怎么用matlab画地球曲线

cla reset;load topo;[x y z] = sphere(45);s = surface(x,y,z,'facecolor','texturemap','cdata',topo);set(s,'edgecolor','none','facealpha','texture','alphadata',topo);set(s,'backfacelighting','unlit');colormap(topomap1);alpha('direct');alphamap([。1;1])axis off vis3d;campos([2 13 10]);camlight;lighting gouraud;