genUSStateGrid function

Generating a Grid over a US State

This function generate a grid of points over a US state with given increment size or resolution.

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.

Returns

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

genUSStateSites

Examples

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