auk (version 0.8.0)

auk_exotic: Filter the eBird data by exotic code

Description

Exotic codes are applied to eBird observations when the species is believe to be non-native to the given location. This function defines a filter for the eBird Basic Dataset (EBD) to subset observations to one or more of the exotic codes: "" (i.e. no code, meaning it is a native species), "N" (naturalized), "P" (provisional), or "X" (escapee). 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_exotic(x, exotic_code, 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().

exotic_code

characterr; exotic codes to filter by. Note that an empty string (""), meaning no exotic code, is used for native species.

replace

logical; multiple calls to auk_exotic() 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.

See Also

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

Examples

# filter to only native observations
ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
auk_exotic(ebd, exotic_code = "")

# filter to native and naturalized observations
auk_exotic(ebd, exotic_code = c("", "N"))