Satellite imagery can provide the farm level information.
However, there is no institution in the developing part of the world that has the capability to access this information. In addition remote sensed info is land surface information. For this reason, when soil scientists make farm level maps, they do it the old fashioned way by auguring and digging pits. This fantastic effort produced the database for all the global projections that we are making now. After this FAO slowly dismantled their staff and today there is only a skeleton staff left in the Land and Water Office.