We are working with SUOMI-NPP VIIRS DNB (Day-Night Band) radiance data, which has units of W cm-2 sr-1. The case study area is a bird sanctuary and an inhabited territory that is also used for camping/ecotourism during summer. We are comparing multitemporal data from winter (no tourism) and summer, in order to assess the impacts of light pollution induced by tourism in the local avifauna. Nevertheless, most differences of radiance among both dates are only up to 0.1 W cm-2 sr-1. Are these differences relevants from a light pollution assessment point of view? Do you know any reference(s) that classify the magnitudes of Day-Night Band radiance data into potential light pollution sources?
Thanks in advance.
Cheers
AG
Hi Artur,
it's been a long time... :) How are you?
Take a look at this conversion between the radiance and illuminance: http://radsite.lbl.gov/radiance/refer/rc97tut.pdf
Take also comparison between different light sources:
https://en.wikipedia.org/wiki/Lux
Consider then, that if you have any artificial light, it probably covers only a small portion of a pixel.
So I guess that the difference is probably small.
Cheers, Klemen
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