Nomination. A tree owner may nominate his or her tree for inclusion in the city's heritage tree registry. For purposes of this chapter, a tree owner includes another person or entity, who, with authorization of the subject tree owner, nominates a tree for inclusion in the city's heritage tree registry. In order to nominate a tree for inclusion in the city's registry, a tree owner shall submit a nomination proposal to the city, which shall include a location map of the proposed heritage tree, a photograph of the tree, and information concerning the heritage characteristics of the tree and other information that is reasonably related to the nomination, when requested by the city.