资源一号02D可见近红外和高光谱影像辐射质量评价

资源一号02D（ZY1-02D）卫星搭载了我国自主研制的可见近红外相机（VNIC）和高光谱相机（AHSI），是我国首颗民用高光谱业务卫星，具有广泛的应用前景。通过整体辐射精度、信噪比、清晰度以及信息熵4个评价指标，对ZY1-02D VNIC和AHSI数据进行辐射质量评价，并分别采用Sentinel-2 MSI和GF-5 AHSI数据进行对比。结果表明： ZY1-02D VNIC数据在可见光波段具有亮度高、信噪比高等优势；在红边近红外等波段，影像具有灰度范围大、信息量大的特点。ZY-1-02D VNIC数据在影像亮度、灰度范围、清晰度和信息量方面均优于Sentinel-2，二者信噪比近似。ZY-1-02D AHSI数据在395—1 341 nm范围内辐射质量良好；在1 929—2 501 nm范围，存在噪声严重的波段，影像质量较差。与GF-5 AHSI数据对比，ZY-1-02D AHSI数据的影像亮度和信噪比相当，但ZY-1-02D AHSI数据在灰度范围方面优势明显，且短波红外谱段的清晰度和信息量优于GF-5 AHSI数据。

Radiance Quality Assessment of ZY-1-02D VNIC/AHSI Image Data

ZY-1-02D is the first civil hyperspectral satellite in China， equipped with Visible Near-Infrared Camera （VNIC） and Advanced Hyperspectral Imager （AHSI）. This study evaluates and analyzes the radiance quality of ZY-1-02D VNIC/AHSI data and compares them with Sentinel-2 MSI/GF-5 AHSI data. Four indicators are used to assess image quality： radiance precision， Signal-to-Noise Ratio （SNR）， definition， and Shannon entropy. The results indicate that ZY-1-02D VNIC data has the advantages of high radiance and high SNR in visible bands. In red-edge and near-infrared bands， ZY-1-02D VNIC data has the advantages of a large gray range and a large amount of information. The comparison between ZY-1-02D and Sentinel-2 MSI data shows that ZY-1-02D VNIC data has better performance in radiance， gray range， definition， and information content. The performance of the two sensors is similar in terms of SNR. ZY-1-02D AHSI data has great quality in 395~1 314 nm wavelength. However， in 1 929—2 501 nm， some bands have severe noise and poor quality caused by water vapor. The comparison between ZY-1-02D AHSI and GF-5 AHSI data shows that the performance in radiance and SNR of the two sensors are similar. The gray range of ZY-1-02D AHSI data is greater than GF-5 AHSI data in both VNIR and SWIR. The definition and information content of ZY-1-02D AHSI data are better than GF-5 AHSI data in SWIR bands.