database operations to connect and load data
get_db_con()
get database connection
csv_to_db()
load csv data into database
handle taxonomic naming and fetch remote species data
get_iucn()
get IUCN Red List information
group_to_grp()
convert proper Group to grp abbreviation for file naming
grp_to_group()
convert grp abbreviation to proper Group for file naming
raster operations, eg for converting from database
df_to_raster()
data frame to global half-degree raster
raster_na()
get global half-degree raster with NAs