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Remote Sensing for Land & Resources    2018, Vol. 30 Issue (1) : 102-108     DOI: 10.6046/gtzyyg.2018.01.14
Orginal Article |
Evaluation of land cover and ecological change of Yongding Hakka Tulou World Heritage Protection Area using remote sensing image
Zhigang XU1,2,3(), Hongrui ZHENG1,3, Chenxi DAI1,3, Peng GAO2, Peijun DU1,3()
1. Key Laboratory for Satellite Mapping Technology and Applications of State Administration of Surveying, Mapping, and Geoinformation of China, Nanjing University, Nanjing 210023, China
2. Institute of Resource Engineering,Longyan University, Longyan 364012, China
3. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China
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Abstract  

In this paper, Yongding District, where there are World Heritage Hakka Tulou and its Conservation Plan Area(Hugao region), were taken as the study area. With the purpose of analyzing the land cover and ecological environment changes in the study area from 1988 to 2014, the authors selected five Landsat images acquired in 1988, 1996, 2002, 2009, 2014 respectively to generate the land cover classification maps by using multiple classifier system and the remote sensing based ecological index (RSEI)maps by using RSEI. The change of land cover and ecological environment in the study area was obtained by the method of post classification change detection. Some conclusions have been reached: ① The land cover of the study area significantly changed during the 26 years from 1988 to 2014, and the forest, shrub and grassland and built-up land increased rapidly, while farmland, degraded land and cultivation land decreased considerably; ② RSEI is suitable for the evaluation of the ecological environment of the World Heritage Hakka Tulou; ③ The overall ecological quality of the two study areas improved year by year except for the period of 1988―1996; ④ The relationship between the land cover and the ecological environment revealed that the ecological quality improved in the degraded land at high-altitude,the slope farmland which was converted into the forest land, shrub and grassland, and became worse in the area of forest, shrub and grassland land which degraded into the area of farmland, the degraded land and the reclaimed land as well as the expansion area surrounding the urban district.
Keywords Hakka Tulou      World Cultural Heritage      land cover change      remote sensing based ecological index (RSEI)      remote sensing     
:  TP79  
  TP701  
Issue Date: 08 February 2018
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Zhigang XU
Hongrui ZHENG
Chenxi DAI
Peng GAO
Peijun DU
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Zhigang XU,Hongrui ZHENG,Chenxi DAI, et al. Evaluation of land cover and ecological change of Yongding Hakka Tulou World Heritage Protection Area using remote sensing image[J]. Remote Sensing for Land & Resources, 2018, 30(1): 102-108.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2018.01.14     OR     https://www.gtzyyg.com/EN/Y2018/V30/I1/102
Fig.1  Landsat8 images showing Yongding district and locations of World Heritage of Hakkas Tulou
Fig.2  Land-cover classification maps of Yongding district and Hugao region
分量 计算式 说明
Wet Wet=∑i=16Ciρi ρi以波长递增方式依次为TM/ETM+/OLI的可见光、近红外、短波红外波段反射率; Ci的计算方法见文献[14,15,16]
NDVI NDVI=(ρNIR-ρR)/(ρNIR+ρR) ρNIR和ρR分别为各传感器的近红外及红色波段反射率
NDSI NDSI=(SI+IBI)/2 SI为裸土指数[17],IBI为建筑指数[18]
LST T=K2/ln(K1/L+1);
LST=T/[1+(λT/ρ)lnε]		 K1和K2为定标参数,其具体计算及取值见文献[19]; λ为反演温度的热红外波段的中心波长; ρ=1.438×10-2 m K; ε为比辐射率,其具体计算及取值见文献[20]
Tab.1  Formulas of various index
Fig.3  Area and area change quantities of different land-cover classes in various years in Hugao region
年份 Wet NDVI NDSI LST RSEI
全区 湖高区 全区 湖高区 全区 湖高区 全区 湖高区 全区 湖高区
1988年 分量均值 0.636 0.576 0.700 0.730 0.388 0.425 0.594 0.604 0.615 0.577
对PC1荷载值 0.563 0.550 0.464 0.492 -0.569 -0.585 -0.380 -0.336
1996年 分量均值 0.627 0.546 0.681 0.650 0.427 0.504 0.484 0.567 0.594 0.507
对PC1荷载值 0.512 0.526 0.500 0.495 -0.549 -0.539 -0.432 -0.434
2002年 分量均值 0.630 0.528 0.704 0.626 0.381 0.483 0.499 0.514 0.616 0.507
对PC1荷载值 0.562 0.565 0.441 0.435 -0.572 -0.573 -0.403 -0.405
2009年 分量均值 0.650 0.549 0.725 0.741 0.424 0.511 0.575 0.578 0.634 0.566
对PC1荷载值 0.529 0.545 0.466 0.444 -0.576 -0.577 -0.413 -0.415
2014年 分量均值 0.715 0.654 0.800 0.787 0.343 0.395 0.522 0.423 0.685 0.660
对PC1荷载值 0.522 0.553 0.498 0.474 -0.560 -0.588 -0.408 -0.351
Tab.2  Changes for mean values of four components and RSEI in five years
Fig.4  Images of RSEI change detection in Yongding district and Hugao region
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