Power system ; wide area information ; security control ; optimal reclosing ; trajectory concaveness and convexness

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Based on the Arcview platform and compiling programs by ourselves, the DLPM of urban area of Jinan in 1998 and 2001 is established. The main conclusions are: 1 general trend of land price is reduction from central base point to urban edge, but there are different characteristics in different direction; 2 from one edge to another, land price shows low-high-low, and its sections through urban areas show normal school and deflection normal school; 3 land price evolutes with time, concaveness land price terrace changes little or gentle or protruding, and protuberant land price terrace changes little or not, price terrace or big or gentle; 4 the increasing potential of price is analyzed by the increasing rate and increasing speed of land price.

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