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Temporal and Spatial Changes of the Yellow River Delta Wetland Based on Multi-Source Data During 30 Years

机译:基于30年多源数据的黄河三角洲湿地时空变化

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摘要

Estuary wetlands are important and vulnerable. In order to demonstrate the performance of the imaging data of Wide-band Imaging Spectrometer of Tiangong-2 in wetland classification and detect the changes of the Yellow River Delta wetland, we used object-oriented classification, landscape center of gravity transfer model and landscape index to depict the temporal and spatial changes of the Yellow River Delta wetland in the past 30 years from 1986 to 2016. Landsat 5 TM data in 1986 and imaging data of Wide-band Imaging Spectrometer of Tiangong-2 in 2016, as well as Landsat 8 OLI in 2016, were utilized. The imaging data of Wide-band Imaging Spectrometer of Tiangong-2 was fused with Landsat image by Gram-Schmidt spectral sharpening algorithm for analysis. It shows that: (1) After fusion with the higher resolution image, Tiangong-2 multi-spectral data is helpful for wetland study. (2) The natural wetlands decreased from 2404.24 km~2 in 1986 to 1666.47 km2 in the past 30 years. Human-made wetlands increased from 42.41 km2 in 1986 to 836.58 km~2 in 2016. (3) During the past 30 years, the gravity centers of natural wetlands, human-made wetlands and non-wetlands have been shifting towards the sea respectively. The shifting distance of human-made wetlands was larger. (4) The wetland landscape index indicated that the landscape pattern dominated by natural wetlands tended to be dominated by non-wetlands.
机译:河口湿地很重要,也很脆弱。为了证明天宫二号宽带成像光谱仪的成像数据在湿地分类中的性能并检测黄河三角洲湿地的变化,我们采用了面向对象分类,景观重心转移模型和景观指数描绘了1986年至2016年过去30年中黄河三角洲湿地的时空变化。1986年的Landsat 5 TM数据和2016年的天宫2号宽带成像光谱仪以及Landsat 8的成像数据在2016年使用了OLI。通过Gram-Schmidt光谱锐化算法,将天宫二号宽带成像光谱仪的成像数据与Landsat图像融合在一起进行分析。结果表明:(1)天宫2号多光谱数据与高分辨率图像融合后,对湿地研究有帮助。 (2)自然湿地从1986年的2404.24 km〜2减少到过去30年的1666.47 km2。人工湿地从1986年的42.41 km2增加到2016年的836.58 km〜2。(3)在过去30年中,自然湿地,人工湿地和非湿地的重心分别向海洋转移。人工湿地的移动距离较大。 (4)湿地景观指数表明,以自然湿地为主的景观格局倾向于以非湿地为主。

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