A discussion on the landscape and the gradually changes of Yunnan Lijiang city based on modern 3S technique

摘要

The ancient Lijiang town is seated in the Lijiang basin embraced by great mountains no less than 3, 000 meters altitude, such as Shanzidou, the Peak of Yulong Snow Mountain in the north with an elevation of 5, 596 meters; the Peak of Wenbi Mountain in the south with an elevation of 3, 465 meters. However, inside the basin, there are some hills, such as the Lion Hill, the Tortoise Hill, the Snake Hill and so on, around the ancient Lijiang town lower than 2, 700 meters altitude. The hills and lakes nearby are important part in the whole landscape of the ancient Lijiang town. Compared with the Yulong Snow Mountain, which is solemn and magnificent showing direct and strong visual impact, those hills and lakes impact on people imperceptibly, showing the city of Lijiang an unique style and artistic conception of the environment. Xu Xiake, the famous geographer in Ming Dynasty, appraised that “those small hills give priority to the mountains all around” after he had traveled Lijiang area. But in recent years, large-scale city construction in the Lijiang basin modernized the ancient town, showing a tendency to destroy those hills and lakes. To enjoy and comment the beautiful sight conveniently, the landscape was restored by using VirtualGIS technology in this paper, using Quickbird, SPOT and ETM remote sensing images texture to the surface annotating on roads, construction, water systems and other information. The information about built-up area of deferent period from 1960s to 2007 was acquired based on multitime remote sensing imagines; the expanding track of Lijiang city and the influence to the world culture heritage were discussed. Also proposed to protect the small hills and lakes in the city construction, which would be new tourist attractions and routes to alleviate tourism pressure on the ancient town of Lijiang and Yulong Snow Mountain.