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中国环境与灾害监测预报小卫星星座双星4部CCD传感器具备大范围、全天时环境与灾害监测等方面的能力,在空间覆盖与重复观测频率方面有很大的优势。结合美国陆地卫星TM数据,从几何精度、辐射质量2个方面定量分析了该卫星CCD传感器的数据质量。结果表明:①环境减灾卫星CCD数据无波段错位现象,有极小的畸变与扭曲(0.05%),然而存在较大的整体几何误差。②CCD数据的整体辐射范围、信噪比与TM数据相比并无明显区别,但其清晰度的不足导致在地物识别、特征提取与图像量测方面的应用存在着一定的限制。③CCD数据的信息量较为丰富,4、3、2波段的标准假彩色合成包是波段合成方案中的最佳波段组合。CCD数据的功率谱保证了其具有丰富的纹理特征,对于诸如土地利用/覆被变化等方面的研究,其信息量与纹理特征能够保证其应用精度。④CCD传感器4个波段间,近红外与红波段表现最好,与TM传感器相应波段相比质量相当,其次为绿波段与蓝波段。
China Environment and Disaster Monitoring and Prediction Small satellite constellation Double CCD 4 CCD sensors have the capability of large-scale, all-day environment and disaster monitoring, and have great advantages in space coverage and repeated observation frequency. Combined with the data from the United States Landsat TM, the data quality of the satellite CCD sensor is quantitatively analyzed from two aspects of geometric accuracy and radiation quality. The results show that: (1) There is no band offset in CCD data of environmental mitigation satellite with minimal distortion and distortion (0.05%), however, there is a large overall geometric error. The overall radiation range and signal-to-noise ratio of CCD data are not significantly different from those of TM data. However, the lack of definition leads to some limitations on the application of feature recognition, feature extraction and image measurement. ③ The amount of information in CCD is more abundant, and the standard false color composite package in 4, 3, and 2 bands is the best band combination in the band synthesis scheme. The power spectrum of CCD data ensures its rich texture features, and its information and texture features can guarantee the accuracy of its application in researches such as land use / cover change. ④CDCD sensor 4 bands, near infrared and red band performance best, and TM sensor corresponding band compared to the quality, followed by the green band and blue band.