oce (version 0.8-3)

as.coastline: Coerce data into coastline dataset

Description

Coerces a sequence of latitudes and longitudes into a coastline dataset.

Usage

as.coastline(latitude, longitude)

Arguments

latitude

the latitude in decimal degrees, positive north of the equator.

longitude

the longitude in decimal degrees, positive north of Greenwich.

Value

• An object of class "coastline" (for details, see read.coastline).

Details

This may be used when read.coastline cannot read a file, or when the data have been manipulated.

References

The NOAA site http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html is a good source for coastline data files.

See Also

The documentation for coastline-class explains the structure of coastline objects, and also outlines the other functions dealing with them.

Examples

d<-read.table("bbasin.dat",header=FALSE) # dataset not provided with oce
HH <-c(1645:2105) # main outline of Halifax Harbour
GI <-c(4866:4885) # George's Island
coastlineHalifax <- as.coastline(latitude[c(HH,GI)],longitude[c(HH,GI)]-360)