[R-sig-Geo] calculate distance from coordinates

[Kamran Safi]

Hi Annachiara,

This is what you are looking for, I think:

http://help.nceas.ucsb.edu/R:_Spatial

Somewhere down at the middle... 


Kamran


------------------------
Kamran Safi

Postdoctoral Research Fellow
Institute of Zoology
Zoological Society of London
Regent's Park
London NW1 4RY

http://www.zoo.cam.ac.uk/ioz/people/safi.htm

http://spatialr.googlepages.com
http://asapi.wetpaint.com


-----Original Message-----
From: r-sig-geo-bounces at stat.math.ethz.ch
[mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of Annachiara
Saguatti
Sent: 17 December 2008 13:59
To: r-sig-geo at stat.math.ethz.ch
Subject: [R-sig-Geo] calculate distance from coordinates

Hello,

I have a question which should be very simple. I have a list of long-lat
coordinates of 196 sites and I need to calculate the great circle
distance
(in miles?) between all of them. I can't find the right function
though... I
need this in order to calculate the quartiles of the distances between
all
the regions and set a cut-off distance to create a neighbor list. I have
tried the "dist" function but the output doesn't seem to be what I
expected,
because I cannot recognize the numbers I get as the distance between the
sites: they're too low (max 44.51000, but the sites are the European
regional capitals...).

Does anyone have a hint on this?

Thank you very much,
Annachiara Saguatti

	[[alternative HTML version deleted]]

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