A dataset of instantaneous angler counts from aerial overflights of a Nebraska reservoir, used to demonstrate aerial survey effort estimation. Contains 16 rows representing one overflight per sampling day across an 8-week summer season (June-July 2024). Weekday and weekend counts vary realistically to produce non-trivial between-day variance in the effort estimate.
Format
A data frame with 16 rows and 3 variables:
- date
Survey date (Date class), June-July 2024.
- day_type
Day type stratum:
"weekday"or"weekend".- n_anglers
Instantaneous angler count from one aerial overflight (integer). Weekday counts range 15-40; weekend counts range 40-80.
See also
example_aerial_interviews for matching interview data,
creel_design(), add_counts(), estimate_effort()
Other "Example Datasets":
creel_counts_toy,
creel_interviews_toy,
example_aerial_glmm_counts,
example_aerial_interviews,
example_calendar,
example_camera_counts,
example_camera_interviews,
example_camera_timestamps,
example_catch,
example_counts,
example_ice_interviews,
example_ice_sampling_frame,
example_interviews,
example_lengths,
example_sections_calendar,
example_sections_counts,
example_sections_interviews
Examples
data(example_aerial_counts)
head(example_aerial_counts)
#> date day_type n_anglers
#> 1 2024-06-03 weekday 39
#> 2 2024-06-05 weekday 32
#> 3 2024-06-07 weekday 29
#> 4 2024-06-08 weekend 45
#> 5 2024-06-09 weekend 51
#> 6 2024-06-10 weekday 34
# Build a calendar from count dates and construct an aerial design
aerial_cal <- data.frame(
date = example_aerial_counts$date,
day_type = example_aerial_counts$day_type,
stringsAsFactors = FALSE
)
design <- creel_design(
aerial_cal,
date = date,
strata = day_type,
survey_type = "aerial",
h_open = 14
)
print(design)
#>
#> ── Creel Survey Design ─────────────────────────────────────────────────────────
#> Type: "aerial"
#> Date column: date
#> Strata: day_type
#> Calendar: 16 days (2024-06-03 to 2024-07-06)
#> day_type: 2 levels
#> Counts: "none"
#> Interviews: "none"
#> Sections: "none"
#>
#> ── Aerial Survey Design ──
#>
#> Hours open (h_open): 14