as.topo(longitude, latitude, z, filename = "")bathy object created by getNOAA.bathy() from
the marmap package; in the second case, all other arguments are ignored.read.topo.topo-class.
topo data: [[,topo-method,
[[<-,topo-method,
plot,topo-method, read.topo,
subset,topo-method,
summary,topo-method,
topo-class, topoInterpolate,
topoWorld