![]() ![]() In addition to the lack of an on-board radiance calibration, DMSP experienced saturation in cities and had low (8 bit) radiometric resolution and an intrinsic spatial resolution of 5 km ( 15). These methods sometimes rely on questionable assumptions, such as the assumption that Sicily experienced no changes in lighting over a 15-year period ( 14). Despite this drawback, there have been attempts to use statistical methods to try to intercalibrate the time series. ![]() The well-known older images of Earth at night ( 13) were based on an uncalibrated sensor from a defense satellite, which had frequent and unrecorded changes in sensor gain. Changes in outdoor lighting can be measured on the global scale only via Earth-observing satellites, but no calibrated satellite sensor has made global observations of night lights until recently. ![]()
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