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Land cover/Land uses
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Remote Sensing in Guangzhou area
- Natural resource research: 5 results have been gained. The current status quality, quantity and distribution of surface water, land, soil, vegetation, and economic forest and fruit orchards in the area were ascertained.
Water use in the city mainly depends on surface water. The area was divided into 12 parts in two types: hilly area and plain, by means of combining remote sensing data with common ones. After his quality and quality of water sources in all part have been assessed, map of surface water resources compiled. We think that the main problem in water supply is to control water pollution.
There are plenty of economic forest and fruit resources in Guangzhou and its suburbs. They consist of an important part in urban economic ecosystem. Economic forests and fruit orchards (such as banana pineapple) are divided) are divided into 51 types and the investigation has been conducted. A plan for developing economic forests in urban and suburban areas has been put forward. The investigation and assessment of land resources have been done on the basis of a series of remoter sensing mapping. The land resources of Guangzhou are classified and interpretated in detailed based on the current status of land use and many maps of soil, geomorphology, vegetation, geology as the basic data. Based on the type, nature, characteristics and value, the land resources was divided into 3 degrees, 4 classes and 16 types, thus, providing a basis for city planning and rational use of land. Through the monographic researches of natural resources, a lot of valuable suggestions have been made for current production and constructions, which produce considerable social and economic benefits such as the rational use and protection of water resources, fruit tree planting project, rational utilization of land resources, adjusting the proportion of land use in industry and commerce, full use of wasteland and so on.
- Research on urban environment quality: This program covers the pollution of water body, atmosphere and solid wastes, which affect the urban environment quality. Remote Sensing images, especially natural and infrared color images, have been proved to be obviously effective in these fields. Correlative analysis between images and pollution spectral data together with conventional monitoring data measured on the ground at the same time, detailed interpretation has been made to pollution of water body, atmosphere, pollution source and solid wastes. The different pollution factors have been indicated and a mp of various pollution degrees has also been compiled. It is the first time to make clear the degrees and distributions of the pearl River pollution, other water bodies, and atmosphere, the distributions of solid wastes and their influences on environmental quality. A reliable basis is provided to administer urban environment.
Through interpretation of remote sensing images we have found some pollution sources and their relevant pollution fields which could not be picked out by conventional monitoring methods in the past. It is also possible to trace and monitor the spreading of polluted water mass, which displays clearly in the images.
- Remote Sensing mapping: Based on various monographic researches, 27 monographic maps have been compiled and some of them provided for the first time to some relevant departments and offices. These maps have satisfied the urgent needs of urban planning, construction and management in time.
The initial topographic maps on different scales produced before 70's are hard to meet the demands of planning and management of Guangzhou as the city construction developed too rapidly in the past then years. For this purpose we used the Remote sensing information and the previous status data to modify and compile the urban maps on 1:10,000, 1:12,000 and a:50,000 scales, and compiled black and white image streets, Atlas on 1:50,000 scales. The Remote mpa on 1:20,000 scale and image maps of some areas from 1:500 to 1:500 to 1:500 to scales. The Remote Sensing data has not only met the urgent needs of monographic researches and city management but supplied extensive use to many fields of society. More than 100 units have used these results and great social, economic and environmental benefits have been achieved. In comparison with conventional surveys, the remote sensing has saved 50% funds and 50-80% time.
Conclusion
Generally, a city is a big synthetically system with multiple factors and complex structures. In order to make a good urban planning and management, the collection of basic data must be conducted in time. Conventional measurements require too much time and work to satisfy very urgent needs. This synthetical survey of remote sensing has played its full advantages of high speed, macroscope, high efficiency and it formed multi-subjects investigation and systematic engineering of urban remote sensing. It is helpful for multisubjects to permeate among them and gather scattered data in different units to be processed and applied. At last the results, in the form of detailed classification and accurate data, has become a basis for the scientific planning of city construction. The remote sensing research, with its plenty of results and benefits, has proved to posses a powerful potentiality in urban construction. Remote Sensing as a new techique in information acquisition combined with the application of computers will constitute an important part of an urban information system and play a major role in modernizing urban planning and management.
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