contour3m - Project 3-D contour plot of map data

Description

The contour3m function is the same as the contourm function except that the lines for each contour level are drawn in their own horizontal plane, at the z-coordinate equal to the value of that level.

Tips

• If you use contour3m with the globe map display, the contour3m function warns. Be careful to scale the input data relative to the radius of your reference sphere.

Examples

In an ordinary axes, contour the EGM96 geoid heights as a 3-D surface with 50 levels and set the contour line color to black:

figure('Color','white')
load geoid
contour3m(geoid,geoidrefvec,50,'LineColor','black');

% Add the geoid as a surface.
hold on
geoshow(geoid,geoidrefvec,'DisplayType','surface')

% Add a title.
title('EGM96 Global Geoid Heights with 50 Contour Levels');

% View in 3-D
view(3)

In a map axes, contour the topography and bathymetry of South Asia and the northern Indian Ocean with a contour interval of 500 meters:

load topo
latlim = [ 0  50];
lonlim = [35 115];
[Z, refvec] = maptrims(topo, topolegend, latlim, lonlim);
figure('Color','white')
axesm('lambertstd','MapLatLimit', latlim, 'MapLonLimit', lonlim)
tightmap; axis off
contour3m(Z,refvec,'black','LevelStep',500)

% Add the geoid as a surface and set the colormap.
geoshow(Z,refvec,'DisplayType','surface')
demcmap(Z)

% Add a title.
title({'South Asia Topography and Bathymetry', ...
   'with 500 m Contours'});

% View in 3-D
set(gca,'DataAspectRatio',[1 1 40000])
view(3)

See Also

clabel | clabelm | clegendm | contour | contour3 | contourfm | contourm | geoshow | plot

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