How to make land surface black using ETOPO data

Question

Vince Clementi 2017-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/349648-how-to-make-land-surface-black-using-etopo-data

编辑： Carl 2017-7-25

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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Answer 1

Carl 2017-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/349648-how-to-make-land-surface-black-using-etopo-data#answer_275498

编辑：Carl 2017-7-25

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)