surveyData: Data: Tow Information from Pacific Ocean Perch Survey

Description Usage Format Note Author(s) Source References See Also


EventData of Pacific ocean perch (POP) tow information (1966-89).




Data frame consisting of 9 columns: PID = primary polygon ID, POS = position of each vertex within a given polygon, X = longitude coordinate, Y = latitude coordinate, trip = trip ID, tow = tow number in trip, catch = catch of POP (kg), effort = tow effort (minutes), depth = fishing depth (m), and year = year of survey trip. Attributes: projection = "LL", zone = 9.


In R, the data must be loaded using the data function.


Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2008-09-03


The GFBio database, maintained at the Pacific Biological Station (Fisheries and Oceans Canada, Nanaimo, BC V9T 6N7), archives catches and related biological data from commercial groundfish fishing trips and research/assessment cruises off the west coast of British Columbia (BC).

The POP (Sebastes alutus) survey data were extracted from GFBio. The data extraction covers bottom trawl surveys that focus primarily on POP biomass estimation: 1966-89 for the central BC coast and 1970-85 for the west coast of Vancouver Island. Additionally, a 1989 cruise along the entire BC coast concentrated on the collection of biological samples. Schnute et al. (2001) provide a more comprehensive history of POP surveys including the subset of data presented here.


Schnute, J.T., Haigh, R., Krishka, B.A. and Starr, P. (2001) Pacific ocean perch assessment for the west coast of Canada in 2001. Canadian Science Advisory Secretariat, Research Document 2001/138, 90 pp.

See Also

addPoints, combineEvents, EventData, findPolys, makeGrid, plotPoints.

PBSmapping documentation built on Jan. 15, 2021, 3:41 p.m.