本科毕业论文

基于MODIES影像的蓝藻的提取与研究

EXTRACTION AND CYANOBACTERIA BASED ON

MODIS IMAGES

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基于MODIS影像的蓝藻提取与研究

摘要

湖泊、河流等水资源遭到污染的事实正在一步步加重，对于水资源的保护已经日益成为不容忽视的社会问题。而蓝藻疯长是导致湖泊水华现象从而造成水资源污染的一个主要性因素。本次研究将利用具有高分辨率特点的MODIS影像数据进行太湖水域蓝藻的提取与分析，正确统计太湖水域各区的蓝藻爆发频次的变化，分析太湖蓝藻水华现象的爆发强度，爆发的主要地点和爆发的迁移过程，以及蓝藻水华在空间与时间上的分布规律，为蓝藻爆发提供正确的预警服务，以帮助有关部门进行蓝藻治理。

关键词：蓝藻水华，太湖，遥感，MODIS，时空分布

EXTRACTION AND CYANOBACTERIA BASED ON

MODIS IMAGES

ABSTRACT

Water lakes, rivers and other contaminated fact is a step increase, for the protection of water resources has increasingly become a social problem can not be ignored. The blue-green algae blooms soaring phenomenon leading to the lake water pollution causing a major factor. This study will use high resolution MODIS image data extraction and analysis of the characteristics of blue-green algae in Taihu Lake, the correct statistical outbreak of blue-green algae in Taihu Lake districts frequency changes, analyze the strength of the outbreak in Taihu cyanobacteria blooms, the main venue and the outbreak the outbreak of the migration process, as well as the distribution of cyanobacteria blooms in space and time, to provide the correct algae bloom warning services to help the relevant authorities for cyanobacteria governance. KEYWORDS：Cyanobacteria blooms，Taihu , Remote sensing , MODIS , Spatial and temporal distribution

目录

基于MODIES影像的蓝藻的提取与研究 ................................... 1 摘要 ................................................................ 1 ABSTRACT ............................................................ 2 绪论 ............................................................... 4 1 研究区域的基本情况 ................................................ 6

1.1 研究区域的选择-太湖 ......................................... 6 1.2 蓝藻水华的危害性 ............................................ 6 1.3 太湖蓝藻水华的治理情况 ...................................... 7 1.4 现阶段太湖蓝藻水华采用的治理方法 ............................. 8 2 MODIS影像数据的获取与处理 ....................................... 11

2.1 MODIS影像数据的概况 ........................................ 11 2.2 MODIS影像数据的获取 ........................................ 12 2.3 MODIS影像数据的处理 ........................................ 13

2.3.1 MODIS影像数据的预处理 ................................ 13 2.3.2 太湖水域中岛屿与干扰区域的去除 ........................ 14 2.4 太湖水域蓝藻水华信息的提取 ................................. 15

2.4.1 蓝藻提取的NDVI计算 ................................... 15

2.4.2 蓝藻提取阙值的确定 ................................... 15

2.5蓝藻覆盖区域爆发强度的计算 .................................. 16 3 蓝藻水华现象爆发的时空分布规律 ................................... 17

3.1 太湖蓝藻水华发生风险性的估算 ............................... 17 3.2蓝藻覆盖区域水华等级的划分 .................................. 18 3.3 蓝藻水华爆发频次空间分布规律 ............................... 18 3.4蓝藻水华爆发在不同湖区上的分布规律 .......................... 21 3.5蓝藻水华爆发频次时间分布规律 ................................ 22 3.6 2010年太湖水华现象年内变化特征 ............................. 24 4 太湖蓝藻信息研究的展望 ........................................... 27 4.1 太湖蓝藻的精确提取 .......................................... 27 4.2 太湖温度的反演 .............................................. 27 4.3 太湖蓝藻水华的监测与预警 .................................... 28 参考文献： ......................................................... 29 致谢： ............................................. 错误！未定义书签。