Filter the eBird data by checklist start time

Define a filter for the eBird Basic Dataset (EBD) based on a range of start times for the checklist. 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_time(x, start_time)

Arguments

x

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

start_time

character; 2 element character vector giving the range of times in 24 hour format, e.g. "06:30" or "16:22".

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_bbox(), 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_year()

Examples

# only keep checklists started between 6 and 8 in the morning
system.file("extdata/ebd-sample.txt", package = "auk") %>%
  auk_ebd() %>%
  auk_time(start_time = c("06:00", "08:00"))
#> Input 
#>   EBD: /usr/local/lib/R/site-library/auk/extdata/ebd-sample.txt 
#> 
#> Output 
#>   Filters not executed
#> 
#> Filters 
#>   Species: all
#>   Countries: all
#>   States: all
#>   Counties: all
#>   BCRs: all
#>   Bounding box: full extent
#>   Years: all
#>   Date: all
#>   Start time: 06:00-08:00
#>   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_time(ebd, start_time = c("06:00", "08:00"))
#> Input 
#>   EBD: /usr/local/lib/R/site-library/auk/extdata/ebd-sample.txt 
#> 
#> Output 
#>   Filters not executed
#> 
#> Filters 
#>   Species: all
#>   Countries: all
#>   States: all
#>   Counties: all
#>   BCRs: all
#>   Bounding box: full extent
#>   Years: all
#>   Date: all
#>   Start time: 06:00-08:00
#>   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