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ftemp
2004 Nov 18
4
adjusting the map of France to 1830
...daries
inside the polygons
for regions with the same ID. Is there some way I can do this in R?
Here's what I did in SAS:
*-- Fix the map of France to conform to Guerry:
- adjust the 97 current departments to correspond to the 86 in 1830
- delete those not part of France then
;
data gfrtemp;
set maps.france;
/* Corse was one dept - merge these to one area, new ID */
if id in (201, 202) then dept=200;
/* Seine et Oise (78) was cut into
Essonne (91), Val d'Oise (95) and Yvelines (78) */
else if id in (91, 95) then dept=78;
/* Seine (75) now split...