| 摘要: |
| 通过提取高光谱遥感信息, 对射阳河口悬浮泥沙浓度与实测光谱及Hyperion 影像光谱反射率进行了相关性分析, 结果表明: 射阳河口含沙水体对实测光谱反射率的敏感波段为898～904 nm, 对光谱分辨率为10 nm 的Hyperion 影像敏感波段正好位于896 nm 处, 以此构建的指数模型, 其相关指数达到0.89。模型的检验显示, 相对根均方差值为38.78%, 表明单波段896 nm 对预测射阳河口的悬沙质量浓度具有良好的精度。由于试验取样时间与Hyperion 影像的成像时间相匹配, 此时水流场较稳定, 河口水体中的泥沙运移与扩散规律与影像解译结果相似, 即: 近岸悬沙质量浓度高, 远海浓度低; 河口南侧由于属于淤长性海岸, 悬沙质量浓度比北侧高。研究结果为利用高光谱分析技术构建海洋悬沙含量的定量反演模型提供了可靠依据, 也为海洋水体其他物质成分的定量反演奠定了基础。 |
| 关键词: 射阳河口 悬沙质量浓度 Hyperion 影像 指数模型 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(40606044); 国家近海洋综合调查与评价专项资助项目(JS-908-01-05); 高等学校博士学科点专项科研基金(200803190007) |
|
| Modeling the suspended sediment content in Sheyang Estuary based on hyperspectral data |
|
|
| Abstract: |
| We analyzed the relativity between the suspended sediment content (SSC) and the experimental hyperspectral data or Hyperion reflectivity. The sensitive band of experimental spectral reflectivity for SSC estimation in Sheyang Estuary water was centered around 898~904 nm, and for Hyperion image, the central wavelength of sensitive band was 896 nm. An exponential model was established with the reflectivity of band 896 nm, and the validation result of the model showed a good simulation precision with a relative root mean square error value of 38.78%. The time for water samples gathering was mostly accordant with that of Hyperion imaging, and therefore the SSC distribution rule in Sheyang Estuary was consistent with Hyperion interpretation: gradual reduction in the SSC from the shore to the open sea and a higher SSC observed in the southern shore than the north. The patterns were consistent with the actual conditions. |
| Key words: Sheyang Estuary suspended sediment content Hyperion image exponential model |
