| Forest fire prevention means taking various precautions and control measures for preventing forest fire. Forest fire not only can burn vast land of forest and doing serious harm to forestry and environment of forest regions, but also may cause heavy losses to the national economy.Therefore, forest fire prevention is a regular and essential job for forest protection and forestry development.The forest fire position will be located rapidly and accurately by widely using the video monitoring technology of forest fire prevention as well as the digital rotational station which returns the real-time observation angles.This technique not only improves the intelligence of video mornitoring system, but also is useful to the decision-making of forest fire prevention.This work was supported in part by the Graduate Student's Optional Subject Fund of Beijing Forest University in 2006, some desiderated problems are studied and discussed in this paper. The main conclusions and achievements are as follows:⑴The feasibility of the automatic positioning techniques in forest fire video monitoring based on GIS was demonstrated by discussing the domestic positioning problems in video monitoring system which is urgent to be solved.(To see the 1st Chapter)⑵The double-point positioning, single-point positioning and multi-point positioning in locational techniques were studied in this paper, and progressive exhaustive method was applied to single-point positioning of forest fire prevention for the first time, meanwhile, the multi-point positioning was emphasized.(To see the 2nd Chapter)⑶According to the practical geographical requirements in Miaofengshan forest farm, the general frame of the forest fire video monitoring automatic positioning system based on GIS was put forward. Moreover, the spatial database,the logical database and the physical database were designed for the system.(To see the 4th Chapter)⑷Based on the established table structure of forest fire positioning system which has been designed, the software of forest fire monitoring positioning system was developed.(To see the 4th Chapter) ⑸The forest fire monitoring positioning system software debugging was completed, and the foundation function of geography information map, forest fire double-point localization function, single-point localization function and the fire situation plotting function were realized.(To see the 5th chapter)In brief,forest fire positioning subsystem in the forest fire video monitoring system was developed independently by the subject. According to the azimuth angle and the pitching angle returned by the digital rotational station, plot the fire point on the electronic map can be plotted automatically in this subsystem. Therefore, it provides the indispensable key location for forest fire protection, also one of the video monitoring system's positioning techniques in China was spanned in this paper. |
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