| genUSStateGrid {ramps} | R Documentation |
Generating a Grid over a US State
Description
This function generate a grid of points over a US state with given increment size or resolution.
Usage
genUSStateGrid(state, incr = NULL, resolution = NULL)
Arguments
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. |
Value
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. |
Author(s)
Jun Yan jun.yan@uconn.edu
See Also
Examples
mygrid <- genUSStateGrid('iowa', resolution=c(8, 4))
map('state', 'iowa')
points(mygrid)
[Package ramps version 0.6.18 Index]