Remote Sensing in Guangzhou area
Lin Shuyu
Institute of Geological Science of Guangdong
Guan Liji
Remote Sensing Centre of ZhongShan University,
Guang Zhou
China
Abstact
Remote Sensing in Guangzhou area is a big project and covers many subjects of applied techniques. The construction conditions, natural resources, environment, geology and geomorphology in Guang Zhou are has been investigated by means of Aero-remote Sensing method in order to meet the rapid development of the urban area. The results are studied together with previous ground data. We have analyzed some existent problems on the basis of multi-subjects investigation. Meanwhile we have provided various maps to some social departments, and solved many problems in planning small areas and important engineering. The numbers of users of these results are at present more than one hundred. Thus Remote Sensing in Guangzhou area has produced a great influence with its rich results and good effectiveness.
Introduction
In recent years with the rapid economic development, Guangzhou city is facing some serious problems urban expanding, population increasing, farmland decreasing, traffic Jams, lack of power, reconstruction of the city and so on. In order to solve these problems properly, comprehensive scientific data are need to support overall planning. Hereby we have adopted modern technique to collect data as the previous ones are too old and too incomplete to be used. Consequently a bit multi-diplomacy and comprehensive project of remote sensing has been carried out.
Under the leadership of the municipal government, about 15 organizations and 140 technicians, have worked together for more than 2 years and have made a great a achievement. After systematic and scientific study of the results, we have made some suggestions of city construction and management to the related units, thus laying down a solid basis for the establishment of an urban information system.
We must know completely the history, the present status, the future trend of urban factors in order to solve the problems which have popped up in recent years and propose reasonable planning and management. We, in close cooperation with planning -departments, have discussed and expounded 31 monographic items such as urban construction status, natural resources, gology and geomorphology, environmental pollution and remote sensing mapping, etc. According to the requirements of the project, we have carried out color infrared photography (1:20,000), natural color photography (1:10,000) and black/white visible photograph 91:15,000) . The accuracy of every monographic item (including qualitative classification, quantitative statistics and mapping scale) has a good correlation with the specifications set by users and planning departments.
Main rsults and benefits:
- The current status of city construction including land use, distributions of architectural density and light, banks use of Pearl River, greenery cover, traffic and urban development were surveyed in detail with Aero-Remote Sensing.
We classified the land use of Guangzhou into 3 grades and 58 types based on its characteristics and need of city planning and construction. With a plotter A 10 and remote sensing data, the map of land use on scale 1:10,000 was drawn up and the land area of various types was calculated too. We have also analyzed the distributive characteristics, the proportion and other existing problems of land use.
The Pearl River and its banks within the city are an important area of economic development; we investigated the current status of banks use and found some unreasonable phenomena. Some suggestions to improve administration were made.
In the past, there was no exact data to show its high population density, high architectural density and serious traffic jams. With the remote sensing images of different dates and scales we have investigated they thus obtained the first completed data. With aero photographs on large scale of different dates we analyzed the Vehicular discharge and density on main streets and drew up their distributive charts. This is the basic data we have provided for the traffic control managements.
In addition, we have also investigated in detail the greenery quality, type and cover-degree in Guangzhou area, with Remote sensing images on 1:5,000 and provided the information on detailed, systematic and exact greenery status.
In order to know completely and systematically the construction status of different time, we compiled some maps of land use with aero photographs of 60's, 70's 80's (3 periods).And we compared the quantity, distribution, structural changes of land use in different time, nature and types, These would produce some reliable evidences for overall planning, adjusting development and making a local detailed plan.
