Maps are an important, perhaps the most important, way to look at land use issues, and the county zoning map has been principal representation of the ordinances used to protect the agricultural economy these last 45 years. Other maps are beginning to crop up in this discussion of the future of Napa county and I will start putting them all in one place here.
2017 Atlas Fire maps showing the extent, progression by day, and sequence of reopening areas to residents. The deep indentation in the upper edge of the fire line encircles the whole of the residences on the Foss Valley Plateau at the end of Soda Canyon Road
..one more find I just turned up - a map designed for wine makers that shows locations of vineyards with grapes available for purchase. Not directly helpful in any way that's obvious, but a really interesting project nonetheless.
The map below is not mine - just something I found on the internet. They might be using the free, open source dataset from David Thompson's Napa Wine Project website
which lists 1,100+ commercial wine producers in Napa. Even Draselle's place is in their list, so a lot of that may be low-impact, small places that happen to have a permit.