byteint2bit: no visible global function definition for 'digitsBase'
check_for_matching_geolocation_files: no visible global function
  definition for 'head'
extract_bit: no visible global function definition for 'digitsBase'
fermat.test: no visible global function definition for 'runif'
get_bitgrid: no visible global function definition for 'raster'
get_bitgrid: no visible global function definition for 'coordinates'
get_bitgrid: no visible global function definition for 'extract'
get_bitgrid_2bits: no visible global function definition for 'raster'
get_bitgrid_2bits: no visible global function definition for
  'coordinates'
get_bitgrid_2bits: no visible global function definition for 'extract'
make_cloudcount_product: no visible global function definition for
  'CRS'
make_cloudcount_product: no visible global function definition for
  'proj4string'
make_cloudcount_product: no visible global function definition for
  'extent'
make_cloudcount_product: no visible global function definition for
  'coordinates<-'
make_cloudcount_product: no visible global function definition for
  'SpatialPixelsDataFrame'
make_cloudcount_product: no visible global function definition for
  'coordinates'
modfns_to_ftp_download_cmd: no visible global function definition for
  'write.table'
numslist_to_grd: no visible global function definition for 'CRS'
numslist_to_grd: no visible global function definition for
  'proj4string'
numslist_to_grd: no visible global function definition for 'extent'
numslist_to_grd: no visible global function definition for
  'coordinates<-'
numslist_to_grd: no visible global function definition for
  'SpatialPixelsDataFrame'
numslist_to_grd: no visible global function definition for
  'coordinates'
write_MRTSwath_param_file: no visible global function definition for
  'write.table'
yearday_to_date: no visible global function definition for 'mdy.date'
yearday_to_date: no visible global function definition for 'date.mdy'
yearmonthday_to_julianday: no visible global function definition for
  'mdy.date'
Undefined global functions or variables:
  CRS SpatialPixelsDataFrame coordinates coordinates<- date.mdy
  digitsBase extent extract head mdy.date proj4string raster runif
  write.table
Consider adding
  importFrom("stats", "runif")
  importFrom("utils", "head", "write.table")
to your NAMESPACE file.