title: how to convert ArcGIS raster layers into .grd files and upload into R?
body: <p>I am trying to create background data points in R as part of a species distribution modelling project. I cannot figure out how to convert my environmental predictor raster layers (annual precipitation, mean summer temperatures, etc.) into .grd files so that I can read them into R. Are there some basic steps to follow to convert Raster data into .grd files?</p>