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Maxwell's duiker camera-trap distance & video-start data

Source: R/CTDS.R
duikers.Rd

The duikers dataset is a named list of three tibbles derived from Maxwell's duiker (Philantomba maxwellii) camera trap and distance sampling data collected in Taï National Park, Côte d'Ivoire (2014), and archived as the Dryad dataset Distance sampling with camera traps (Howe et al., 2018)

Usage

duikers

Format

A named list with these tibbles: DaytimeDistances: A tibble of all Maxwell's duiker distance observations (including non peak periods) recorded at camera stations during daytime deployments. It has the following columns:

  • distance: the midpoint (m) of the assigned distance interval between animal and camera.

  • Sample.Label: camera station identifier.

  • Effort: number of active 2 second time steps the camera operated (i.e. temporal effort).

  • Region.Label: stratum name (only a single stratum in this dataset).

  • Area: study area size (km^2; in this dataset, 40.4).

  • multiplier: spatial effort: fraction of a full circle covered, based on the camera's 42 deg field of view (42/360).

  • utm.e: UTM easting (metres) of the camera station.

  • utm.n: UTM northing (metres) of the camera station.

  • object: a unique identifier for each observation

PeakDistances: A tibble with the same column structure as DaytimeDistances, but includes only observations during the species' peak activity periods (no dawn or late day records).

VideoStartTimesFullDays: A tibble of camera‑trigger times for duiker videos that were recorded on full day deployments (i.e. days without researcher visits). Columns include:

  • order: sequential order of video events at each station/day.

  • folder: local folder (e.g. "A1") for grouping videos by station or session.

  • vid.no: unique video identifier number.

  • ek.no: event key number (original trigger event id).

  • easting: UTM easting (metres) for the video event.

  • northing: UTM northing (metres) for the video event.

  • month: calendar month (1-12) of the video event.

  • day: day of the month (1-31).

  • hour: hour (24h clock) when the video started.

  • minute: minute of that hour when the video started.

  • date: Date of the record

  • time: Time of the record

  • datetime: date pasted with time

References

Howe, E. J., Buckland, S. T., Després-Einspenner, M. L., Kühl, H. S., & Buckland, S. T. (2018). Data from: Distance sampling with camera traps. doi:10.5061/dryad.b4c70