harbourporpoise.csv (2.01 kB)

Harbour porpoise line transect data

dataset

posted on 2015-01-23, 00:57 authored by David MillerDavid Miller

Harbour porpoise line transect data
===================================

Data used in paper "Mixture models for distance sampling detection functions" by David L. Miller and Len Thomas. Taken from Williams and Thomas (2007) and were provided by Rob Williams.

Data are line transect observations of 68 harbour porpoise clusters (Phocoena phocoena) in British Columbia. Both distance to animal and group/cluster size were collected.

Survey details
==============

Survey design and protocol are detailed in Thomas et al 2007. Multi-species small boat surveys were conducted along the coastline of British Columbia, Canada during the summers of 2004 and 2005.

Data format
===========

Comma separated value file with one row for each of the 68 observations, each with the following 5 columns:

distance : Exact perpendicular distances to observed harbour porpoise groups in metres.
size : Number of animals observed (i.e. group/cluster size).
object : Unique observation identifier.
observer : Factor with 13 levels giving observer ID.
detected : Column of 1s indicated that the individual was observed (needed for analysis software).

References
==========

Williams, R, and L Thomas. Distribution and Abundance of Marine Mammals in the Coastal Waters of British Columbia, Canada. Journal of Cetacean Research and Management 9, no. 1 (2007): 15.

Thomas, L, R Williams, and D Sandilands. Designing Line Transect Surveys for Complex Survey Regions. Journal of Cetacean Research and Management 9, no. 1 (2007): 1.