read.gps
cannot read a file, or when the
data have been manipulated.
as.gps(longitude, latitude, filename = "")
latitude
and
longitude
, in which case these values are extracted from the data
frame and the second argument is ignored.gps-class
.
gps
data: [[,gps-method
,
[[<-,gps-method
, gps-class
,
plot,gps-method
, read.gps
,
summary,gps-method