Information System City and Environment (ISU50) — Area Reference 1990 (Environmental Atlas)

Physical data of the spatial reference system in scale 1: 50,000 for data from the Environmental Atlas from statistical blocks of the Regional Reference System (RBS) with sub-blocks of the City and Environment Information System (ISU), as at 31.12.1990.截至1990年12月31日的1:5万比例尺空间参考系统物理数据集，其数据来源于区域参考系统（Regional Reference System, RBS）统计区块的环境地图集数据，且附带城市与环境信息系统（City and Environment Information System, ISU）的子区块信息。