mapping工具箱里有自带的数据
clear;
clc;
grs80 = almanac('earth','grs80');
ax = axesm('globe', 'Geoid', grs80, 'Grid', 'on','GLineStyle','-','Gcolor', 'y');
set(ax, 'Position',[0 0 1 1]);view(3);axis equal off vis3d;
set(gcf,'Renderer','opengl');
load topo
geoshow(topo,topolegend,'DisplayType','surface');
demcmap(topo);
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