For the Auto Plane feature, the Square and Radial options in the Pattern list allow you to determine whether the hits for the plane feature are taken in a square or radial pattern.
If you select Radial, PC-DMIS will create the hits in rows coming from the plane center in a circular or radial pattern. PC-DMIS takes 360 degrees and divides it by the value in the Number of Rings box to determine the angle between each row. For example, if the Number of Rings box had 6 and your Number of Hits box had 3, PC-DMIS would generate a row of three hits every 60 degrees, for a total of 18 hits.
If you select Square, PC-DMIS will create the hits in a grid pattern about the center point of the plane. For example, if the Number of Rows box had 3 and the Number of Hits box had 4, PC-DMIS would take a total of 12 hits in a grid pattern with the plane center point at the center.