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Radiation Quality Evaluation of Orbita HyperSpectral Image

机译：Orbita高光谱图像的辐射质量评估

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The Orbita Hyper Spectral (OHS)-2 and 3 satellites were successfully launched on April 26, 2018 and September 19, 2019, respectively. The basis of remote sensing data applications is the data quality evaluation. Rradiation accuracy, image definition, signal to noise ratio (SNR) and entropy were selected as evaluating indicators, the radiation quality of OHS level 1 images were evaluated, and the radiation quality of OHS-2A and OHS-3D were compared. The results showed that the image definition (EVA) of each band of OHS-2A is above 24. The signal-to-noise ratio (SNR) is between 1-14 and the information entropy (H) is above 5.4. The SNR of the 466-686nm . spectral showed a decreasing trend, especially in the 686nm spectrum, the SNR showed a minimum value. Each band definition of OHS-3D is above 16, and SNR is between 1-37, while the entropy is 4.5 above. In the 896nm-940nm (29-32 bands) spectrum, the entropy and definition showed a decreasing trend. At the same time, at 940nm (32 band), the minimum values of the entropy and definition appeared, while the OHS hyperspectral data has a high information entropy than EO-1 Hyperion hyperspectral data and HJ1B data, and they all showed the same level in SNR and information entropy. In blue (466-520nm), green (536-596nm), red (610-730nm) and infrared spectrum (746-940nm), the maximum and average values of SNR, definition and entropy of OHS-3D were all greater than that of OHS-2A. In general, the radiation of OHS-3D is better than that of OHS-2A. In the application of OHS-3D images, the last 4 bands (29-32 bands) could be abandoned. Due to the high spatial resolution (10m) and high temporal resolution (2 days) ,OHS plays an irreplaceable role in agricultural remote sensing and inland/coastal water quality monitoring.
机译：2018年4月26日和2019年9月19日，成功推出了Orbita超频（OHS）-2和3颗卫星。遥感数据应用的基础是数据质量评估。选择rradiation精度，图像定义，信噪比（SNR）和熵被选择为评估指示器，评估OHS级图像的辐射质量，并比较OHS-2a和OHS-3D的辐射质量。结果表明，OHS-2A的每个频带的图像定义（EVA）高于24.信噪比（SNR）在1-14之间，信息熵（H）高于5.4。 466-686nm的SNR。光谱显示趋势降低，特别是在686nm光谱中，SNR显示出最小值。 OHS-3D的每个频带定义高于16，SNR在1-37之间，而熵为4.5。在896nm-940nm（29-32条带）频谱中，熵和定义表现出降低趋势。同时，在940nm（32频段），熵和定义的最小值出现，而OHS高光谱数据具有比EO-1 Hyperion高光谱数据和HJ1B数据的高信息熵，并且它们都显示了相同的级别在SNR和信息熵。在蓝色（466-520nm），绿色（536-596nm），红色（610-730nm）和红外光谱（746-940nm），SNR的最大和平均值，OHS-3D的熵大于那个OHS-2A。通常，OHS-3D的辐射优于OHS-2A的辐射。在OHS-3D图像的应用中，可以放弃最后4个频带（29-32频带）。由于空间分辨率高（10米）和高时分辨率（2天），ohs在农业遥感和内陆/沿海水质监测中起着不可替代的作用。

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