The purpose of this is to permit plotting with xtype="spine", so that the section plot will display the distance of stations projected onto the spine.

addSpine(section, spine, debug = getOption("oceDebug"))

## Arguments

section a section object. either a list or a data frame, containing numeric items named longitude and latitude, defining a path along the spine. an integer specifying whether debugging information is to be printed during the processing. This is a general parameter that is used by many oce functions. Generally, setting debug=0 turns off the printing, while higher values suggest that more information be printed. If one function calls another, it usually reduces the value of debug first, so that a user can often obtain deeper debugging by specifying higher debug values.

## Value

A section object with a spine added.

## Examples

library(oce)
data(section)
sectionWest <- subset(section, longitude < -60)
spine <- list(longitude=c(-74.5, -69.2, -55), latitude=c(38.6, 36.25, 36.25))