Integrating terrestrial and airborne laser scanning for the assessment of single-tree attributes in Mediterranean forest stands Article Swipe
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· 2018
· Open Access
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· DOI: https://doi.org/10.1080/22797254.2018.1482733
· OA: W2885427657
The development of laser scanning technologies has gradually modified methods for forest \nmensuration and inventory. The main objective of this study is to assess the potential of \nintegrating ALS and TLS data in a complex mixed Mediterranean forest for assessing a set of \nfive single-tree attributes: tree position (TP), stem diameter at breast height (DBH), tree height \n(TH), crown base height (CBH) and crown projection area radii (CPAR). Four different point \nclouds were used: from ZEB1, a hand-held mobile laser scanner (HMLS), and from FARO® \nFOCUS 3D, a static terrestrial laser scanner (TLS), both alone or in combination with ALS. The \nprecision of single-tree predictions, in terms of bias and root mean square error, was \nevaluated against data recorded manually in the field with traditional instruments. We \nfound that: (i) TLS and HMLS have excellent comparable performances for the estimation of \nTP, DBH and CPAR; (ii) TH was correctly assessed by TLS, while the accuracy by HMLS was \nlower; (iii) CBH was the most difficult attribute to be reliably assessed and (iv) the integration \nwith ALS increased the performance of the assessment of TH and CPAR with both HMLS and \nTLS.
