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Validation of non-sample footprints with high-resolution images: (a–c) NTL’s footprints on DMSP image that may be caused by traffic and temporary engineering activities; (d–f) NTL’s footprints on VIIRS image that may be caused by industry and traffic; (g–l) NTL’s footprints on LJ1-01 image that may be caused by industry, traffic and villages.
