dwctaxon (version 2.0.4)

dct_fill_col: Fill a column of a taxonomic database

Description

Fill a column in a taxonomic database in Darwin Core (DwC) format.

Usage

dct_fill_col(
  tax_dat,
  fill_to = "acceptedNameUsage",
  fill_from = "scientificName",
  match_to = "taxonID",
  match_from = "acceptedNameUsageID",
  stamp_modified = dct_options()$stamp_modified
)

Value

Dataframe; taxonomic database in DwC format.

Arguments

tax_dat

Dataframe; taxonomic database in DwC format.

fill_to

Character vector of length 1; name of column to fill. If the column does not yet exist it will be created.

fill_from

Character vector of length 1; name of column to copy values from when filling.

match_to

Character vector of length 1; name of column to match to.

match_from

Character vector of length 1; name of column to match from.

stamp_modified

Logical vector of length 1; should the modified column of any newly created or modified row include a timestamp with the date and time of its creation/modification? If the modified column does not yet exist it will be created. Default TRUE.

Details

Several terms (columns) in DwC format come in pairs of "term" and "termID"; for example, "acceptedNameUsage" and "acceptedNameUsageID", where the first is the value in a human-readable form (in this case, scientific name of the accepted taxon) and the second is the value used by a machine (in this case, taxonID of the accepted taxon). Other pairs include "parentNameUsage" and "parentNameUsageID", "scientificName" and "scientificNameID", etc. None are required to be used in a given DwC dataset.

Often when updating data, the user may only fill in one value or the other (e.g., "acceptedNameUsage" or "acceptedNameUsageID"), but not both. The purpose of dct_fill_col() is to fill the missing column.

match_from and match_to are used to locate the values used for filling each cell. The values in the match_to column must be unique.

The default settings are to fill acceptedNameUsage with values from scientificName by matching acceptedNameUsageID to taxonID (see Example).

When adding timestamps with stamp_modified, any row that differs from the original data (tax_dat) is considered modified. This includes when a new column is added, in which case all rows will be considered modified.

Examples

# Fill acceptedNameUsage with values from scientificName by
# matching acceptedNameUsageID to taxonID
(head(dct_filmies, 5)) |>
  dct_fill_col(
    fill_to = "acceptedNameUsage",
    fill_from = "scientificName",
    match_to = "taxonID",
    match_from = "acceptedNameUsageID"
  )