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纸质出版日期： 2022-02-07 ，
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宁晓刚，常文涛，王浩，张翰超，朱乾德.2022.联合GEE与多源遥感数据的黑龙江流域沼泽湿地信息提取.遥感学报，26（2）： 386-396
Ning X G，Chang W T，Wang H，Zhang H C and Zhu Q D. 2022. Extraction of marsh wetland in Heilongjiang Basin based on GEE and multi-source remote sensing data. National Remote Sensing Bulletin， 26（2）：386-396
湿地是地球上最重要的生态系统之一，在维持全球生态环境安全等方面发挥着举足轻重的作用。由于湿地独特的水文特征，传统的湿地监测需要耗费大量的人力和财力，对于大尺度的湿地信息提取更是困难重重。随着大数据和云计算的兴起，为大尺度和长时间序列的空间数据处理提供了契机。本文基于Google Earth Engine（GEE）云平台，使用Sentinel-1合成孔径雷达（SAR）数据、Sentinel-2光学数据以及地形数据，探讨了红边、雷达以及地形特征对大范围区域沼泽湿地提取的重要性，验证了利用JM距离寻找沼泽湿地提取最优特征组合的可行性，结合随机森林算法对2018年黑龙江流域沼泽湿地进行提取。研究表明：（1）Sentinel-2红边波段和Sentinel-1雷达波段以及地形数据有利于沼泽湿地信息提取，相比植被指数和水体指数沼泽的制图精度分别提高了7.56%，5.04%，4.48%；（2）利用JM距离得到的分离度表明，红边特征>其他光学特征>地形特征>雷达特征。进行特征优选后沼泽湿地的制图和用户精度分别提高了1.45%和3.02%，最终结合随机森林算法的总体精度为91.54%，沼泽的提取精度为88.55%。本研究利用GEE云平台和多源遥感数据以及机器学习算法，能够准确、快速、高效地提取大尺度范围沼泽湿地信息，具有较大的应用潜力。
Wetland is an important ecosystem on the planet and plays a pivotal role in maintaining global ecological environment security. Traditional wetland monitoring requires a lot of manpower and financial resources due to the unique hydrological characteristics of wetlands
and extracting large-scale wetland information is also difficult. Compared with traditional field surveys
remote sensing technology
which has the advantages of wide observation range
short update cycle
has played an important role in large-scale wetland information extraction. However
remote sensing monitoring of march wetland mainly uses optical images traditionally
which are severely affected by weather such as clouds and rain
making large-scale marsh wetland extraction challenging. The use of radar and terrain data can combine the spectral information and scattering mechanism
which has great potential for marsh wetland information extraction. Nevertheless
there are few studies that evaluate the differences of optical
SAR
and topographic features in importance for the extraction of marsh wetland information. The rise of big data and cloud computing has enabled large-scale and long time series spatial data processing. On the basis of the Google Earth Engine (GEE) cloud platform
this study uses Sentinel-1 synthetic aperture radar data
Sentinel-2 optical data
and terrain data to explore their importance to the extraction of marsh wetland at large scale
and verify the feasibility of JM distance to find the optimal feature combination to the extraction of marsh wetland. Random forest algorithm is also used to extract marsh wetlands in Heilongjiang Basin in 2018. In order to explore the importance of red edge
radar and topographic features and the best features conducive to marsh wetland extraction
six experimental schemes are designed. Scheme one uses the combination of spectral feature
vegetation index and water index. Scheme two uses the combination of spectral feature and red edge feature. Scheme three uses the combination of spectral feature and terrain feature. Scheme four uses the combination of spectral feature and radar feature. Scheme five uses the combination of spectral feature
vegetation index
water index
red edge feature
terrain feature and radar feature. Scheme six uses all features
which are optimized by JM distance. The research shows that (1) Sentinel-2 red edge bands and Sentinel-1 radar bands and terrain data are conducive to marsh wetland information extraction. Compared with vegetation indexes and water indexes
the producer accuracy of marsh increased by 7.56%
5.04%
and 4.48%. (2) The separation obtained using JM distance shows that the order is red-edge features > other optical features > terrain features > radar features. The marsh wetland in scheme six has the highest mapping accuracy and user accuracy. After using the JM distance to select features
the producer and user accuracies of the marsh wetland increased by 1.45% and 3.02%
respectively. The overall accuracy of the combined random forest algorithm was 91.54%
and the accuracy of marsh extraction was 88%. This study uses the GEE cloud platform
multisource remote sensing data
and machine learning algorithms to accurately
quickly
and efficiently extract large-scale marsh wetland information. This method has great application potential.
遥感Google Earth Engine沼泽湿地Sentinel-1Sentinel-2JM距离随机森林红边波段
remote sensingGoogle Earth EnginemarshSentinel-1Sentinel-2JM distancerandom forestred-edge bands
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