Extraction of Land Covering Information Based on Decison Tree in Penglai City
di xiang-hong1; wang zhou-long1; zhang ming-ming1; zhang shu-ping2(1.geographic and planning college of ludong university; shandong yantai 264025; china; 2.sishui shiyan middle school in shandong province; shandong sishui 273200; china)
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Study on Comprehensive Management of Land Subsidence in Jinqiao Coal Mine in Shandong Province
shou ji-ping1; zhang tai-ping1; 2; lv xiao-zhou3(1.shandong institute and laboratory of geological sciences; shandong jinan 250013; china; 2.environmental science and engineering college of china ocean university; shandong qingdao 260000; china; 3.shandong geophysical and geochemical exploration institute; shandong jinan 250013; china)