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. Sebastián Tello


Department of Biological Sciences
285 Life Sciences Building
Louisiana State University
Baton Rouge, LA, 70803
(225) 578-4284 (office and lab.)



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From: "r-sig-geo-request@stat.math.ethz.ch" <r-sig-geo-request@stat.math.ethz.ch>
To: r-sig-geo@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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Today's Topics:

   1. Changing colour gradient in Spatstat surface plot
      (adrian@maths.uwa.edu.au)


----------------------------------------------------------------------

Message: 1
Date: Tue, 29 Apr 2008 16:27:59 +0800 (WST)
From: adrian@maths.uwa.edu.au
Subject: [R-sig-Geo] Changing colour gradient in Spatstat surface plot
To: r-sig-geo@stat.math.ethz.ch
Cc: r.turner@auckland.ac.nz, adrian@maths.uwa.edu.au
Message-ID: <41679.130.95.98.17.1209457679.squirrel@130.95.98.17>
Content-Type: text/plain;charset=iso-8859-1

Graham Smith <graham.smith@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



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