Coerces a sequence of longitudes and latitudes into a GPS dataset.
This may be used when read.gps
cannot read a file, or when the
data have been manipulated.
as.gps(longitude, latitude, filename = "")
the longitude in decimal degrees, positive east of
Greenwich, or a data frame with columns named latitude
and
longitude
, in which case these values are extracted from the data
frame and the second argument is ignored.
the latitude in decimal degrees, positive north of the Equator.
name of file containing data (if applicable).
An object of gps-class
.
Other things related to gps data: [[,gps-method
,
[[<-,gps-method
, gps-class
,
plot,gps-method
, read.gps
,
summary,gps-method