Measurements of angles (e.g. compass bearings, aspect) are circular in nature (e.g. 0 and 360 degrees coincide) and therefore cannot be meaningfully described by ordinary arithmetic means. I have a shapefile of 22 locations containing aspect value for each point. I want to calculate mean aspect of the locations using circular statistics in R. "circstats" is one of the packages that are suggested to me. Question: Do I need to transform aspect data before feeding into R (aspect data is calculated in GRASS)? How I can calculate the mean direction of aspect in R?
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