# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 
# set output 'pointsize.3.png'
unset border
set dummy u,v
set angles degrees
unset key
set parametric
set view 70, 40, 0.8, 1.2
set samples 32, 32
set isosamples 9, 9
set mapping spherical
set ticslevel 0
set noxtics
set noytics
set noztics
set title "3D version using spherical coordinate system" 
set urange [ -90.0000 : 90.0000 ] noreverse nowriteback
set vrange [ 0.00000 : 360.000 ] noreverse nowriteback
splot cos(u)*cos(v),cos(u)*sin(v),sin(u) with lines lt 5,      'world.dat' with lines lt 3,       'world.cor' using 1:2:(1):(5.*rand(0)) with points lt 1 pt 6 ps variable