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选取灰度均值、标准差、信息熵值以及最佳指数等指标和方法,对HJ-1A卫星的CCD数据在几何定位精度、辐射质量和最近波段组合等方面进行了的定量分析,并与CBERS-02B、TM5进行对比。结果表明:HJ-1A CCD二级产品的绝对定位精度较CBERS-02B有一定的提高;HJ-1A CCD数据各波段的辐射质量较好,但与CBERS-02B和TM5比较仍有一定差距;对地物的分辨能力较高,地物的层次较清晰,B1、B3、B4波段组合影像效果最佳。总体而言,HJ-1A CCD数据有较高的几何定位精度和辐射质量,同时具有高时间分辨率的优点,在我国环境监测、评价以及减灾、赈灾等领域将发挥重要作用。
Quantitative analysis of the CCD data of HJ-1A satellite in terms of geometric positioning accuracy, radiation quality and the combination of the most recent bands is carried out by selecting gray mean, standard deviation, information entropy and the best index and other indicators and methods, and with the CBERS -02B, TM5 for comparison. The results show that the absolute positioning accuracy of HJ-1A CCD secondary products is better than that of CBERS-02B; the radiation quality of each band of HJ-1A CCD data is better, but there is still a certain gap compared with CBERS-02B and TM5; High resolution of features, the level of features clear, B1, B3, B4 band combination of the best images. Overall, HJ-1A CCD data has high geometric positioning accuracy and radiation quality, and has the advantages of high temporal resolution. It will play an important role in environmental monitoring, assessment and disaster reduction and disaster relief in China.