki, George Achilleos

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URIhttp://purl.tuc.gr/dl/dias/BD5BA782-FE05-41D2-8315-A0531F37E3A5-
Identifierhttps://doi.org/10.2495/MIS040121-
Languageen-
Extent13 pagesen
TitleVisibility and viewshed algorithms in an information system for environmental managementen
CreatorTsouchlaraki Andronikien
CreatorΤσουχλαρακη Ανδρονικηel
CreatorGeorge Achilleosen
PublisherWIT Pressen
Content SummaryViewshed calculation is one of the basic procedures existing in an Information System, which has the ability to manage elevation data. Visibility calculation used to be a very time consuming procedure. The rapid development of computer technology propagated the demand for faster and better algorithms, of higher quality and of a more sophisticated logic. Viewshed depends on the height of the viewing point. The alteration of this height brings alteration of the viewshed. Different techniques have been developed concerning the different ways according to which: (a) data are collected from the Digital Elevation Model (DEM) for the viewshed calculation, (b) Visual Point and Target Point is defined horizontally and vertically, (c) the decision VISIBLE or NOT VISIBLE is taken for a point. An answer \“VISIBLE” or \“NOT” is not enough information to define if a point is really visible or not. Visibility depends on a series of factors and conditions that must be taken into account. This article attempts to collect all necessary information about visibility and viewshed analysis concerning conventional approaches. Basic viewshed algorithms are described, alternative methods of viewshed analysis are examined and different techniques used in viewshed calculation are referred. All this analysis of algorithms and techniques is accompanied by certain environmental application examples. Further on, factors that influence the accuracy of a viewshed and also possible control procedures are referred. Keywords: visibility, viewshed, GIS, environment, accuracy.en
Type of ItemΑφίσα σε Συνέδριοel
Type of ItemConference Posteren
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-19-
Date of Publication2004-
Bibliographic CitationG. Achilleos, A. Tsouchlaraki, “Visibility and viewshed algorithms in an information system for environmental management”, in the Fourth Inter. Conf. on Management Inf. Systems, incorp. GIS and Remote Sensing, pp. 109-121.doi:10.2495/MIS040121en

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