def plot_topo_big():
    figure(figsize=(8,12))
    topo1 = topotools.Topography()
    topo1.read('flat.tt2',2)
    contourf(topo1.x,topo1.y,topo1.Z,linspace(-30,20,51), extend='both')
    topo2 = topotools.Topography()
    topo2.read('hilo_flattened.tt2',2)
    contourf(topo2.x,topo2.y,topo2.Z,linspace(-30,20,51), extend='both')
    x1 = 204.90028
    x2 = 204.96509
    y1 = 19.71
    y2 = 19.95
    plot([x1,x2,x2,x1,x1],[y1,y1,y2,y2,y1],'w')
    axis('scaled')
    colorbar()