Bilinear interpolation is used so that values will vary smoothly within a longitude-latitude grid cell. Note that the sign convention for longitude and latitude must match that in topo.

topoInterpolate(longitude, latitude, topo)

## Arguments

longitude

Vector of longitudes (in the same sign convention as used in topo).

latitude

Vector of latitudes (in the same sign convention as used in topo).

topo

A topo object.

## Value

Vector of heights giving the elevation of the earth above means sea level at the indicated location on the earth.

Other things related to topo data: [[,topo-method, [[<-,topo-method, as.topo(), download.topo(), plot,topo-method, read.topo(), subset,topo-method, summary,topo-method, topo-class, topoWorld

Dan Kelley

## Examples

library(oce)
data(topoWorld)
# "The Gully", approx. 400m deep, connects Gulf of St Lawrence with North Atlantic
topoInterpolate(45, -57, topoWorld)
#> [1] -5208.5