The crowd degree of buildings is a very important aspect for the assessment of environmental quality of urban communities . remote sensing imagery with high spatial resolution provides more detailed spatial information about land covers and makes it possible to assess the quality of communities in detailed scale 居住单元的建筑拥挤度是居住单元环境评价的重要方面，而高分辨率卫星影像所提供的丰富的细节化的空间信息使得从居住单元的尺度研究建筑拥挤度成为可能。
