Creates a data.frame mapping nightlight tile names to their vertice coordinates. This is used to identify nightlight tiles as well as to build a spatial polygons dataframe used to plot the tiles. OLS only has one tile for the whole world and thus has a dummy entry. OLS is included to prevent code duplication by writing separate functions for OLS.
the nlType of interest
A data.frame of names of tiles and lon-lat coordinate of top-left corner of each
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