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GIS-structured database with polygonal representation of the building extracted from CTRN 5000 with associated building height and volume information. IGM 50000 cut.地理信息系统（GIS）结构化数据库，包含从CTRN 5000中提取的建筑物多边形表示形式，以及关联的建筑物高度与体积信息。 IGM 50000裁剪版。