HJ-A遥感卫星CCD数据质量评价

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。

CCD Data Quality Evaluation of HJ-1A Satellite

The present paper selects indexes such as average gray value, standard deviation, information entro-py and OIF for quantitatively evaluate the quality of CCD data,which analyzes the geometric positioning pre-cision and the radiation quality of CCD data,and compared it with that of CBERS-02Band TM5. The results shows that：①The Level 2 product’s absolute positioning accuracy of CCD is higher than that of CBERS-02B. ②the radiation quality of all CCD data’s bands is good. However, compared to that of CBERS-02B and TM5, it is a little worse.③The resolution to surface features was higher and the surface fea-ture’s level is clearer. Band 1, band 3, band 4 were the best combination. As a whole, CCD data of HJ-1A sat-ellite has the higher geometric positioning precision and radiation quality and the high temporal resolution. It plays an important role in the fields of environment monitoring, evaluation, disaster alleviation and the disas-ter relief in our country.