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Pilot study on the retrieval of DBH and diameter distribution of deciduous forest stands using cast shadows in UAV-based orthomosaics

Kattenborn, T.; Hernández, J.; Lopatin, J.; Kattenborn, G.; Fassnacht, F. E.

Abstract:
One fundamental metric to characterize trees and forest stands is the diameter at breast height (DBH). However, the vertical geometry of tree stems hampers a direct measurement by means of orthographic aerial imagery. Nevertheless, the DBH in deciduous forest stands could be measured from UAV-based imagery using the width of a stem´s cast shadow projected on the ground. Here, we compare in-situ measured DBH of 100 trees with the DBH visually interpreted from cast-shadows derived in UAV-based aerial imagery. Then, based on simulated datasets, we determine suitable DBH sampling sizes for a robust and efficient retrieval of stand diameter distributions. The UAV-based DBH estimation resulted in an r² of 0.74, RMSE of 7.61 cm, NRMSE of 12.8% and approximately unbiased results. According to our simulations it can be assumed that a sample size of 25-50 individual DBH measurements per forest stand allows estimating reliable diameter distributions. The presented pilot study gives a first insight on the potential of such an approach for operational assessments of diameter distribution in deciduous forest stands and might be particularly inter ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000088372
Veröffentlicht am 10.12.2018
Originalveröffentlichung
DOI: 10.5194/isprs-annals-IV-1-93-2018
Scopus
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Proceedingsbeitrag
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2194-9042
urn:nbn:de:swb:90-883726
KITopen-ID: 1000088372
Erschienen in 2018 ISPRS Technical Commission I Midterm Symposium on Innovative Sensing - From Sensors to Methods and Applications; Karlsruhe; Germany; 10 October 2018 through 12 October 2018. Ed.: S. Hinz
Verlag Curran, Red Hook (NY)
Seiten 93-99
Serie ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences ; 4-1
Schlagworte Forest Management, Forest Inventory, DBH, Diameter Distribution, UAV, Drones, Photogrammetry, Tree Shad
Nachgewiesen in Scopus
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