The survey of land use at county level is the basic work for land management and the actual accurate data resource of land cover in our country.
县级土地利用调查是土地管理的基础性工作，是我国各级土地利用现状准确数据的实际来源。
The database of land use can provided more accurate and more scientific decisive information for the optimal management model of land resource if only spatial data origins are renovated periodically.
要使土地利用数据库的成果在土地资源管理的模式优化方面取得显著成就，必须定期革新数据源。
Land resource management need to gain the cadastre data from the distributed and heterogeneous database.
从分布异构的地籍数据库提取数据，实现国家地籍数据总归户。
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