Great list, and it's pretty much what serious land buyers end up checking by hand. A few are already there: elevation, whether a mapped road reaches the parcel, FEMA flood zone and wildfire hazard. Several more look doable from public data: slope (especially near the road) from the same USGS elevation model, days above 85F/below 30F from NOAA climate normals, and distance to hospitals, groceries, airports and shooting ranges from public facility datasets. Power availability is the hard one, since distribution lines mostly aren't public.

If you had to pick the three that rule a parcel in or out fastest, which would they be? That'd help me decide what to build next.