Hello,
Here is a library of gnuplot functions for cartographic projections in 2D and 3D
https github.com/tuxcell/gnuplotcartography
run
gnuplot demo1.gnu
gnuplot demo2.gnu
gnuplot demo3.gnu
And an R-package (Programming interface):
CRAN - Package Rgnuplot
https cran.r-project.org/web/packages/Rgnuplot/index.html
The R package can create maps for gnuplot from image files (jpeg, PNG, etc) or shapefiles and plot them in over a dozen cartographic projections
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