Description Usage Arguments Details Value See Also Examples
Calculate days at sea for a single fishing trip using data in the format described in the package vignette checking_data.
1 | calc_days_at_sea_trip(trip)
|
trip |
Data.frame of the trip data |
The input is a single fishing trip. The format of the data should be
checked by check_format
before calling this function
(see the package vignette checking_data for more details).
Days at sea is reported at the gear (type and mesh size), fishing area and
economic zone level. The total number of days at sea is the number of
commenced 24 hour periods.
The total number of days at sea of a trip is split equally over dates on
which fishing occurs. The effort for each fishing date is split equally over
the fishing activity on that date. Active and passive gears are treated
equally.
See the vignette calculating_fishing_effort for more details.
This function is called by calc_fishing_effort
.
A data.frame
with the days at sea by gear, fishing area
and economic zone.
See calc_fishing_effort
.
See the package vignette checking_data for data preparation
and the vignette calculating_fishing_effort for the calculation
details.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | trip1 <- data.frame(
eunr_id = "my_boat", loa = 2000, gt = 70, kw = 400,
trip_id = "trip1",
# 4 day trip
depdate = "20140718", deptime = "0615", retdate = "20140721", rettime = "1615",
# Only fish on 2 of those
fishdate = c("20140719", "20140719", "20140719", "20140719", "20140720",
"20140720", "20140720"),
gear = c("OTB","OTB","OTB","GN","OTB","GN","FPO"), gear_mesh_size = c(80,80,80,50,80,50,0),
fishing_area = "27.4.B",
economic_zone = "EU",
rectangle = c("39F0","40F0","41F0","41F0","41F0","41F0","41F0"),
stringsAsFactors = FALSE
)
das <- calc_days_at_sea_trip(trip1)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.