Application of Remote Sensing Technique in Taiyuan Municipal Enivironment Survey
Huo Yu lin, Dong Yu yang
Shanxi Remote Sensing Centre, Taiyuan, China
Abstract
As basic from of the space structure of human society, cities occupy an extremely important position in the development of social economy and history. In order to probe the scientific method of applying the remote sensing technique to the municipal environment survey as well as open up the service area of the remote sensing technique, a sythetical survey of municipal environment was carried out in Taiyuan district during the period of 1987 to 1989 which has yielded results in 28 items covering 8 fields . The data acquired through the investigation on Taiyuan’s background and status provides a decision making for the municipal management and plan.
Introduction
Taiyuan as the centre of Shanxi, China’s base of energy resources and chemical industries, boasts a natural deposit and highly developed mining trade. In 1949 Taiyuan was no bigger than 30.11km2 with a population of only 210,000 though it had a long history of over one thousand years. Great changes took place during the last forty years. In 1980 , taiyuan was up to a size of 133.63 km2 while its population became 1.14 million. Owing to the lack of water resources, and the serious environmental pollution, it becomes an important problem for the government in decision making as to how to control the development scale, exploit and utilize land and resources. The data acquired through common technical method prove to be not quite reliable partly because of the long period, and partly the differences in synchronization and comparability. With a view of raising the scientific level in municipal planning management and decision-making, Shanxi provincial government decided in 1987 to carry out a municipal environment remote sensing survey in Taiyuan.
Technical Method
1. Design of the Survey
According to the characteristic of the city, the survey should include background factors as regional geological structure, mineral resources, water resources disaster liability, environmental
temperature field, and present situation as land utilization, building distribution, functional layout greenage ccoverage, environment pollution, tendency of development,...etc. The design and of the multipurpose investigation concemed scale,timephase , resolve rate and spectrum wave band of remote sensing data; Standard of classification, data precision, statistic model and map formation requirement of various essential factors.
2. Acquisition of Data
The scope of surveying for background study is comparatively wider. The Land sat 5 TM data and NOAA 9,10 thermal infrared data prove to be appropriate. For present situation survey, the colour infrared ray, multispectrum, panchromatic black and white aerial photo, scales between 1/3800 and 1/50000, are selected. To study the evolution of a city aerialphotos of different time phases and the corresponding ground data are also used. For accuracy’s sake, also collected are topographic maps of corresponding scales, municipal overall plan, construction norm, statistic almanac and observation data from various stations.
