Hi All,

I'm working on prediction analysis using Universal Kriging (UK).
I have two questions.

1) Formula in UK
   My input data are latitude and longitude and wind speed to predict wind
speed at unmeasured points.
   In this case, how do I make the formula in krige function of UK?  For
example, in meuse case, usually, formula is "log(zinc)~sqrt(dist)".

2) Distance in km
   In semivariance, how do I calculate the distance (h) in km in
semivariogram using longitude (degree) and latitude (degree)?

My data are as follows:

   Longitude Latitude Wind.Speed
1    -87.545   41.757   2.387500
2    -87.669   41.979   2.925000
3    -87.568   41.708   2.137500
4    -87.726   41.739   2.87500
5    -87.558   41.616   3.025000
6    -87.792   41.984   3.242857
7    -87.990   41.668   3.950000
8    -87.753   41.855   1.687500
9    -87.898   42.039   3.687500
10   -87.676  42.062   3.700000


Thanks,

Best Regards,
Jin

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