beaked.ship: Beaked whale shipboard survey dataset from Alboran sea.

In DistanceDevelopment/hsltm: Line transect estimation with hidden state availability models

Description

Data from the 2008 & 2009 shipboard survey of bowhead whales in the Alboran sea. Sightings are real, strata and transects are made up for illustration.

Usage

beaked.ship

Format

A data frame with 81 observations on the following 12 variables.

stratum:

stratum number (a numeric vector). In this dataset this is a dummy value - just there to have something in this compulsory variable.

area:

stratum surface area (a numeric vector). In this dataset this is a dummy value - just there to have something in this compulsory variable.

transect:

transect number (a numeric vector). In this dataset this is a dummy value - just there to have something in this compulsory variable.

L:

transect length (a numeric vector). In this dataset this is a dummy value - just there to have something in this compulsory variable.

x:

perpendicular distances to detections (NA if no detection).

y:

perpendicular distances to detections (NA if no detection).

size:

size of each detected group (NA if no detection).

bf:

Beaufort sea state at the time of each detection (NA if no detection).

ht:

Observation platform height in m (NA if no detection).

object:

unique identifier for each detection (a numeric vector; NA if no detection).

Details

Test dataset that contains only detections (transects without detections have been omitted). It is one of the datasets analysed in Borchers et al. (2013).

Source

Ana Canadas.

References

Borchers, D.L., Zucchini, W., Heide-Jorgenssen, M.P., Canadas, A. and Langrock, R. 2013. Using hidden Markov models to deal with availability bias on line transect surveys. Biometrics.

Examples

 data(beaked.ship)

DistanceDevelopment/hsltm documentation built on June 21, 2019, 2:22 p.m.