R: Read a Topo File

read.topo {oce} | R Documentation

## Read a Topo File

### Description

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

### Usage

    read.topo(file, debug = getOption("oceDebug"))

### Arguments

`file` | Name of a file containing an ETOPO-format dataset. Three types are permitted; see “Details”.
`debug` | 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.

### Details

The three permitted file types are as follows.

1. 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.

2. A NetCDF format that was once described by NOAA as "GMT NetCDF".

3. A NetCDF format that was once described by NOAA as "NetCDF".

### Value

A topo object that.

### Author(s)

Dan Kelley

### See Also

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`

### Examples

    ## Not run:
    library(oce)
    topoMaritimes <- read.topo("topoMaritimes.asc")
    plot(topographyMaritimes)

    ## End(Not run)

[Package oce version 1.7-2 Index]