ices.rect: Convert ICES rectangles from or to geographical coordinates

In mapplots: Data Visualisation on Maps

Convert ICES rectangles from or to geographical coordinates

Description

ices.rect converts the names of ICES statistical rectangles into geographical coordinates (midpoints). ices.rect2 converts geographical coordinates into ICES statistical rectangles. ices.rect.lutx helper function to create a lookup table for rectangle codes along the x-axis ices.rect.luty helper function to create a lookup table for rectangle codes along the y-axis

Usage

ices.rect(rectangle)
ices.rect2(lon, lat)
ices.rect.lutx()
ices.rect.luty()

Arguments

rectangle	a character vector with the names of ices rectangles. Note that the code can cope with rectangle names that have been converted into numbers by helpful microsoft office software, e.g. "36E2" tends to be converted to 3600.
lon, lat	a vector with longitude and latitude (not neccessarily the mid-points of rectangles).

Value

ices.rect will return a data frame with the midpoints of the ICES rectangles. ices.rect2 will return a vector with the names of the ICES rectangles.

Author(s)

Hans Gerritsen

References

ICES statistical rectangles https://www.ices.dk are rectangles of 1 degree longitude x 0.5 degrees latitude. They are used for reporting of fishing effort and landings.

Examples

# rectangle names to coordinates:
ices.rect(c("36E2","3600","40D8"))

# coordinates to rectangle names:
lon <- rnorm(10,-10,2)
lat <- rnorm(10,53,1)
rect <- ices.rect2(lon,lat)
basemap(xlim=range(lon), ylim=range(lat) )
draw.rect()
points(lon,lat)
text(lon,lat,rect,cex=0.7,pos=3)

mapplots documentation built on June 26, 2025, 5:07 p.m.