Read a file that contains topographic data in the ETOPO dataset, as was once provided by
the NOAA website (see download.topo() for a good server for such
files. (As of May, 2020, there does not seem to be a way to download these
files from the NOAA website.)
read.topo(file, encoding = "latin1", debug = getOption("oceDebug"))A topo object.
Name of a file containing an ETOPO-format dataset. Three types are permitted; see “Details”.
ignored.
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.
library(oce)
topoMaritimes <- read.topo("topoMaritimes.asc")
plot(topographyMaritimes)
Dan Kelley
The three permitted file types are as follows.
An ascii type in which line 1 holds a label (which is ignored), whitespace, and then the number of columns in the matrix (i.e. the number of longitude values), line 2 is similar but for latitude, line 3 is similar but for the westernmost longitude, line 4 is similar but for southernmost latitude, line 5 is similar but for cell size, and lines after that hold the grid.
A NetCDF format that was once described by NOAA as "GMT NetCDF".
A NetCDF format that was once described by NOAA as "NetCDF".
Other things related to topo data:
[[,topo-method,
[[<-,topo-method,
as.topo(),
download.topo(),
plot,topo-method,
subset,topo-method,
summary,topo-method,
topo-class,
topoInterpolate(),
topoWorld