auk (version 0.8.0)

auk_county: Filter the eBird data by county

Description

Define a filter for the eBird Basic Dataset (EBD) based on a set of counties 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_county(x, county, replace = FALSE)

Value

An auk_ebd object.

Arguments

x

auk_ebd or auk_sampling object; reference to file created by auk_ebd() or auk_sampling().

county

character; counties to filter by. eBird uses county codes consisting of three parts, the 2-letter ISO country code, a 1-3 character state code, and a county code, all separated by a dash. For example, "US-NY-109" corresponds to Tompkins, NY, US. The easiest way to find a county code is to find the corresponding explore region page and look at the URL.

replace

logical; multiple calls to auk_county() are additive, unless replace = FALSE, in which case the previous list of states to filter by will be removed and replaced by that in the current call.

Details

It is not possible to filter by both county as well as country or state, so calling auk_county() will reset these filters to all countries and states, and vice versa.

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

See Also

Other filter: auk_bbox(), auk_bcr(), auk_breeding(), auk_complete(), auk_country(), auk_date(), 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

# choose tompkins county, ny, united states
system.file("extdata/ebd-sample.txt", package = "auk") %>%
  auk_ebd() %>%
  auk_county("US-NY-109")
  
# alternatively, without pipes
ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
auk_county(ebd, "US-NY-109")