The Global Mangrove WatchA New 2010 Global Baseline of Mangrove Extent
The Global Mangrove WatchA New 2010 Global Baseline of Mangrove Extent
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DOI：
10.3390/rs10101669
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发表时间：
2018-10-01
期刊：
影响因子：
5
通讯作者：
Finlayson, C. Max
中科院分区：
文献类型：
--
作者：
Bunting, Pete;Rosenqvist, Ake;Finlayson, C. Max
这项研究提出了2010年红树林覆盖范围的新的全球基线，并已作为全球红树林观察倡议的第一项产出发布。这是第一项采用全球一致的自动化方法绘制红树林地图的研究，确定全球范围为137 600平方公里。使用分布在全球20个地点的53，878个准确点，红树林范围的总体准确度为94.0%，真实值在93.6- 94.5%之间的可能性为99%。根据《拉姆萨尔湿地公约》的地理区域，亚洲的红树林比例最高，占全球总数的38.7%，拉丁美洲和加勒比地区占20.3%，非洲占20.0%，大洋洲占11.9%，北美占8.4%，欧洲海外领土占0.7%。所制定的方法主要基于ALOS PALSAR和大地卫星传感器数据的分类，首先生成生境掩模，其中使用极端随机树分类器对红树林进行分类。这一新的全球一致基线还将构成红树林监测系统的基础，该系统利用日本宇宙航空研究开发机构JERS-1合成孔径雷达、ALOS PALSAR和ALOS-2 PALSAR-2雷达数据评估1996年至今的红树林变化。然而，在使用该产品时，用户应注意到，建议最小绘图单位为1公顷，在干扰地区和存在红树林狭窄地带或较小的破碎地区，误差会增加。在某些地区，特别是在西非地区，由于缺乏Landsat-5数据和持续性云层覆盖，也存在由云层覆盖和Landsat-7 SLC关闭误差造成的人为现象。今后将考虑根据10米Sentinel-2复合材料制作新的全球基线。
This study presents a new global baseline of mangrove extent for 2010 and has been released as the first output of the Global Mangrove Watch (GMW) initiative. This is the first study to apply a globally consistent and automated method for mapping mangroves, identifying a global extent of 137,600 km2. The overall accuracy for mangrove extent was 94.0% with a 99% likelihood that the true value is between 93.6-94.5%, using 53,878 accuracy points across 20 sites distributed globally. Using the geographic regions of the Ramsar Convention on Wetlands, Asia has the highest proportion of mangroves with 38.7% of the global total, while Latin America and the Caribbean have 20.3%, Africa has 20.0%, Oceania has 11.9%, North America has 8.4% and the European Overseas Territories have 0.7%. The methodology developed is primarily based on the classification of ALOS PALSAR and Landsat sensor data, where a habitat mask was first generated, within which the classification of mangrove was undertaken using the Extremely Randomized Trees classifier. This new globally consistent baseline will also form the basis of a mangrove monitoring system using JAXA JERS-1 SAR, ALOS PALSAR and ALOS-2 PALSAR-2 radar data to assess mangrove change from 1996 to the present. However, when using the product, users should note that a minimum mapping unit of 1 ha is recommended and that the error increases in regions of disturbance and where narrow strips or smaller fragmented areas of mangroves are present. Artefacts due to cloud cover and the Landsat-7 SLC-off error are also present in some areas, particularly regions of West Africa due to the lack of Landsat-5 data and persistence cloud cover. In the future, consideration will be given to the production of a new global baseline based on 10 m Sentinel-2 composites.