[R] Map insets and par(usr) values

[Jeff Newmiller]

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Have you played with the "usr" coordinates? Have you read the help for the par function? 
The par(usr=...) call is telling base graphics what the x and y coordinates of the corners of the graphics window should be. If you subtract the same number from x1 and x2 you will shift the inset to the right because the coordinates of the left edge of the window will be further to the left of the map and the right edge of the window will be closer to the map on the right.

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On June 8, 2014 9:29:02 PM MDT, Carly Muletz <craemuletz at gmail.com> wrote:
>This is in reference to the post here by Ray Brownrigg:
>http://r.789695.n4.nabble.com/inset-one-map-on-top-of-another-map-td3848752.html
>
>using this code with the maps package:
>
>map("state", region= "ohio", xlim=c(-85, -80), ylim=c(38, 42))
>par(usr=c(-216, -66, 24, 144))   # you should be able to 'automate'
>this
>calculation
>map("state", add=T)
>map("state", region="ohio", fill=T, add=T)
>
>*MY issue*: I can't figure out how to determine which values to specify
>for
>par(usr=c(______))
>
>I can get the values of the plot area using
>
>par("usr")
>
>But I don't know how to resize the second map or move it to another
>location. When I adjust the values specified it just seems to stretch
>the second map out.
>
>Here is a basic idea of what I am trying to do
>
>library(maps)
>map('state', xlim = c(-86.5,-74), ylim= c(32,41.25), col = "white",
>fill =
>T)
>
>par(usr=c(-216, -66, 24, 144))
>par(xpd=T)
>
>map("state",  xlim = c(-105,-70), ylim= c(25,48), add = T)
>
>---but I would like the US map to be larger and moved to the right
>
>Thanks!
>
>Carly
>
>	[[alternative HTML version deleted]]
>
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