genUSStateGrid | R Documentation |
This function generate a grid of points over a US state with given increment size or resolution.
genUSStateGrid(state, incr = NULL, resolution = NULL)
state |
the name of a US state. |
incr |
a numeric vector of length 2 specifying the increment in longitude and latitude. |
resolution |
a numeric vector of length 2 specifying the size of the grid in longitude and latitude. |
A data.frame:
lon |
longitude of the grid point. |
lat |
latitude of the grid point. |
id |
the id number of the county in which the grid point is located. |
county |
the name of the county in which the grid point is located. |
Jun Yan jun.yan@uconn.edu
genUSStateSites
mygrid <- genUSStateGrid('iowa', resolution=c(8, 4))
map('state', 'iowa')
points(mygrid)
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