Evaluation of Multispectral Image for Mangrove Health Assessment Using Sentinel 2A and Field Spectrometer Data

Nirmawana Simarmata, K. Wikantika, S. Darmawan, A. B. Harto, Aki Asmoro Santo
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Abstract

Mangrove health is one of the parameters to show the quality of mangrove forest ecosystems that can be compared with other locations. To preserve mangroves as an ecosystem with high services, it is necessary to map the health of mangroves. Ketapang Subdistrict, South Lampung Regency is one of the areas where the conversion of land into a pond area has a significant impact on mangrove damage. This study aims to identify mangrove health based on the vegetation index from Sentinel 2A imagery and spectral measurements in the field. The research methods used are supervised classification with support vector machine algorithm, GNDVI, SAVI and TSAVI, and direct measurement of object reflection. the result of the GNDVI, SAVI, and TSAVI correlation coefficient $(\mathrm{R}^{2})$ values are 0.71, 0.6, and 0.66 respectively. If the value of the correlation coefficient is in the range of 0.50-0.70, it can be said that the relationship is very strong between parameters. Mangrove health classification is classified into 3 classes: poor, moderate and healthy. The mangrove health area obtained ranged from poor class 17.0 ha with an area percentage of 7.13%, medium class 23.78 ha with a percentage of 9.98% and healthy class 197.63 ha with a percentage of 82.89%. The total area of mangroves is about 238.42 ha. Based on 30 sample points of field observation, the results of the accuracy test show an overall accuracy of 86.67%.
基于Sentinel 2A和野外光谱仪数据的红树林健康评价多光谱图像
红树林健康状况是显示红树林生态系统质量的参数之一,可以与其他地区进行比较。为了保护红树林作为一个具有高服务功能的生态系统,有必要绘制红树林的健康地图。南楠榜县吉打邦街道是将土地转变为池塘区对红树林破坏产生重大影响的地区之一。本研究旨在基于Sentinel 2A图像的植被指数和野外光谱测量来确定红树林的健康状况。研究方法包括支持向量机监督分类、GNDVI、SAVI和TSAVI,以及直接测量目标反射。GNDVI、SAVI和TSAVI相关系数$(\ mathm {R}^{2})$值分别为0.71、0.6和0.66。如果相关系数的值在0.50-0.70的范围内,则可以说参数之间的关系非常强。红树林健康等级分为3个等级:差、中等和健康。获得的红树林健康面积从不良级17.0公顷(面积百分比为7.13%)、中等级23.78公顷(面积百分比为9.98%)和健康级197.63公顷(面积百分比为82.89%)不等。红树林总面积约为238.42公顷。基于30个样点的野外观测,精度测试结果表明,总体精度为86.67%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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