Threshold contour without changing colormap

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Sylvia
Sylvia 2015-10-30
评论： Sylvia 2015-11-4
How can I create a threshold contour without changing an existing colormap? Here is my code:
figure(1)
hold on
m_contourf(lon,lat,(ndustaCNT)',40,'LineStyle','none');
m_contourf(lon,lat,(ndustaCNT)',[0 0],'Color','w');
m_coast('line','Color','k');
m_grid('xtick',10,'tickdir','out','yaxislocation','left','fontsize',10);
c3 = colorbar('WestOutside');
I want to keep the colormap associated with the ndustaCNT matrix but overlay a single white contour where values equal zero. When I add in the second m_contourf line, the colormap changes and I lose all the structure. Thanks for your help. - Sylvia

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回答（1 个）

Chad Greene
Chad Greene 2015-11-1
The freezeColors function on file exchange should solve this problem.
figure(1)
hold on
m_contourf(lon,lat,(ndustaCNT)',40,'LineStyle','none');
freezeColors;
m_contourf(lon,lat,(ndustaCNT)',[0 0],'Color','w');
m_coast('line','Color','k');
m_grid('xtick',10,'tickdir','out','yaxislocation','left','fontsize',10);
c3 = colorbar('WestOutside');
  1 个评论
Sylvia
Sylvia 2015-11-4
Thanks, I've used freezeColors before and it works very well between subplots, but I've never used it within a single subplot. Actually I just used m_contour rather than m_contourf to make this work:
figure(1)
hold on
m_contourf(lon,lat,(ndustaCNT)',40,'LineStyle','none');
m_contour(lon,lat,(ndustaCNT)',[0 0],'Color','w');
m_coast('line','Color','k');
m_grid('xtick',10,'tickdir','out','yaxislocation','left','fontsize',10);
c3 = colorbar('WestOutside');

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