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Urban land use change of Guangzhou, South China, using multiple temporal satellite images

From official report, the urbanization level of China has increased from 22% in 1983 to 33% in 1999. Rapid urbanization therefore brings opportunities to new urban developments, however, it also brought about serious losses of arable land. Guangzhou, a mega city in south China, located in the Pearl River delta, a window of the implementation of reform and open policy in China, particularly, belongs to this situation. Analysis of land use change in Guangzhou urban area was based on Landsat TM/ETM imagery (Scene No. 122-44) in December 1988 and January 2000, respectively. This was followed by geometric correction and geo-reference of the images using digital topographical maps with a scale of 1:100,000 with IMAGINE ERDAS software. Then the images were classified by supervised classification method and a system of land use classification was established in which land use was grouped into seven categories (fishing ponds, urban built-up area, stand-alone industrial and development zones, rural settlement, other non-agricultural land, agricultural land, and water surface). For land whose use cannot be determined correctly, classification was done after documentary research and ground truth verification. The grouped pixels were given numerical identification according to the results of images classification. The results showed that, the agriculture land decreases dramatically, whereas the urban built-up area in 2000 is more than two times that in 1988, industrial/development zones nearly five times, fishing ponds nearly six times. As a result, from 1988 to 2000, Guangzhou city has a significant expansion, at the same time, it lost a great quantity of fertile agriculture land.