Mapping

Topography/Bathymetry options
M_Map can access a 1-degree resolution global elevation database (actually,
this database is is included in the Matlab distribution, used by of
$MATLAB/toolbox/matlab/demos/earthmap.m).
A contour map of elevations at default levels can be drawn using
m_elev;
Different levels can also be specified:
m_elev('contour',LEVELS, optional contour arguments);
For example, if you want all the contours to be dark blue, use:
m_elev('contour',LEVELS,'edgecolor','b');
Filled contours are also possible:
m_elev('contourf',LEVELS, optional contourf arguments);
Finally, if you want to simply extract the elevation data for your own purposes,
[Z,LONG,LAT]=m_elev([LONG_MIN LONG_MAX LAT_MIN LAT_MAX]);
returns rectangular matrices for depths Z at locations LONG,LAT.