本报讯 记者陆伟军 陈方敏报道 上海市内环以内120平方千米的三维城市模型，近日由上海市测绘院建成（如图）。三维城市模型是一种能给人三维直观感受的地理模型，在安全保卫、应急服务、城市规划、土地利用、公用管理、电子商务等领域具有广泛的应用前景。
由于上海中心城区建筑密集，地形复杂，一直是三维建模的重点和难点。基于中心城区各区域性质和重要性的不同，上海院在本次模型制作中采用了简单模型、标准模型、精细模型和超精细模型四种方法。各类模型要素包括建筑物及其附属设施、高架、桥梁、桥墩、广告牌、书报亭等。例如将居民区制作为标准模型，将地标性区域制作为精细模型或者超精细模型。此外，还分别对南京路步行街、豫园、徐家汇商圈、人民广场和外滩等热点区域制作了超精细小场景。
PRC, Shanghai's Lu Weijun Chen Fang reported that the inner ring within the 120 square kilometer 3D city models, recently built by the Shanghai Surveying and Mapping Institute (pictured). 3D city model is a three-dimensional visual experience give people the geographic model, security, emergency services, urban planning, land use, public management, e-commerce and other fields a wide range of application prospects.
As the Shanghai downtown construction-intensive, complex terrain, has been the focus of three-dimensional modeling and difficult. Based on the nature of downtown and the importance of regional differences, the Shanghai Institute produced in this model used a simple model, the standard model, fine and super fine models model of four methods. Various types of model elements, including buildings and their ancillary facilities, overhead, bridges, piers, billboards, kiosks and other books. Such as residential areas as a standard production model, the landmark for the fine model of regional production, or ultra-fine model. In addition, each of the Nanjing Road Pedestrian Street, Yuyuan Garden, Xujiahui shopping district, People's Square and the Bund and other hot regions has produced a super fine little scene.
