[R] User defined grid on map

Adriana Bejarano
Wed, 11 Apr 2007 19:01:28 -0000

This may be a trivial question for some of you: Is there a way to add
defined grid sizes on specific areas of a map?. I want to add 10kmx10km
grids to all California coastal counties:

"california,alameda", "california,contra costa",
"california,del norte",
"california,humboldt", "california,los angeles",
"california,marin",
"california,mendocino" ,"california,monterey",
"california,napa",
"california,orange", "california,riverside",
"california,sacramento",
"california,san benito", "california,san bernardino",
"california,san
diego" , "california,san francisco", "california,san
joaquin",
"california,san luis obispo", "california,san mateo",
"california,santa
barbara", "california,santa clara", "california,santa
cruz",
"california,siskiyou", "california,solano",
"california,sonoma",
"california,sutter", "california,trinity",
"california,ventura",
"california,yolo"