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从空间数据库中标识一个地理目标子集的过程。被标识的目标必须满足特定的语义与空间关系准则。又称空间检索、空间数据选取。
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conservation of momentum
conservation of number principle
Conservation of Oil Paintings
conservation of orbital symmetry
conservation of particle number
conservation of rare and endangered medicinal resources
conservation of resource theory
conservation of tea germplasm
conservation of terrestrial ecology
conservation of vorticity
conservation of water source areas
conservation planning
Conservation Plan of Beihai Historic City
conservation plan of Beijing historic city
Conservation Plan of Changsha Historic City
Conservation Plan of Chaozhou Historic City
Conservation Plan of Chengde Historic City
Conservation Plan of Dali Historic City
Conservation Plan of Dujiangyan Historic City
Conservation Plan of Fenghuang Historic City
Conservation Plan of Guangzhou Historic City
Conservation Plan of Huize Historic City
Conservation Plan of Jianshui Historic City
Conservation Plan of Jiaxing Historic City
Conservation Plan of Jinan Historic City
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