| 东北区域水体密度指数估算方法 |
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| 引用本文： | 祝青林,刘莉,尹文昱,王丽娜.东北区域水体密度指数估算方法[J].应用气象学报,2009,20(3):365-369. |
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| 作者姓名： | 祝青林 刘莉 尹文昱 王丽娜 |
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| 作者单位： | 1.大连市气象台 大连 116001 |
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| 基金项目： | 中国气象局项目，大连市科技委项目 |
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| 摘 要： | 水体密度指数是生态质量气象评价的一个重要指标。该文提出了一种利用MODIS遥感数据估算水体密度指数的方法，首先利用水体与地物遥感光谱特性的差异，对指示性水体的面积进行精确识别和提取；通过选择不同时相MODIS数据与地而水文观测资料建立统计关系模型，实现对区域水环境面积的估算；最后计算归一化权重系数，实现东北地区水体密度指数的估算。
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| 关 键 词： | 生态质量气象评价 水体密度指数 标准化指标 |
| 收稿时间： | 2008-06-11 |
Method to Evaluate Index of Water Bodies Density in Northeast China |
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| Zhu Qinglin,Liu Li,Yin Wenyu and Wang Lina.Method to Evaluate Index of Water Bodies Density in Northeast China[J].Quarterly Journal of Applied Meteorology,2009,20(3):365-369. |
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| Authors: | Zhu Qinglin Liu Li Yin Wenyu and Wang Lina |
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| Institution: | 1.Dalian Municipal Meteorological Office, Dalian 1160012.Meteorological Bureau of Dalian, Dalian 1160013.Dalian Weather Modification Office, Dalian 116001 |
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| Abstract: | Meteorological assessment of ecological qualities is proposed by China Meteorological Administration. The assessment is applied to evaluate ecological quality and its effect with appropriate indexes and proper methods. The trial evaluation scheme of ecological quality meteorology selects humidity, vegetation cover-age, water environment, land degeneration, and disaster occurrence indexes for evaluation, among which water environment is the most important one. However, there isn't a satisfactory way to evaluate index of water environment so far.Apractical method is proposed to evaluate the contribution of water body to ecological quality using MODIS data and ground observational data. Moderate resolution imaging spectroradiometer data is obtained from DVBS (Digital Video Broadcast by Satellite) by China Meteorological Administration. And the ground observational data is obtained from Water Affairs Bureau.First, several huge water bodies are chosen, as small area water bodies cannot be well monitored by MODIS. The area of these indicative water bodies has a preferable relationship with that of total water bodies. By analyzing water and other objects' spectral characteristics on EOS/MODIS images, the distinguished water compound bands are decided to get the method to recognize water area from remote sensing images. Then the threshold values of the channel reflectance and bright temperature of MODIS data are determined to distinguish water body from other objects. MODIS data of clear days in different seasons are adopted as much as possible to make statistical comparisons with ground observational data, thus a regression model can be set up between areas of indicator water bodies and total water area.Second, river length, lake and reservoir areas and length of coastline are chosen as indicators of water environment index. Each indicator has a weight to decide its contribution to water environment index, and the weight is calculated by normalization methods. So the water environment index is calculated by the summation of river length, lake and reservoir areas and length of coastline multiplied their weights respectively.Finally, the method is applied to evaluate water body indexes in Northeast China, and is proven feasible and practicable. |
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