World Map with bathymetry

This is a topographical map with included bathymetry (underwater topography).

I got the data from here:
https://visibleearth.nasa.gov/view.php?id=73963
https://visibleearth.nasa.gov/view.php?id=73934

I reduced the number of points to 2%, then used openScad to lay them on top of each other:

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difference(){
scale([.6, .6, .1])
surface(file = "gebco_08_rev_bath_2.png", center = true);
color("blue", 1.0)
cube(size =[300, 300, 3], center=true);
}

translate([0, 0, 9.5])
difference(){
scale([.6, .6, .1])
surface(file = "gebco_08_rev_elev_2.png", center = true);
color("blue", 1.0)
cube(size =[300, 300, .3], center=true);
}

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