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"))
Name of a file containing an ETOPO-format dataset. Three types are permitted; see “Details”.
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
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
A topo object.
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".