SAR影像时间序列支持下的互花米草盐沼提取——以江苏盐城东部沿海为例

利用江苏盐城东部沿海8幅ERS-2 SAR影像构建像素级时间序列,根据训练样本得出互花米草盐沼的标准时间序列曲线;基于动态时间弯曲DTW距离进行时间序列相似性分析后提取互花米草盐沼,用同年Landsat TM影像、CBERS-02B CCD影像目视解译的真实地面数据进行精度评价。结果表明:1)互花米草盐沼的时间序列曲线呈波动性变化,与研究区其他4类典型地物的时间序列曲线差异较大;2)互花米草盐沼提取结果的精度较高,基于Landsat TM影像的精度评价结果——正确率86.81%,完整率84.63%,基于CBERS-02B CCD影像的精度评价结果——正确率87.84%,完整率83.87%。

Spartina alterniflora Salt Marshes Extraction Using SAR Image Time Series on the Eastern Coast of Yancheng,Jiangsu Province

Based on the study area on the eastern coast of Yancheng, Jiangsu Province, eight scenes of ERS-2 SAR images were collected to construct pixel-level time series. Then training samples of Spartina alterniflora salt mar-shes were picked up to calculate standard time series. At last, Spartina alterniflora salt marshes were extracted ac-cording to DTW distance and the extraction results were evaluated by real ground data interpreted from Landsat TM image and CBERS-02B CCD image. The results show that:1) Time series of Spartina alterniflora salt marshes change fluctuatingly and are quite different from that of other four typical surface features. 2) The extraction accu-racy of Spartina alterniflora salt marshes is high on account of the correctness is 86.81% and completeness is 84. 63% according to Landsat TM image and the correctness is 87. 84% and completeness is 83. 87% according to CBERS-02B CCD image.