Abstract
AbstractSun-shadow positioning technology is a new positioning method, namely, by providing the changes in objects’ sun-shadow, to determine the location and date of shooting in communication networks. Based on the analysis of changes about the sun-shadow. This paper, by using the solar azimuth, elevation, declination angle, and solar hour angle, has established the mathematical model to determine the position and date of some objects. Firstly, the principle of the sun-shadow is analyzed by using the relevant parameters, sun-shadow and geographical coordinates and the provided moments. Secondly, it has used two different methods to calculate the positions. At last, it gets 40 groups of information about the length of straight shadow every one minute from 8:55 by using CAD software for video information processing. Then, it has soluted the actual length of shadow making use of a similar relationship. According to the relationship between the camera coordinate system and the world coordinate system, consulting the solution of the latitude and the longitude under the sundial model, we find the places in the video maybe in Hohhot during July.KeywordsAnalemmatic sundial modelSun-benchmark orientation methodCamera coordinate systemLongitude correction
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