Stripe Noise and Vignetting Correction for Sdgsat-1 Night-Time Light CCDS

Raw Night-Time-Light (NTL) images captured by the Glimmer Image for Urbanization (GIU) sensor of the SDGSAT-1 satellite face the problem of stripe noise and vignetting. This paper proposed a universal method for relative radiometric correction of NTL images captured by push-broom system. Firstly, NTL ground object pixels from stripe noise were masked by setting thresholds of digital number (DN) value, allowing for the calculation of stripe noise thresholds. Secondly, a new vignetting correction was proposed by using a novel "Night-Day" orbital images as calibration data. The calculated stripe noise thresholds and vignetting correction parameters can be applied to other raw orbital images. The results were found to be superior to existing methods. In addition, using the calculated correction parameters can solve the residual stripes existing in the official products. Finally, the results of relative radiometric correction on raw images from different places further demonstrate the credibility of the proposed method.