for a globe with a diameter of 2.5 M is a circumference of 7.85 Meters
a base image like the one above with a size of 5400x2700 pixels is 687.89 px/M or 6.8789 pixels per CM
might be a bit too low resolution ??? maybe
netppm
http://netpbm.sourceforge.net/
should be installed by default on every linux and apple computer and maybe on windows ( postcstipt can use it in printing )
remapping it into 12 Gores ( or 24 )
-- convert the png ( portable network graphics ) to a ppm ( portable pixel map )
Code:
ppmglobe -background=gray 12 world.oceanmask.5400x2700.ppm > 12.ppm
for a black background remove "-background=gray" from the command
-- small downsize
from there inkscape
https://inkscape.org/en/
can convert it to a SVG
autocad also should be able to import a png or a bitmaped image and save as a svg
or as a 3d mesh format say the white as one unit in mesh height higher that the black
blender can even do that and maybe even "Anam8or"
the above is the EASY part
converting that to one of the file formats that are needed for the cutter ?
the people that own the cutter should be able to do that
the above image would be basically the same as a blue-print