The signal to noise ratio assessment of CE-1 IIM data

As one of the most important payloads on Chang´e-1 satellite, the Interference Imaging Spectrometer (IIM) got large amounts of hyperspectral data for retrieving elements and mineral information of the lunar surface. The signal to noise ratio (SNR) of the IIM hyperspectral data has been assessed for the further applications of the IIM data. As the assessment results show, the SNR of the IIM data shows good value on the whole and the middle bands are much higher than the bands at the both ends. As the reflectance peak of the plagioclase and the pyroxene spectrum, the bands centered around 750nm exhibit high SNR, which is of great importance for retrieving elements and minerals on the lunar surface. However, the bands centered around 930nm, as the absorption valley, exhibit poor SNR. As the SNRs are not high enough on the whole, the noises of the first nine bands should be reduced carefully before used, although they have an obvious trend of rising. Moreover, the first band and the last one have too low SNRs to use.