ramps (version 0.5-2)

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)

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.

See Also

genUSStateSites

Examples

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