MATLAB Answers

How to make land surface black using ETOPO data

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Vince Clementi
Vince Clementi on 20 Jul 2017
Edited: Carl on 25 Jul 2017
Hi All,
I'm trying to create an map using ETOPO data that shows ocean bathymetry, but blacks out anything above sea level (i.e., land). For example, the region around New Zealand. I want NZ to be entirely black, and Z to be o (sea level) to the sea floor.
So far, I can only make the land boundaries black using geoshow, but not the entire land surface.
Any ideas?

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Answers (1)

Carl
Carl on 25 Jul 2017
Edited: Carl on 25 Jul 2017
Hi Vincent. You can try setting the axes "CLim" property, and using a custom colormap. This will let you set everything above a certain Z value (elevation) to be some color (black). For example:
% After plotting your data with geoshow
clim = get(gca,'CLim');
clim(2) = 0;
set(gca,'CLim',clim)
newmap = colormap;
newmap(end,:) = [0 0 0];
colormap(newmap)
See the documentation below for more on the "CLim" property:
and using colormaps:

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