关键词: 绿化三维量, 遥感测算模式, 空间定位, 信息管理系统

Abstract: The difference in spatial structure of urban greenery affects the environmental quality to a great extent. Taking the ability of absorbing CO₂ and producing O 2 as an example, the volume the forest produce is about five times as much as that produced by grass of the same size. It can be inferred that the methods of relative analysis often used are not very accurate in some sense. The three dimentional vegetation quantity (hereinafter referred to as “3 D VQ”) is a new concept put forward by the author. The 3 D VQ means the volume of a space occupied by stem and leaves of a plant. Compared with those values concerning plane, the greenery value is the index that demonstrates the differences of urban greenery in spatial organization better. Therefore, it can be applied to calculate the theoretical value of environmental benefit in terms of greenery more accurately. After several years’ research, a series of theories and techniques have been made out. Several major breakthroughs are described as follows: 1. In terms of the method of simulating the stereo quantity by the plane quantity, the remote sensing models of measuring and calculating the 3 D VQ were put forward. With them we surveyed and calculated the 3 D VQ through interpretation of color infrared aerial photos and simulation technology of computer. Especially the “Logistic curve” equation was successfully corrected; as a result, the precision of calculating the 3 D VQ has remarkably been improved. 2. The first database of 3 D VQ has been established. There are several advances in the studies of the theories and techniques of establishing data model and structure and arranging and coding files and data. 3. The 3 D VQ database has been developed into an advanced management system in the general form of GIS. This system has the functions of inquiry, statistics, amendment, charting and establishment of new 3 D VQ database with the basic characters of spatially locating and window appearing. The system can directly serve the consumers of garden department as a macro managemental system for the whole city. It gives a lot of help to make a scientific and automatic management of gardens. It has also provided theoretical and techological basis for some relative analyses between urban greenery and environment for other relative studies.

Key words: three dimentional vegetation quantity, database management system, spatial location, window appearing