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Pacific Herring Locations (Centroid positions)
Herring Section and Statistical Area Boundary Maps    <<< Previous page

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     Centroid positions are center points used to plot herring spawn, catch or tag (mark-recapture) data summarized by approximately 2,000 geographical locations.   These positions were determined by the mean latitude and longitude kilometre coordinates of all recorded spawning events occurring within the geographical boundaries of each herring location.   Approximately 2,000 location names have been assigned to spawn or catch records over a 75 year period, as new spawn or catch locations became known.   Clustering and overlap of positions are a result of setting too many location assignments before the availability of spatial analysis tools.   Most location assignments utilized in the 1936 to 1992 mark-recapture database conform to the present, location coding system (see Haist and Rosenfeld 1988 or Midgley 2003) however these assignments were not geo-referenced until 1999 (Daniel et al. 1999).   See Herring Spawning Areas of BC or Herring Tagging (1936-1992) for further details or references.

Other spatial scales: stock assessment regions, statistical areas and herring sections.