Before we move on to 2D estimation, one important step is to understand the behavior of thickness, grade, and accumulation. Do they exhibit spatial correlation? One way to assess this is by comparing them using a swath plot. Below is a swath plot we generated using Spyder (Python), which I’ll be sharing in my class this August. Looking at this figure — what are your thoughts? Do you see a correlation between the variables? Do you think applying 2D estimation is necessary?