ent -- Department of Economics
University of North Carolina at Chapel Hill
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Arien Lam
Dept. of Physical Geography
Utrecht University, NL
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ns in both axes, not just overall
distance, relative to
an arbitrary point on earth.
Hth, Arien
Many Thanks,
James Stegen
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drs. H.A. (Arien) Lam (Ph.D. student)
Department of Physical Geography
Faculty of Geosciences
Utrecht University
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drs. H.A. (Arien) Lam (Ph.D. student)
Department of Physical Geography
Faculty of Geosciences
Utrecht University, The Netherlands
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For geographical coordinates, start with:
https://stat.ethz.ch/pipermail/r-sig-geo/2007-September/002595.html
Cheers, Arien
zhijie zhang schreef:
> Hi all,
> How to generate the coordinates of a circle if i know its center's
> coordinates and radius?
> I want to overlay the circle with anoth
The following function does what Eric describes, if the earth's surface
is close enough to a sphere.
Roger, I'll try to document it properly for inclusion in Maptools.
Cheers, Arien
# compute the place where you end up, if you travel
# a certain distance along a great circle,
# which is uniqu
> Get a sneak peak at messages with a handy reading pane.
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PROTECTED]@cellsize[1]*(1:[EMAIL PROTECTED]@cells.dim[1])
> z <[EMAIL PROTECTED]@cellsize[2]*(1:[EMAIL PROTECTED]@cells.dim[2])
>
> y2<-grid[[drape]]
> y2[!is.na(y2)]<-as.numeric(cut( y2[!is.na(y2)],length(pal)))
> y2[is.na(y2)]<-0
>
> ylim <- r