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- I rasterize the raw satellite images and remove artefacts (gas flares and aurora borealis), boats, etc. I reduce the sample to illuminated landmasses by detecting borders with georeferenced border shapefiles from Weidmann et al. (2010). In line with the literature I intercalibrate across years following Elvidge et al. (2014) with: DN = c0 + c1DN + c2DN2 A number of years have observations from two satellites. For these years I average the intercalibrated data by cell. Using this processed data I calculate great circle distances between each illuminated cell and calculate the generalized mean as discussed above.
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- To reduce the size of the distance matrix to be calculated while maintaining general validity, I randomly draw 100 times 1 percent and a minimum of 1000 from each country’s illuminated cells.
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