The Shmitah workbook mentions community fruit tree mapping as a possible project. Fortunately, in Edmonton this has already been done, see https://edmontonfoodcouncil.org/2017/07/24/edmontons-edible-fruit-trees-map/. You can find the location of fruit trees on public land anywhere in the city. The map seems to need updating though.
That link above seems to be broken, but I found the map at https://www.opentreemap.org/edmonton/map/