Filter the eBird data by spatial bounding box

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 or sf or Raster* object; 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. Alternatively, a spatial object from either the sf or raster packages can be provided and the bounding box will be extracted from this object.

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_bcr(), auk_breeding(), auk_complete(), auk_country(), auk_county(), 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

# 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: /private/var/folders/mg/qh40qmqd7376xn8qxd6hm5lwjyy0h2/T/RtmpBEc62Y/temp_libpath32473f2f276e/auk/extdata/ebd-sample.txt 
#> 
#> Output 
#>   Filters not executed
#> 
#> Filters 
#>   Species: all
#>   Countries: all
#>   States: all
#>   Counties: all
#>   BCRs: all
#>   Bounding box: Lon -125 - -120; Lat 37 - 52
#>   Years: all
#>   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
#>   Exotic Codes: all
#>   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: /private/var/folders/mg/qh40qmqd7376xn8qxd6hm5lwjyy0h2/T/RtmpBEc62Y/temp_libpath32473f2f276e/auk/extdata/ebd-sample.txt 
#> 
#> Output 
#>   Filters not executed
#> 
#> Filters 
#>   Species: all
#>   Countries: all
#>   States: all
#>   Counties: all
#>   BCRs: all
#>   Bounding box: Lon -125 - -120; Lat 37 - 52
#>   Years: all
#>   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
#>   Exotic Codes: all
#>   Complete checklists only: no