简介:AnOracle8i-basedap-proachisproposedtomanagetheinte-grateddatabasesoflargeCyberCity.Thisapproachconsistsofthreeisdesignedtoacceleratespatialretrieving,inwhichtheboundingboxesoflocalregionshavenointersectionandallleafnodesoftheR+-tree(geome-tryrecords)havenorepetition;rithmsareadoptedtocompressthedigitalelevationmodels,3Dvectormodelsandimages,suchasLZ77losslesscompressionalgorithmforcompressionofvectordataandJPEGcompressionalgorithmsfortextureim-Oracle8idatabase,aCyberCityGISspatialdatabaseengine(SDE)isdesigned.OnthebasisofthisSDEpro-totypeacasestudyisdone.
简介:太原市燃气设计有限公司是隶属于太原市煤气公司的全民所有制企业,是山西省建设厅资格审查批准可承担城镇燃气输配工程设计的专业单位。可担负燃气输配工程的项目建议书、可行性研究报告的编制、燃气输配管网、储配站、调压站和工业、公共建筑、居民用户庭院户内燃气工程施工图设计以及与之配套的土建、土暖.