Question$-2(50$ points$)$

a$-)(25$ points$)$ Perform simple kriging using the data given in the file "data.dat" using the GSLIB program $\text{'}$kt$3$d$\text{'}$ or any other geostatistical software. You should be performing the simple kriging for the $50501$ grid we have been working on so far. Please perform the simple kriging using a spherical variogram with no nugget contribution, a sill that is equal to the variance of the data and a correlation range of $10$ blocks. Assume that the variogram is isotropic.

b$-)(25$ points$)$ Compute the variogram for the kriging estimate that you have obtained in part$-$a$.$ You can accomplish this by using the GSLIB program "gam" or any other geostatistical software that you like. Comment on the results.