Assessment zones, simplified and made clear for Sector x Zone.

Zones are four sectors (ocean basins Atlantic, Indian, East Pacific, West Pacific) and three zones (Mid-Latitude, High-Latitude and Continent (Antarctic-shelf)).

Examples

library(sp)
op <- par(mfrow = c(2, 1), mar = c(0,0, 0,0))
plot(aes_zone_ll, asp = 1.7); text(coordinates(aes_zone_ll), lab = 1:12)
plot(aes_zone); text(coordinates(aes_zone), lab = 1:12)
par(op)