Monthly cloud-free composites of nighttime lights (NTL) radiance for Adventfjorden (Svalbard) during polar nights 2012-2022.

This dataset contains monthly averaged radiance values of nighttime lights in the coastal zone of Longyearbyen, Svalbard, covering the period from January 2012 to December 2022. The data were derived from the NASA-provided VIIRS Day/Night Band (DNB) VNP46A3 product, which offers monthly cloud-free composites of nighttime light (NTL) observations, corrected for atmospheric and lunar effects using a Bidirectional Reflectance Distribution Function (BRDF). The study area encompasses the coastal stretch from the port piers to the airport. The exact spatial extent is delineated in Figure 1 of the publication Balazy et al. (2025) Illuminating the Arctic: Unveiling seabird responses to artificial light during polar darkness through citizen science and remote sensing. The dataset includes the following variables: Year: Calendar year of observation. Month: Calendar month of observation. PixelsID: Unique identifier for each spatial pixel. AASC_Radiance / AASF_Radiance: Monthly mean radiance (in nW·cm⁻²·sr⁻¹) under All Angle Composite Snow Covered (AASC) and Snow Free (AASF) conditions, respectively. AASC_SD / AASF_SD: Standard deviation of radiance values across all observations in a given month and condition, indicating the temporal stability of light emissions. AASC_NO observations / AASF_NO observations: Number of individual observations used to calculate the monthly average. AASC_Quality / AASF_Quality: Quality flags for radiance values. Values are: 0 = Good quality, 1 = Poor quality, 2 = Gap filled, 255 = Fill value, NA = no value.