Continuous Monitoring of Nighttime Light Changes Based on Daily NASA's
Black Marble Product Suite
Abstract
Monitoring nighttime light (NTL) change enables us to quantitatively
analyze the patterns of human footprint and socioeconomic features.
NASA’s Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band
(DNB) atmospheric and Lunar-BRDF-corrected Black Marble product provides
15-arc-second daily global nighttime radiances with high temporal
consistency. However, timely and continuous monitoring of NTL changes
based on the dense DNB time series is still lacking. In this study, we
proposed a Viewing Zenith Angle (VZA) stratified COntinuous monitoring
of Land Disturbance (COLD) algorithm (VZA-COLD) to detect NTL change at
15-arc-second resolution. Specifically, we divided the clear
observations into four VZA intervals (0-20°, 20°-40°, 40°-60°, 0-60°) to
mitigate the temporal variation of the NTL data caused by the combined
angular effect of viewing geometry and the various kinds of surface
conditions. Single term harmonic models were continuously estimated for
new observations from each VZA interval, and by comparing the model
predictions with the actual DNB observations, a unified set of NTL
changes can be captured continuously among the different VZA intervals.
The final NTL change maps were generated after excluding the consistent
dark pixels. Results show that the algorithms reduced the DNB data
temporal variations caused by disparities among different viewing angles
and surface conditions, and successfully detected NTL changes for six
globally distributed test sites with an overall accuracy of 99.78% and
a user’s accuracy of 68.25%, a producer’s accuracy of 66.89% for the
NTL change category.