1. A terrain mapping system for a machine having at least one traction device, the system comprising: a sensor associated with the machine and configured to generate a signal indicative of a position of the machine; at least one controller in communication with the sensor, the at least one controller configured to: receive the signal from the sensor; divide an area between the at least one traction device and a work surface into a plurality of virtual tracking features based on the signal and known geometry of the machine; track movement of the plurality of virtual tracking features; update an electronic terrain map of a worksite based on the movement of the plurality of virtual tracking features; and selectively adjust at least one of a size or a position of at least one of the plurality of virtual tracking features based on at least one of a traveling speed or an orientation of the machine.