gplot_data()
Transform raster as data.frame to be later used with ggplot Modified from rasterVis::gplot
regional_seas()
Create buffer divided by closest region
sun_position()
Calculate the position of the sun according to date and geographical position in wgs84 Found here: http://stackoverflow.com/questions/8708048/position-of-the-sun-given-time-of-day-latitude-and-longitude