Last data update: 2014.03.03
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R: Generating a Grid over a US State
genUSStateGrid | 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.
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incr |
a numeric vector of length 2 specifying the increment in
longitude and latitude.
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resolution |
a numeric vector of length 2 specifying the size of
the grid in longitude and latitude.
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Value
A data.frame:
lon |
longitude of the grid point.
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lat |
latitude of the grid point.
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id |
the id number of the county in which the grid point is located.
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county |
the name of the county in which the grid point is located.
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Author(s)
Jun Yan jun.yan@uconn.edu
See Also
genUSStateSites
Examples
mygrid <- genUSStateGrid('iowa', resolution=c(8, 4))
map('state', 'iowa')
points(mygrid)
Results
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