He Yinghong,Zheng Yuchen,Cheng Juan, et al. Zhang Wenyu,Wang Yinqi,Song Jiayao, et al.Research on logarithmic ratio k aerosol extinction using lidar.Plateau Meteorology,2008,27(5):10831087. Stable analytical inversion solution for processing lidar returns. Study on relationship between extinction coefficient and mass concentration.Acta Optica Sinica,2008,28(9):16551658. Han Daowen, Liu Wenqing, Liu Jianguo ,et al.Retrieval method for aerosol mass concentration vertical .Lasers,2006,33(11):15671572. Hu Huanling,Wu Yonghua, Xie Chenbo, et al.Aerosol pollutant boundary layer measured by lidar at Beijing.Research of Environmental Science, 2004, 17(1):5973. Theoretical analysis of laser remote sensing sentiment on the dust mass concentration.Acta Scientiae Circumstantiae,1982,2(1):3643. It also is suggested that more core green spaces be built, such as ecological country parks, to increase the ratio of woodlands, enhance the management of ecological spaces in suburban areas, establish ecologic greenways, and strengthen the connectivity of green spaces.Routine tests were conducted by using RamanMie lidar in the northern suburb of Nanjing.Through the analysis of the lidar echo sinal,aerosol mass concentration profile was inversed with the aid of aerosol mass concentration of linear model and exponential model.In order to improve the accuracy of the inversion,first of all,the Mie scattering signal near field was corrected,eliminating the influence of overlap factor.And denoising methods were used to deal with Raman scattering signal such as wavelet analysis.Secondly the Mie scattering signal was used to inverse the 0~3 km atmospheric aerosol mass concentration,the Raman scattering signal was used to inverse the 3 km~10 km atmospheric aerosol mass concentration,and then the two signals were spliced.Experimental results show that the correlation coefficient of aerosol mass concentration in different time is 0.991 and 0.973 6 inversed with two kinds of models, which is reliable. In order to improve the ecological quality here, both recreational and ecologic functions of green space should be considered during the phases of spatial planning. This is expected to rapidly lower the ecological quality of the region’s green spaces. The amount of farmland, however, is continuously decreasing, as the land is being used in the ongoing urban development. A large proportion of Nanjing’s green space comprises farmlands, primarily distributed on the outskirts of the city and in the suburbs. Green space within the urban area is highly centralized around the Zijin Mountain woodlands, while green space in the suburbs is highly dispersed and fragmented. Results of the study reveal that the distribution of urban green spaces in Nanjing is highly uneven, with most located in suburban areas and few within the city’s core. This study uses ALOS (Advanced Land Observing Satellite) remote-sensing image data to map the distribution of urban green spaces in Nanjing, and employs various landscape metrics to analyze and evaluate the city’s spatial layout and ecological quality. An ecological quality assessment of Nanjing’s green spaces is fundamentally significant to appropriate spatial planning and the implementation of sustainable development ideas. Ecological quality assessment of urban green spaces based on landscape metrics: A case of Nanjing, ChinaĬOMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12A) 384-391Ĭollege of Landscape Architecture, Nanjing Forestry University, Nanjing, ChinaĬhina’s ongoing urbanization is having a profound effect on the environment, and Nanjing, as one of the most important metropolitan areas of the city cluster in China’s Yangtze River Delta, is not immune to this development as such, it is greatly affecting the scale and structure of its urban green spaces.
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