ramps (version 0.6.18)

genUSStateGrid: 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)

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.

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.

Author

Jun Yan

See Also

genUSStateSites

Examples

mygrid <- genUSStateGrid('iowa', resolution=c(8, 4))
map('state', 'iowa')
points(mygrid)