Monitoring urban greenness dynamics using multiple endmember spectral mixture analysis.
Monitoring urban greenness dynamics using multiple endmember spectral mixture analysis.
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DOI：
10.1371/journal.pone.0112202
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Wang K
中科院分区：
文献类型：
--
作者：
Gan M;Deng J;Zheng X;Hong Y;Wang K
城市绿化日益被视为城市环境的一个重要组成部分，可以提供一系列服务，提高居民的生活质量。了解城市绿地的格局及其时空动态变化规律，将为城市规划提供有价值的信息。本文利用1990年、2002年和2010年的Landsat-5 TM时间序列数据，对杭州市近20年来的城市绿地格局进行了研究。多个端元光谱混合分析被用来获得植被覆盖度在亚像素水平。一个RGB植被覆盖度模型，变化强度分析和同心圆技术相结合，揭示了详细的，空间特征和整体格局的变化，植被覆盖度。我们的研究结果表明，多个端元光谱混合分析的能力，准确地模拟像素的植被覆盖率，尽管复杂的光谱混淆不同的土地覆盖类型。多种技术的整合揭示了该地区城市绿化的各种变化模式。在过去的二十年里，整体植被覆盖率急剧下降，而所研究的景点没有发生显着变化。与此同时，现有市区的绿化情况亦显著恢复。小块绿色斑块覆盖率的增加对城市绿色的恢复起着至关重要的作用。这些变化模式在2002 - 2010年期间比1990 - 2002年期间更加明显，它们揭示了快速城市化和绿化政策的综合影响。这项工作表明，时间序列的植被覆盖率进行准确和深入的研究，城市绿化的长期轨迹，以获得有意义的信息，可持续的城市发展的有用性。
Urban greenness is increasingly recognized as an essential constituent of the urban environment and can provide a range of services and enhance residents’ quality of life. Understanding the pattern of urban greenness and exploring its spatiotemporal dynamics would contribute valuable information for urban planning. In this paper, we investigated the pattern of urban greenness in Hangzhou, China, over the past two decades using time series Landsat-5 TM data obtained in 1990, 2002, and 2010. Multiple endmember spectral mixture analysis was used to derive vegetation cover fractions at the subpixel level. An RGB-vegetation fraction model, change intensity analysis and the concentric technique were integrated to reveal the detailed, spatial characteristics and the overall pattern of change in the vegetation cover fraction. Our results demonstrated the ability of multiple endmember spectral mixture analysis to accurately model the vegetation cover fraction in pixels despite the complex spectral confusion of different land cover types. The integration of multiple techniques revealed various changing patterns in urban greenness in this region. The overall vegetation cover has exhibited a drastic decrease over the past two decades, while no significant change occurred in the scenic spots that were studied. Meanwhile, a remarkable recovery of greenness was observed in the existing urban area. The increasing coverage of small green patches has played a vital role in the recovery of urban greenness. These changing patterns were more obvious during the period from 2002 to 2010 than from 1990 to 2002, and they revealed the combined effects of rapid urbanization and greening policies. This work demonstrates the usefulness of time series of vegetation cover fractions for conducting accurate and in-depth studies of the long-term trajectories of urban greenness to obtain meaningful information for sustainable urban development.
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