[R-sig-Geo] Variogram estimation without spatial reference

[Gunnar Oehmichen]

Dear R-Sig-Geo list,

as part of an applied field-laboratory course, I will try to estimate 
variograms of soil-lipid contents for two meadows differing in use.

Samples were taken in the following scheme:

    Code dist      X       Y Wat mead Pair
21 B6-1  0.0 443840 5451412   B   B6    6
22 B6-1  0.5 443841 5451410   B   B6    6
23 B6-1  1.0 443843 5451410   B   B6    6
24 B6-1  2.0 443844 5451411   B   B6    6
25 B6-1  4.0 443841 5451410   B   B6    6
26 B6-1  8.0 443848 5451409   B   B6    6
...

column dist represents the distance [m] to the preceding point.

This scheme was replicated on each meadow 5 times to facilitate 
replicates of each lag (0.5, 1.0, 2.0, 4.0, 8.0). We picked a random 
point (dist = 0.0) sampled, moved a distance of 0.5 m in a random 
direction, sampled and repeated the procedure with increasing distances. 
Allthough lattitude and longitude were recorded (X and Y), I do not 
consider these values to be helpful, since the measurement error of the 
GPS device is ~ 6m, so a much coarser resolution than needed.

Results of the analysis are still missing, so no need to worry about that.

but to the point, do you know of a way to use functions like variogram() 
with this kind of data?

Thanks a lot,

Gunnar Oehmichen