Examples of two and three dimensional plots created using marmap tools.

<p>Left panel (<b>A</b>): data from the NW Atlantic Ocean, showing the NE coast of the USA and the New England and Corner Rise seamounts chains. The blue line represents the position of two- (<b>B</b>) and three- (<b>C</b>) dimensional cross sections, the red rectangle delimiting the area covered by the belt transect. The bottom left figure (<b>D</b>) represents the NW Atlantic data as plotted with the wireframe function from package lattice <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0073051#pone.0073051-Sarkar1" target="_blank">[21]</a>, based on data imported with marmap. Right panel: map of Papua New Guinea and satellite islands (<b>E</b>; see text). The middle figure (<b>F</b>) represents the results of a least-cost path analysis around the Hawaiian islands (coastline in thick black, dark grey: 1000 m isobath, light grey 4000 m isobath; red line: path avoiding waters shallower than 1000 m, blue line: path avoiding waters shallower than 4000 m). The bottom figure (<b>G</b>) represents the results of projected surface area calculations for the bathyal and abyssal areas around the Hawaiian islands. R code is available in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0073051#pone.0073051.s001" target="_blank">File S1</a>.