基于遥感的龙海市水田专题信息提取方法研究

以Landsat-7ETM⁺图像为基本资料,采用人机交互式非监督分类法、最大似然法和谱间关系阈值法分别提取龙海市水田信息。研究表明,3种方法各有优缺点,后2种方法提取精度较高,其中,谱间关系阈值法在分析不同类型水体与其背景地物光谱特征差异的基础上,挖掘谱间结构,总结各地物相分离的规律,因此提取效果最好。

RESEARCHES ON EXTRACTING THEMATIC INFORMATION FROM PADDY FIELDS IN LONGHAI CITY BASED ON REMOTE SENSING TECHNIQUE

Thematic information extraction approaches have always been the focus and hotspot in remote sensing study and application. The unsupervised classification method, the supervised classification method and the threshold method with spectral structure were used to extract paddy fields information of Longhai City based on Landsat-7 ETM⁺ imagery. The study indicates that each of the three methods has its advantages and disadvantages. Satisfying results have been achieved by the last two methods. The differences between paddy fields and other land-use types and the structures of different spectra have been analyzed adequately, and some regularities governing the separation have been obtained. The result of the threshold method with spectral structure seems to be the best of the three methods.