Hello All,
I am having problem with semivariogram.
Say, there is three points (1,4),(2,1),(3,3). The results at this points are 50, 40 ,25.
I want to use kriging method to find the result at (2,2) point.
For this reason i will have to get the gamma values So that i can make a equation set like...
g1t,g2t, g3t indicating the gamma value corresponding to 1,2,3 point with the target point.

w1.g11+w2.g12+w3.g13=g1t
w1.g21+w2.g22+w3.g23=g2t
w1.g31+w2.g32+w3.g33=g3t

From here i need to get w1,w2 and w3.
For gamma value, spherical semivariogram can be used.(i think so, not sure)

g=c0+c1(1-1.5(d/a)+0.5(d/a)^3)

My problem is that i dont know how to get c0, c1 and a?
If anyone can help me, it will be really helpful for me. Thank you.

Thanks,
Nizam