PolySet of geo-referenced polyline tow track data from a longspine thornyhead survey (2001).
Data frame consisting of 4 columns:
PID = primary polygon ID,
POS = position of each vertex within a given polyline,
= longitude coordinate, and
Y = latitude
projection = "LL",
zone = 9.
In R, the data must be loaded using the
Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
The longspine thornyhead (Sebastolobus altivelis) tow track spatial coordinates are available at the Pacific Biological Station (Fisheries and Oceans Canada, Nanaimo, BC V9T 6N7). The geo-referenced coordinates of the first 45 tows from the 2001 survey (Starr et al. 2002) are included here. Coordinates are recorded once per minute between winch lock-up and winch release.
Starr, P.J., Krishka, B.A. and Choromanski, E.M. (2002) Trawl survey for thornyhead biomass estimation off the west coast of Vancouver Island, September 15 - October 2, 2001. Canadian Technical Report of Fisheries and Aquatic Sciences 2421, 60 pp.
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