Roger,
Vineyard blocks are calculated by Google maps when you draw a polygon around them. If planted areas don't show up in the satellite photos, then they won't be accounted for. Teresa's GSA deck overstated reality in several cases. How could Rusty Grape have ~5 acres of vines on a 5 acre lot?
I don't have any bandwidth at the moment to work on a shape file. Maybe I'll have time later this summer.