ASTER和Landsat-7 ETM+两种多光谱传感器影像的交互对比

20世纪末以来,多种新型传感器的升空使得不同传感器之间的互为比较成为一个新的研究热点,但是ASTER和Landsat-7 ETM+传感器多光谱数据之间的全面对比在国内外尚未报道,为此,该文对AS-TER和Lanolsat-7 ETM+传感器影像数据进行了对比互补研究.文章从传感器的轨道特征、扫描方式、光谱范围和光谱响应特征等方面对二者进行机理上的分析和对比.在此基础上,基于3对同步过空的影像对和大面积同质感兴趣区的实验和统计分析,研究了ASTER与Landsat-7 ETM+传感器在可见光-近红外、短波红外各对应光谱波段之间的关系,提出了各对应波段相互转换的关系方程式,验证了所求的关系方程的有效性.最后对两种传感器影像对应光谱波段的差异进行了分析.验证结果表明,所求的关系转换方程具有较高的精度.

Cross-comparison between ASTER and Landsat-7 ETM+ multispectral imagery

Up to present, no study has been published with respect to the cross-comparison between ASTER and Landsat-7 ETM+ imagery. Therefore, the present paper has implemented the complementary study on the images between these two sensors. The study firstly conducted the sensors characteristics comparison, including orbit characteristic, sensor scanning mode and imagery spectral characteristic. Further comparison was implemented to get the relation equations between corresponding VNIR and SWIR bands of these two sensors based on the apparent reflectance of the three pairs of synchronization images and large common ground regions. The validation has been done to verify the effectiveness of the proposed corresponding bands relation equations and matching coefficients. The result shows that the provided relation equations have high accuracy.