You have access
Effects of Photographic Distance on Tree Crown Attributes Calculated Using UrbanCrowns Image Analysis Software
Mason F. Patterson, P. Eric Wiseman, Matthew F. Winn, Sang-mook Lee and Philip A. Araman
Arboriculture & Urban Forestry (AUF) July 2011, 37 (4) 173-179; DOI: https://doi.org/10.48044/jauf.2011.023