i just use R to compute NORTH in terms of 10^7 meters/degree and EAST as the same factor multiplied by cos(mean latitude). 

you can select the a 'pretty' version of min(LON, LAT) for your (0, 0). 

Lee De Cola, PhD, MCP. 
DATA to Insight 
LDECOLA@COMCAST.NET 
Reston, Virginia 
571 315 0577 mobile 
703 709 6972 home & fax 


----- Original Message ----- 
From: "Quets Jan" <Jan.Quets@ua.ac.be> 
To: r-sig-geo@r-project.org 
Sent: Saturday, January 15, 2011 3:34:14 PM 
Subject: [R-sig-Geo] from gps-coordinates to euclidean coordinates 


Hi all, 

is there an R function which can transform gps-coordinates to euclidean coordinates, 

given that, 

a) the earth's curvature can be neglected (eg. all points lie withing 10km from each other) 
b) only the relative coordinates matter (an arbitrary point can act as the origin of the 2 dimensional coordinate system) 

thanks, 
Jan 

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