Small and less expensive robot.
Farmer operates its own robot.
Farmer owns a small robot and deploys on each pasture when needed (several times during a growing season).
The first time, robot traverses the entire pasture to search for weeds. Robot degrades the weed by removing its leaves using laser.
Galileo is used to record the location of the weeds.
Weed killed with a high-voltage electric shock.
In ongoing robot deployments, stored locations of weeds are used to move from weed to weed.