Comparison of UAS photogrammetric products for tree detection and characterization of coniferous stands

ABSTRACT

The use of Unmanned Aerial Systems (UAS) opens a new era for remote sensing and forest management, which requires accurate and regular quantification of resources. In this study, we propose a comprehensive workflow to detect trees and assess forest attributes in the particular context of coniferous stands in transformation from even-aged to uneven-aged stands, using UAS imagery, from data acquisition to model construction. We implement a local maxima detection to identify the tree tops, based on a fixed-radius moving window in a Canopy Height Model (CHM) and images produced from UAS surveys. To compare the contribution of different photogrammetric products, we analysed the local maxima detected from the CHM, from three image types (individual rectified and ortho-rectified images and ortho-mosaic) and from a combination of both CHM and images. The local maxima detection gave promising results, with low omission and true-positive rates of up to 89.2%. A filtering process of false positives was implemented, using a supervised classification which decreased the false positives up to 2.6%. Based on the local maxima combined with an area-based approach, we constructed models to assess top height (R ²: 83%, root mean square error [RMSE]: 5.7%), number of stems (R ²: 71%, RMSE: 28.3%), basal area (R ²: 70%, RMSE: 16.2%), volume (R ²: 69%, RMSE: 20.1%), and individual tree height (R ²: 70%, RMSE: 7.2%). Despite a suboptimal data acquisition, our simple and flexible method has yielded good results and shows great potential for application.

Acknowledgements

The authors thank Ms. Coralie Mengal, Cédric Geerts, and Alain Monseur for participating in UAS operations and collecting field data. We would like also to thank the reviewers for their very helpful comments.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors would like to acknowledge the Département de la Nature et des Forêts du Service Public de Wallonie for providing financial support through the ‘Accord-Cadre de Recherche et de Vulgarisation Forestières’ and Emmanuelle Bousson, who initiated this study.