I'm quite beginner at R so I'm struggling with what I've found on google for how to plot species occurrence data points in R (I know how in QGIS but my supervisors want R) and then fill in 10km or 1km grid squares where the species has occurred. The photo shows what I mean but has been produced in DMap
The main issue I have is that my csv file of records only has alphanumeric Ordnance Survey grid references - can R plot with these or do they need to be split into easting/northings or even decimal latitude/longitude? and if so, how?
Any help is greatly appreciated!