This Python script calculates horizontal skyglow from VIIRS-DNB images via a simple convolution using a Fast Fourier Transform (FFT), as opposed to usual, inefficient pixel-by-pixel methods.

The dependencies for the scripts are:

1. Numpy - Mathematical functionality and Linear Algebra
2. Rasterio - Raster manipulation
3. Matplotlib - Data Visualisation
4. Tqdm - Progress Bars
5. TOML - Python TOML parser

The necessary libraries can be installed via: pip install -r requirements.txt

To run the script, use python main.py.

Please, ensure you set up the correct paths, directories and model parameters in the settings.toml file.

Example output:

More information on the method can be found in:

Bará, et al. (2019), "Fast Fourier-transform calculation of artificial night sky brightness maps"

Available at: https://arxiv.org/abs/1907.02891