my fitted vgm using Gaussian model ('Gau') via 'fit.variogram' in gstat looks as follows:
Here are my questions:
1)-is Gaussian model an optimal choice
2)- my coordinates which I use for variogram fitting is in (lat, long), should I use UTM instead?
3)- does the general variogram look visually correct , i.e., nugget, sill, and range values?