Enriching map projection diversity: An approach to fusion and distortion approximation

• gen_coords.jl: Pre-generates planar coordinate points for a series of projections and stores the results in the coords directory.
• gen_opt_coords.jl: Uses Particle Swarm Optimization to perform non-proportional scaling on a series of projections, obtaining scaling factors that result in lower distortion projections. Using these scaling factors, planar coordinate points are generated and stored in the coords-opt directory.
• fusion.jl: Performs pairwise fusion of projections from the coords and coords-opt directories using six different fusion methods and dozens of fusion coefficients.

For 220 projections in both coords and coords-opt, over 2 million new projections can be generated.

Each of the coords and coords-opt directories provides three sample projections.

• opt-results.txt contains the optimized scaling factors.
  Example:

  Projection Name	Equal-Area Projection	Distortion Before Optimization	Distortion After Optimization	X Scaling Factor	Y Scaling Factor
  moll	true	0.3856590420303463	0.3716426296273295	0.9059392884196235	1.1038267274449063

• fusion-arith-output.txt contains the arithmetic fusion results. (Results from the other five fusion methods can also be obtained using fusion.jl).
  Example: