Fig.2 (IMAGE) Osaka University Caption Comparison of our proposed measurement method with field survey data. Credit © 2021 Jiaxin ZHANG et al., ISPRS International Journal of Geo-Information Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.