I was surprised to find that my county (Harris, TX) was one of the nine counties "most central to the overall structure of the food supply network". Not much f

I was surprised to find that my county (Harris, TX) was one of the nine counties "most central to the overall structure of the food supply network". Not much farming happens in this county, nearly zero industrial farming. In the few spots of undeveloped land a few people have some cows, mostly for tax purposes. One more thing, Harris encompasses most of the greater Houston metropolitan area. It's mostly city and suburbs. So what gives? "We did this by looking for counties with the largest number of connections to others" Ok, well there's very little farming in the surrounding counties relative to California and the corn belt. We're quite a ways from the Rio Grande valley (which does have quite a bit of farming). So this still doesn't make sense.