Geographic distance from Coordinates
You may want to look at spDistsN1 in package sp:
The function returns a vector of distances between a matrix of 2D
points and a single 2D point, using Euclidean or Great Circle
distance (WGS84 ellipsoid) methods.
--
Edzer
J. Sebastian Tello wrote:
Hi everybody,
Could anyone please point into a reference where I could find how to make accurate calculations of distance between two points based on their geographic coordinates? I need to write some R code that includes this transformation, but i am not sure how to do it.
Thanks in advance for any help!
Sebastian
J. Sebasti?n Tello
Department of Biological Sciences
285 Life Sciences Building
Louisiana State University
Baton Rouge, LA, 70803
(225) 578-4284 (office and lab.)
----- Original Message ----
From: "r-sig-geo-request at stat.math.ethz.ch" <r-sig-geo-request at stat.math.ethz.ch>
To: r-sig-geo at stat.math.ethz.ch
Sent: Tuesday, April 29, 2008 5:00:02 AM
Subject: R-sig-Geo Digest, Vol 56, Issue 26
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https://stat.ethz.ch/mailman/listinfo/r-sig-geo or, via email, send a message with subject or body 'help' to r-sig-geo-request at stat.math.ethz.ch You can reach the person managing the list at r-sig-geo-owner at stat.math.ethz.ch When replying, please edit your Subject line so it is more specific than "Re: Contents of R-sig-Geo digest..." Today's Topics: 1. Changing colour gradient in Spatstat surface plot (adrian at maths.uwa.edu.au) ---------------------------------------------------------------------- Message: 1 Date: Tue, 29 Apr 2008 16:27:59 +0800 (WST) From: adrian at maths.uwa.edu.au Subject: [R-sig-Geo] Changing colour gradient in Spatstat surface plot To: r-sig-geo at stat.math.ethz.ch Cc: r.turner at auckland.ac.nz, adrian at maths.uwa.edu.au Message-ID: <41679.130.95.98.17.1209457679.squirrel at 130.95.98.17> Content-Type: text/plain;charset=iso-8859-1 Graham Smith <graham.smith at myotis.co.uk> writes: I have produced a smoothed surface plot of water depths (depths as marks) in spatstat, but the default colours are oranges and reds. How do I change these to blues. Can I redifne the colours in terrain.colors() or topo.colors(), or do I need to use rainbow(). Or is its something different all together. Yes, you can do all of these things. It is not true that the colours are hard-wired. I have tried the options I listed above , but can't get a syntax that works, and haven't found the help any help at all (not for me anyway). I presume that you are using smooth.ppp to smooth a marked point pattern, yielding a pixel image (object of class "im") which you now want to display in your chosen colours. So the relevant help file is help(plot.im) The help file explains that the argument 'col' determines the colours that will be used. See the examples in the help file, or example(plot.im). Here is an example of the whole process, starting from a marked point pattern and finishing with a colour image: library(spatstat) data(longleaf) Z <- smooth.ppp(longleaf) plot(Z) plot(Z, col=topo.colors(256)) Adrian Baddeley ------------------------------ _______________________________________________ R-sig-Geo mailing list R-sig-Geo at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo End of R-sig-Geo Digest, Vol 56, Issue 26 ***************************************** ____________________________________________________________________________________ [[elided Yahoo spam]] =Ahu06i62sR8HDtDypao8Wcj9tAcJ [[alternative HTML version deleted]] ------------------------------------------------------------------------ _______________________________________________ R-sig-Geo mailing list R-sig-Geo at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo