auk (version 0.2.2)

auk_extent: Filter the eBird data by spatial extent

Description

Define a filter for the eBird Basic Dataset (EBD) based on spatial extent. 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_extent(x, extent)

Arguments

x

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

extent

numeric; spatial extent expressed as the range of latitudes and longitudes in decimal degrees: c(lng_min, lat_min, lng_max, lat_max). Note that longitudes in the Western Hemisphere and latitudes sound of the equator should be given as negative numbers.

Value

An auk_ebd object.

Details

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_breeding, auk_complete, auk_country, auk_date, auk_distance, auk_duration, auk_filter, auk_last_edited, auk_project, auk_protocol, auk_species, auk_state, auk_time

Examples

# NOT RUN {
# fliter to locations roughly in the Pacific Northwest
system.file("extdata/ebd-sample.txt", package = "auk") %>%
  auk_ebd() %>%
  auk_extent(extent = c(-125, 37, -120, 52))
  
# alternatively, without pipes
ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
auk_extent(ebd, extent = c(-125, 37, -120, 52))
# }