论文部分内容阅读
北京是一座历史名城,又是全国政治、文化中心,为了摸清北京市城市绿化现状,给规划、建设、管理工作和研究城市生态提供基础资料,我们使用1983年5月拍摄的1:2千天然彩色航空象片,成功、准确地绘制了北京市规划市区750平方公里范围内的树木、绿地分布图,计算了绿化覆盖率;并在工作中摸索出了一套简便易行、适合我国国情的工作方法。 一、调查的内容及精度要求 了解城市绿地状况的主要目的,是为了规划城市绿化和研究城市生态。因此,图件和数据要有一定精度,要求图件能反映出每一棵树木和每一块草坪或其它植被覆盖的地方;要便于计算任何一块用地上的绿化覆盖面积。同时,城市生态的研究又要求较详细地反
Beijing is a historic city and a national political and cultural center. In order to find out the status quo of urban afforestation in Beijing and provide basic information for planning, construction and management of urban ecology and urban ecology, we use 1: 2 thousand Natural color aviation images, successful and accurate drawing of Beijing’s urban planning within 750 square kilometers of trees, green distribution map, calculated the green coverage rate; and worked out a set of simple and easy, suitable for our country National conditions of the working methods. First, the contents of the survey and the accuracy requirements Understand the main purpose of the status of urban green space, is to plan the urban greening and the study of urban ecology. Therefore, the drawings and data should be of a certain precision. The drawings are required to reflect the coverage of each tree and each lawn or other vegetation; it is convenient to calculate the green coverage of any piece of land. In the meantime, the study of urban ecology has required more detailed countermeasures