Probably the switch to OSM map data. Either the wooded areas are not
marked as such in OpenStreetMaps, or they are tagged in a way that the
data did not get loaded in the aprs.fi
map tile server.
Please compare against https://www.openstreetmap.org/
- if the trees are
not growing there, tap "Log in" or "Sign Up", then "Edit", and
plant them. :)
If they're growing on openstreetmap.org
, please provide a link to
where they are, with the coordinates in the
link, and I'll see if I can get them imported in the next DB rebuild.