# Measuring Light Pollution with Fisheye Lens Imagery from A Moving Boat, A Proof of Concept

## TL;DR

This study demonstrates that using a commercial DSLR with fisheye lens from a moving boat can effectively measure night sky brightness, offering a new method for light pollution assessment in aquatic environments.

## Contribution

It introduces a novel proof of concept showing that all-sky photometry from a moving vessel is feasible for ecological light pollution studies.

## Key findings

- Measurements are consistent despite vessel movement.
- Saturation effects are the main limitation.
- Method is suitable for mapping light pollution in aquatic systems.

## Abstract

Near all-sky imaging photometry was performed from a boat on the Gulf of Aqaba to measure the night sky brightness in a coastal environment. The boat was not anchored, and therefore drifted and rocked. The camera was mounted on a tripod without any inertia/motion stabilization. A commercial digital single lens reflex (DSLR) camera and fisheye lens were used with ISO setting of 6400, with the exposure time varied between 0.5 s and 5 s. We find that despite movement of the vessel the measurements produce quantitatively comparable results apart from saturation effects. We discuss the potential and limitations of this method for mapping light pollution in marine and freshwater systems. This work represents the proof of concept that all-sky photometry with a commercial DSLR camera is a viable tool to determine light pollution in an ecological context from a moving boat.