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Modeling and implementation of situation symbols in emergency thematic cartography

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5 Author(s)
Zhonghai Yu ; School of Resource and Environment Science, Wuhan University, Wuhan, China ; Lin Li ; Junwu Qiu ; Zhigang Cheng
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According to the needs of emergency thematic cartography and the China's existing `Specification for the military symbols', the types of situation symbols that may be used in emergency thematic cartography were summed up in this paper. A comprehensive modeling was raised for these situation symbols and it is flexible for emergency thematic cartography. There are four kinds of situation symbols: contour symbol, simple arrow symbols, single arrow symbols and combined arrow symbols in this paper. The position line of the symbols is a Bezier curve or a polyline. The oblique axis parabolic algorithm and the Hermite interpolation algorithm are selected for smoothing the position lines of the symbols. The Douglas-Peucker algorithm is picked out for scattering the position curve. At last, this paper developed a cartographic system based on the national fundamental geographic information, and realized the modeling and drawing of the situation symbols with the cartographic system.

Published in:

Geoinformatics, 2011 19th International Conference on

Date of Conference:

24-26 June 2011