A new method based on additive vegetation index for mapping Huangtai algae coverage in Lake Ulansuhai
A new method based on additive vegetation index for mapping Huangtai algae coverage in Lake Ulansuhai
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基于加性植被指数的乌兰素海黄台藻覆盖度制图新方法
DOI：
10.1007/s11356-022-23781-4
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发表时间：
2022-11
影响因子：
5.8
通讯作者：
Changwei Lu
中科院分区：
文献类型：
--
作者：
Liangqi Sun;Zhuangzhuang Zhang;Yuan Li;Linxiang Zhang;Qi Chen;Ruihong Yu;Yanling Hao;Changwei Lu
黄台藻华是富营养化和湖泊生态系统破坏的关键指标。了解其生长的时空异质性对于保护生态环境至关重要。二元像元模型通常用于估计植被覆盖度；然而，归一化差异植被指数等指标尚未专门针对黄台藻谱构建，因此作为指标使用不够具体或不够精确。因此，我们提出了一种基于新型加性植被指数的新二元像素模型，使用分辨率为 30 米的 Landsat 多光谱卫星图像来计算每个像素的黄台藻覆盖度。结果表明，R2= 0.994的加性植被指数比归一化差值植被指数、增强型植被指数和比值植被指数更好，新模型的准确率达到86.61%。利用2006年至2016年的月度Landsat图像来计算黄台藻覆盖度。月际变化分析表明，5月至7月覆盖率有所上升，2008年和2013年的年度最大值和最小值分别为14.43%和0.33%。本研究为黄台藻类覆盖提供了新的参考图，对乌兰素海湖环境监测和保护具有重要意义。
Huangtai algal blooms are key indicators of eutrophication and lake-ecosystem damage. Understanding the spatiotemporal heterogeneity of their growth is critical for preserving the ecological environment. The dimidiate pixel model is commonly used to estimate vegetation coverage; however, indices such as the normalized difference vegetation index have not been specifically constructed for the Huangtai algae spectrum and thus are not specific or sufficiently precise for use as indicators. Therefore, we propose a new dimidiate pixel model based on a novel additive vegetation index to calculate the Huangtai algal coverage for each pixel using Landsat multispectral satellite images with 30-m resolution. The results showed that the additive vegetation index with R2= 0.994 is a better indicator than the normalized difference vegetation index, enhanced vegetative index, and ratio vegetative index, with the accuracy of the new model reaching 86.61%. Monthly Landsat images from 2006 to 2016 were used to calculate the Huangtai algal coverage. Analysis of the inter-monthly variation indicated increased coverage from May to July, with an annual maximum and minimum of 14.43% and 0.33% in 2008 and 2013, respectively. This study provides a new reference map of Huangtai algal cover, which is important for monitoring and protecting the Lake Ulansuhai environment.
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通讯作者：
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影响因子：
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