auk_date: Filter the eBird data by date

In CornellLabofOrnithology/auk: eBird Data Extraction and Processing in R

Filter the eBird data by date

Description

Define a filter for the eBird Basic Dataset (EBD) based on a range of dates. This function only defines the filter and, once all filters have been defined, auk_filter() should be used to call AWK and perform the filtering.

Usage

auk_date(x, date)

Arguments

x	auk_ebd or auk_sampling object; reference to file created by auk_ebd() or auk_sampling().
date	character or date; date range to filter by, provided either as a character vector in the format "2015-12-31" or a vector of Date objects. To filter on a range of dates, regardless of year, use "*" in place of the year.

Details

To select observations from a range of dates, regardless of year, the wildcard "*" can be used in place of the year. For example, using date = c("*-05-01", "*-06-30") will return observations from May and June of any year. When using wildcards, dates can wrap around the year end.

This function can also work with on an auk_sampling object if the user only wishes to filter the sampling event data.

Value

An auk_ebd object.

See Also

Other filter: auk_bbox(), auk_bcr(), auk_breeding(), auk_complete(), auk_country(), auk_county(), auk_distance(), auk_duration(), auk_exotic(), auk_extent(), auk_filter(), auk_last_edited(), auk_observer(), auk_project(), auk_protocol(), auk_species(), auk_state(), auk_time(), auk_year()

Examples

system.file("extdata/ebd-sample.txt", package = "auk") %>%
  auk_ebd() %>%
  auk_date(date = c("2010-01-01", "2010-12-31"))
  
# alternatively, without pipes
ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
auk_date(ebd, date = c("2010-01-01", "2010-12-31"))

# the * wildcard can be used in place of year to select dates from all years
system.file("extdata/ebd-sample.txt", package = "auk") %>%
  auk_ebd() %>%
  # may-june records from all years
  auk_date(date = c("*-05-01", "*-06-30"))
  
# dates can also wrap around the end of the year
system.file("extdata/ebd-sample.txt", package = "auk") %>%
  auk_ebd() %>%
  # dec-jan records from all years
  auk_date(date = c("*-12-01", "*-01-31"))

CornellLabofOrnithology/auk documentation built on April 15, 2024, 12:48 a.m.