| auk_date {auk} | R Documentation |
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 |
|
date |
character or date; date range to filter by, provided either as a
character vector in the format |
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"))