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)

Arguments

x

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

bbox

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.

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

Examples

# 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))
#> Input #> EBD: /cache/auk/extdata/ebd-sample.txt #> #> Output #> Filters not executed #> #> Filters #> Species: all #> Countries: all #> States: all #> BCRs: all #> Bounding box: Lon -125 - -120; Lat 37 - 52 #> Date: all #> Start time: all #> Last edited date: all #> Protocol: all #> Project code: all #> Duration: all #> Distance travelled: all #> Records with breeding codes only: no #> Complete checklists only: no
# alternatively, without pipes ebd <- auk_ebd(system.file("extdata/ebd-sample.txt", package = "auk")) auk_bbox(ebd, bbox = c(-125, 37, -120, 52))
#> Input #> EBD: /cache/auk/extdata/ebd-sample.txt #> #> Output #> Filters not executed #> #> Filters #> Species: all #> Countries: all #> States: all #> BCRs: all #> Bounding box: Lon -125 - -120; Lat 37 - 52 #> Date: all #> Start time: all #> Last edited date: all #> Protocol: all #> Project code: all #> Duration: all #> Distance travelled: all #> Records with breeding codes only: no #> Complete checklists only: no