Can OSM be used to develop a community map ?

Would I use OSM in order to develop a community map (tree survey)? For example can I use OSM as the background and then overlay local data like the results of a tree survey?
Thanks.
Stew

Yes:
http://umap.openstreetmap.fr
http://openlayers.org/
http://leafletjs.com/

We might even like to have the trees in OSM! But certainly think of Umap as the place to start.

Also look at using Field Papers as a way of collecting data : http://fieldpapers.org/.

Someone already made a map with trees on umap: http://umap.openstreetmap.fr/nl/map/1001-bomen-voor-leuven_30815#13/50.8788/4.7076