CoordinateCleaner (version 2.0-20)

cc_zero: Identify Zero Coordinates

Description

Removes or flags records with either zero longitude or latitude and a radius around the point at zero longitude and zero latitude. These problems are often due to erroneous data-entry or geo-referencing and can lead to typical patterns of high diversity around the equator.

Usage

cc_zero(
  x,
  lon = "decimallongitude",
  lat = "decimallatitude",
  buffer = 0.5,
  value = "clean",
  verbose = TRUE
)

Value

Depending on the ‘value’ argument, either a data.frame

containing the records considered correct by the test (“clean”) or a logical vector (“flagged”), with TRUE = test passed and FALSE = test failed/potentially problematic . Default = “clean”.

Arguments

x

data.frame. Containing geographical coordinates and species names.

lon

character string. The column with the longitude coordinates. Default = “decimallongitude”.

lat

character string. The column with the latitude coordinates. Default = “decimallatitude”.

buffer

numerical. The buffer around the 0/0 point, where records should be flagged as problematic, in decimal degrees. Default = 0.1.

value

character string. Defining the output value. See value.

verbose

logical. If TRUE reports the name of the test and the number of records flagged.

See Also

Other Coordinates: cc_cap(), cc_cen(), cc_coun(), cc_dupl(), cc_equ(), cc_gbif(), cc_inst(), cc_iucn(), cc_outl(), cc_sea(), cc_urb(), cc_val()

Examples

x <- data.frame(species = "A", 
                decimallongitude = c(0,34.84, 0, 33.98), 
                decimallatitude = c(23.08, 0, 0, 15.98))
                
cc_zero(x)
cc_zero(x, value = "flagged")