Building Footprints

These footprint extents are collapsed from an earlier 3D building model provided by Pictometry of 2010, and have been refined from a version of building masses...本批建筑基底范围数据源自Pictometry公司2010年提供的早期三维建筑模型，经坍缩处理提取得到，并基于某一版本的建筑体量数据集完成了精细化优化……