Dear List,
I am trying to use the PBSmapping package to import and plot the shoreline of
Hawaii. I am having problems importing and plotting the specific regions that I
would like to plot. Specifically, I can't get it to import the range of x
variables that I would like. I think my problem is with a variable called xoff,
but I have no idea what it is, what it does, or how I am supposed to use it.
It's default value is -360, but I have found examples in the PBSmapping web
publication of it being set to zero as well. The help files provides the
following definitions:
xlim range of X-coordinates to clip. Range should match the transform xoff.
xoff transform the X-coordinates by specified amount.
I can import certain regions of GSHH, but I don't seem to be able to limit
them like I want using xlim. If I change xoff to something besides -360 I get
different sizes of plots that are all the color I am using for land. I have the
following:
Hawaii.GSHH<- importGSHHS(GSHHfile,
xlim=c(-156.3,-155.92), ylim=c(19.45,19.5), xoff=-360)
The GSHHS shoreline data is found at:
http://www.soest.hawaii.edu/wessel/gshhs/gshhs.html
Any suggestions on what is going on?
Thanks,
Tim
Tim Clark
Department of Zoology
University of Hawaii
