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.
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.