oce (version 0.9-18)

topoWorld: Global topographic dataset at half-degree resolution

Description

Global topographic dataset at half-degree resolution, created by decimating the ETOPO5 dataset. Its longitude ranges from -179.5 to 180, and its latitude ranges from -89.5 to 90. Height is measured in metres above nominal sea level.

Usage

data(topoWorld)

source

The binary ETOPO5 dataset was downloaded in late 2009 from the NOAA website, http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO5/TOPO/ETOPO5/, decoded, decimated from 1/12th degree resolution to 1/2 degree resolution, and shifted so that longitude runs from negative to positive instead of from 0 to 360.

Details

The coarse resolution can be a problem in plotting depth contours along with coastlines in regions of steep topography. For example, near the southeast corner of Newfoundland, a 200m contour will overlap a coastline drawn with coastlineWorldFine. The solution in such cases is to download a higher-resolution topography file and create a topo object with read.topo or as.topo.

See Also

Created with as.topo.

Examples

library(oce)
data(topoWorld) 
par(mfrow=c(2,1))
plot(topoWorld, location=NULL)
imagep(topoWorld)