Take the SPOT remote sensing images for a district in June 2009 as study object, using the texture feature methods based on the wavelet transform to the extraction for image water information, the results show that: The introduction of the wavelet transform and the edge of the restrictions to the the split of waters , can effectively extract and classify different colors, types of water bodies .
Considering the requirement analysis,the thesis discusses and analyses the general design and function constitution of the civil air defense engineering management system. It adapts groupware GIS and Visual Studio platform by web interface to realize the system based on B/S model. The thesis detailedly analyses the design and implement of client layer, intermediate service layer and data layer. The system improves the shortage of the traditional civil air defense work, and realizes information office work.
The primary goal of this research is to keep the good performance of the LANs communications pass through the five categories of unshielded twisted pair. This is a working theory based on the idea that is to illustrate the optimizing character of Hub-spoken topology. The foundation and the features of Hub-spoken topology and the five categories of unshielded twisted pair are explained in detail. The concept of the dependable margin motion coefficient was put forward on the basis of the margin motion coefficient and the reliability coefficient. This research aims at providing the best solutions of Hub-spoken topology to improve performance of the LANs communications.
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