Analysis Of The Mangrove Structure In The Dong Rui Commune Based On Multispectral Unmanned Aerial Vehicle Image Data

Q2 Agricultural and Biological Sciences Geography, Environment, Sustainability Pub Date : 2024-01-12 DOI:10.24057/2071-9388-2023-2641
D. Ngo, K. N. Quoc, N. T. Dang, C. H. Dang, L. L. Tran, H. Nguyen
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Abstract

Mangroves are one of the most important types of wetlands in coastal areas and perform many different functions. Assessing the structure and function of mangroves is a premise for the management, monitoring and development of this most diverse and vulnerable ecosystem. In this study, the unmanned aerial vehicle (UAV) Phantom 4 Multispectral was used to analyse the structure of a mangrove forest area of approximately 50 hectares in Dong Rui commune, Tien Yen district, Quang Ninh Province – one of the most diverse wetland ecosystems in northern Vietnam. Based on the visual classification method combined with the results of field taxonomic sampling, a mangrove tree classification map was established for UAV with three species, Bruguiera gymnorrhiza, Rhizophora stylosa, and Kandelia obovata, achieving an overall accuracy = 86.28%, corresponding to a Kappa coefficient =0.84. From the images obtained from the UAV, we estimated and developed maps and assessed the difference in tree height and four vegetation indices, including the normalized difference vegetation index (NDVI), green normalized difference vegetation index (GNDVI), enhanced vegetation index (EVI), and green chlorophyll index (GCI), for three mangrove plant species in the flying area. Bruguiera gymnorrhiza and Rhizophora stylosa reach an average height of 4 to 5 m and are distributed mainly in high tide areas. Meanwhile, Kandelia obovata has a lower height (ranging from 2 to 4 m), distributed in low-tide areas, near frequent flows. This study confirms the superiority of UAV with red edge and near-infrared wave bands in classifying and studying mangrove structures in small-scale areas.
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基于多光谱无人机图像数据的东瑞公社红树林结构分析
红树林是沿海地区最重要的湿地类型之一,具有多种不同的功能。评估红树林的结构和功能是管理、监测和发展这一最多样化、最脆弱的生态系统的前提。本研究使用无人飞行器(UAV)Phantom 4 多光谱分析了越南北部最多样化的湿地生态系统之一--广宁省天燕县 Dong Rui 乡约 50 公顷红树林的结构。根据视觉分类法结合实地分类采样结果,为无人机建立了红树林分类图,其中包括三个物种:Bruguiera gymnorrhiza、Rhizophora stylosa 和 Kandelia obovata,总体准确率达到 86.28%,对应的 Kappa 系数为 0.84。根据无人机获取的图像,我们估算并绘制了地图,评估了飞行区域内三种红树林植物的树高差异和四种植被指数,包括归一化差异植被指数(NDVI)、绿色归一化差异植被指数(GNDVI)、增强植被指数(EVI)和绿色叶绿素指数(GCI)。Bruguiera gymnorrhiza 和 Rhizophora stylosa 的平均高度为 4 至 5 米,主要分布在高潮区。而 Kandelia obovata 的高度较低(2 至 4 米),分布在低潮区和水流频繁的附近。这项研究证实了无人机的红边波段和近红外波段在对小规模地区的红树林结构进行分类和研究方面的优越性。
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来源期刊
Geography, Environment, Sustainability
Geography, Environment, Sustainability Social Sciences-Geography, Planning and Development
CiteScore
2.50
自引率
0.00%
发文量
37
审稿时长
12 weeks
期刊介绍: Journal “GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY” is founded by the Faculty of Geography of Lomonosov Moscow State University, The Russian Geographical Society and by the Institute of Geography of RAS. It is the official journal of Russian Geographical Society, and a fully open access journal. Journal “GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY” publishes original, innovative, interdisciplinary and timely research letter articles and concise reviews on studies of the Earth and its environment scientific field. This goal covers a broad spectrum of scientific research areas (physical-, social-, economic-, cultural geography, environmental sciences and sustainable development) and also considers contemporary and widely used research methods, such as geoinformatics, cartography, remote sensing (including from space), geophysics, geochemistry, etc. “GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY” is the only original English-language journal in the field of geography and environmental sciences published in Russia. It is supposed to be an outlet from the Russian-speaking countries to Europe and an inlet from Europe to the Russian-speaking countries regarding environmental and Earth sciences, geography and sustainability. The main sections of the journal are the theory of geography and ecology, the theory of sustainable development, use of natural resources, natural resources assessment, global and regional changes of environment and climate, social-economical geography, ecological regional planning, sustainable regional development, applied aspects of geography and ecology, geoinformatics and ecological cartography, ecological problems of oil and gas sector, nature conservations, health and environment, and education for sustainable development. Articles are freely available to both subscribers and the wider public with permitted reuse.
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