Define a filter for the eBird Basic Dataset (EBD) based on spatial bounding
box. 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.
auk_bbox(x, bbox)auk_ebd or auk_sampling object; reference to file created by
auk_ebd() or auk_sampling().
numeric; spatial bounding box 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.
An auk_ebd object.
This function can also work with on an auk_sampling object if the
user only wishes to filter the sampling event data.
Other filter: auk_bcr,
auk_breeding, auk_complete,
auk_country, 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
# NOT RUN {
# fliter to locations roughly in the Pacific Northwest
system.file("extdata/ebd-sample.txt", package = "auk") %>%
auk_ebd() %>%
auk_bbox(bbox = c(-125, 37, -120, 52))
# alternatively, without pipes
ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk"))
auk_bbox(ebd, bbox = c(-125, 37, -120, 52))
# }
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