Mapping without the sun

zhang, jixian

Bibliographic data

Monograph

Persistent identifier:: 856578517

Author:: Zhang, Jixian

Title:: Mapping without the sun

Sub title:: techniques and applications of optical and SAR imagery fusion ; Chengdu, China, 25 - 27 September 2007

Scope:: 1 Online-Ressource (III, 352 Seiten)

Year of publication:: 2007

Place of publication:: Lemmer

Publisher of the original:: GITC

Identifier (digital):: 856578517

Illustration:: Illustrationen, Diagramme, Karten

Language:: English

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: RESEARCH ON THE PROCESS OF LAND USE/COVER CHANGE IN THREE GORGES RESERVOIR AREA IN RECENT 30 YEARS. SHAO Huai-Yong, XIAN Wei, LIU Xue-Mei, YANG Wu-Nian

Document type:: Monograph

Structure type:: Chapter

241 woodlands; 1986-2000, the order would become construction, lawn, unused land, farmland, woodland, water. From 2 periods of the changes, all the type of comprehensive dynamic content increased. ©The state index: in 1972-1986, the state index of construction land and farmland is closer to -1.00. It illustrated the input speed was big than the output speed of this two categories, internal two-way conversion have large area to turn out very few but very unbalanced states. The state index of Waters, woodland and undeveloped land was larger, were 0 .97,0.83 and 0.76. Note that the output speed of the three kinds of categories is much larger than the input speed, size reduction, in the "cuts" state; Grassland index for the state was 0.56, in a relatively unbalanced state, and the output speed was bigger than input speed. 1986-2000, construction sites than the output speed, extreme "expansion" state; Grassland index for the state was -0.38, describing its input speed was faster than output speed. Although lawn state of absolute index was small, its input speed and output speed was large, the internal two-way conversion obvious. In the State index greater than zero, the state index of unused land was close to 1.00. Note the output speed was bigger than input speed, many areas of the category turned into other categories; the state index of waters is 0.46, Note the output speed was bigger than input speed, which was the relative imbalance in the state; the state index of woodland and farmland were 0.16 and 0.18, closer to zero, the output speed was slightly bigger than the input speed, but both the two speeds were large, the internal two-way conversion Obviously, which was based on the t high turn in and turn out the circumstances of a state of equilibrium. 4. ANALYSIS OF LAND USE / COVER DRIVING CHANGE FORCE IN THREE GORGES RESERVOIR AREA AT NEARLY 30 YEARS Land use / cover dynamically change of Three Gorges reservoir area affected by the natural elements and human factors at nearly 30 years. Policy, economic development, population and other human factors play a leading role, while climate, soil, topography and other natural elements were the minor. Following is the lead role of human factors analysis. 4.1 policy-driven Nearly 30 years, the land use / cover change of Three Gorges reservoir area relatived with major national macro-policies. 1970s to the 1980s, large-scale irrigation and water conservancy basically completed, and, since the 1950s and 1960s large clearing, So in this time suitable for cultivation in the region have decreased, reducing land clearing, the farmland area increased to slow down; After the 1980s countries have implemented the upper reaches of the Yangtze River Water Conservation Forest, upper reaches of the Yangtze River Protection Project and the returning farmland to forest or grassland Project, the cultivated land on steep slopes of Three Gorges reservoir was part returned into woodland and grassland, the destruct of woodland and grassland were in a certain degree kept within limits; Meanwhile the mid-1990s after the progress of the Three Gorges Project is the most tense five years, the dam closure, the river closure, resettlement and urban relocation to varying degrees, causing a decrease in the amount of farmland. 4.2 Economic development driven Three Gorges reservoir area is agricultural, 70's to the 80's as well as destroyed forest and wasteland in order to develop economic, But more appropriate or suitable for the cultivation of land has been rare, so 70's to the 80's cultivated area increasing trend towards relaxation; the late 1980s to the late 1990s,with the economic development, people farming technology continues improved, also people began to understand improve farming land is not the only means of income, this means the use of farmland started increasing diversification, factories and construction sites of the increase was the main way. After the 1980s, particularly in 1997 after the establishment of Chongqing municipality, with Three Gorges reservoir area's rapid economic development, a large number of high quality arable lands were occupied for construction projects. 4.3 Population growth drives The infection of population in the land use / cover change performs the change of the increase or minus in population lead to less food, clothing, shelter, transportation needs, population has been growing was one of the major pressure in regional sustainable development process, the conflict of high population density and the lack of per capita cultivated land of the Three Gorges reservoir area had become more prominent. 70's to the mid-80, population increased, but the amount of land reclamation reduced, One can only cultivated at steep, but the growth rate slowed significantly; 1980s to 2000, construction sites have become increasing rapidly. The areas of cultivated land were occupied continue increased. Nearly 30 years, the population growth of reservoir was the important reason of the construction increasing sustained, rapid. 5. RECOMMENDATION Analyzing the land use / cover changing of Three Gorges reservoir area from the mid-1970's to the end of last century ,nearly 30 years , could found that the reservoir quality of the ecological environment in urgent need of improvement. However, the ecological environment restoration and reconstruction has a long way to go, ensuring the upper reaches of the Yangtze River land sustainable use of resources, quickening the pace of the ecological environment restoration and reconstruction, given the following recommendations: (1) People should control the size of the population and improve the quality of population, develop the economy of the reservoir area. Three Gorges reservoir area had many people on too little land, coupling with the construction of the Three Gorges Project reservoir resettlement, Resettling Area returning farmland to forest and grassland in the implementation of the project, the obvious contradiction between people and land, for all the factors above should strictly control the size of the population; while the low quality of the population have resulted in a lack of backward technology, production methods primitive, the value of the ecological environment of ignorance for the development of chaos, extensive development, which should vigorously improve the quality of the population; In addition to the destruction of the ecological environment is largely caused by poverty, only to solve the problem of poverty in order to restore the ecological virtuous circle. (2) Scientific planning of urban construction, strictly control urban land. No one-sided pursuit of "high, and new and comprehensive", resulting in the building of things on too much, wasting a lot of land resources, This requirement will be strictly in accordance with the relevant regulations, strictly control the

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