Tropical Wetland (TropWet) Mapping Tool: The Automatic Detection of Open and Vegetated Waterbodies in Google Earth Engine for Tropical Wetlands
Tropical Wetland (TropWet) Mapping Tool: The Automatic Detection of Open and Vegetated Waterbodies in Google Earth Engine for Tropical Wetlands
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DOI：
10.3390/rs12071182
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发表时间：
2020-04-01
期刊：
影响因子：
5
通讯作者：
Ettritch, Georgina
中科院分区：
文献类型：
--
作者：
Hardy, Andy;Oakes, Gregory;Ettritch, Georgina
了解地表水和淹没植被的位置和范围对于一系列应用至关重要，包括洪水风险管理，生物多样性监测，量化温室气体排放和绘制水传播疾病风险。在这里，我们提出了一个新的工具，TropWet，它使用户的所有能力，在草本植物为主的地区的基础上简单的解混光学Landsat卫星图像在谷歌地球引擎的湿地地图。结果表明，在整个非洲大陆的可转移性与高度的准确性（平均91%的准确性，标准差2.6%，n = 10,800）。TropWet在绘制博茨瓦纳奥卡万戈等重要湿地的范围方面，比现有的全球可用地表水数据集有了相当大的改进。TropWet能够提供频率淹没地图作为疟疾蚊子水生栖息地的范围和持久性的指标在巴洛特塞兰，赞比亚。TropWet能够绘制洪水范围，与纳米比亚赞比西河地区的业务洪水风险测绘产品相当。最后，TropWet能够量化厄尔尼诺/南方涛动（ENSO）事件对南部非洲光合植被和湿地范围的影响。这些例子表明，TropWet有可能为决策者提供关键信息，帮助他们在国家、区域或大陆范围内做出有关湿地保护、洪水/疾病危害绘图或减轻ENSO影响的决策。
Knowledge of the location and extent of surface water and inundated vegetation is vital for a range of applications including flood risk management, biodiversity monitoring, quantifying greenhouse gas emissions, and mapping water-borne disease risk. Here, we present a new tool, TropWet, which enables users of all abilities to map wetlands in herbaceous dominated regions based on simple unmixing of optical Landsat satellite imagery in the Google Earth Engine. The results demonstrate transferability throughout the African continent with a high degree of accuracy (mean 91% accuracy, st. dev 2.6%, n = 10,800). TropWet demonstrated considerable improvements over existing globally available surface water datasets for mapping the extent of important wetlands like the Okavango, Botswana. TropWet was able to provide frequency inundation maps as an indicator of malarial mosquito aquatic habitat extent and persistence in Barotseland, Zambia. TropWet was able to map flood extent comparable to operational flood risk mapping products in the Zambezi Region, Namibia. Finally, TropWet was able to quantify the effects of the El Nino/Southern Oscillation (ENSO) events on the extent of photosynthetic vegetation and wetland extent across Southern Africa. These examples demonstrate the potential for TropWet to provide policy makers with crucial information to help make national, regional, or continental scale decisions regarding wetland conservation, flood/disease hazard mapping, or mitigation against the impacts of ENSO.