Fig. 2From: Calibration of imaging parameters for space-borne airglow photography using city light positionsCity lights map observed by the DMSP satellite. The red circles indicate city light positions used for the calibration. The red numbers are corresponding to the green numbers shown in Fig. 1. The DMSP image and data were processed by NOAA’s National Geophysical Data Center, and the DMSP data were collected by US Air Force Weather AgencyBack to article page