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• W3113199772 endingPage "4039" @default.
• W3113199772 startingPage "4039" @default.
• W3113199772 abstract "The measurement of forestry trials is a costly and time-consuming process. Over the past few years, unmanned aerial vehicles (UAVs) have provided some significant developments that could improve cost and time efficiencies. However, little research has examined the accuracies of these technologies for measuring young trees. This study compared the data captured by a UAV laser scanning system (ULS), and UAV structure from motion photogrammetry (SfM), with traditional field-measured heights in a series of forestry trials in the central North Island of New Zealand. Data were captured from UAVs, and then processed into point clouds, from which heights were derived and compared to field measurements. The results show that predictions from both ULS and SfM were very strongly correlated to tree heights (R2 = 0.99, RMSE = 5.91%, and R2 = 0.94, RMSE = 18.5%, respectively) but that the height underprediction was markedly lower for ULS than SfM (Mean Bias Error = 0.05 vs. 0.38 m). Integration of a ULS DTM to the SfM made a minor improvement in precision (R2 = 0.95, RMSE = 16.5%). Through plotting error against tree height, we identified a minimum threshold of 1 m, under which the accuracy of height measurements using ULS and SfM significantly declines. Our results show that SfM and ULS data collected from UAV remote sensing can be used to accurately measure height in young forestry trials. It is hoped that this study will give foresters and tree breeders the confidence to start to operationalise this technology for monitoring trials." @default.
• W3113199772 created "2020-12-21" @default.
• W3113199772 creator A5004956625 @default.
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• W3113199772 date "2020-12-10" @default.
• W3113199772 modified "2023-09-27" @default.
• W3113199772 title "An Assessment of High-Density UAV Point Clouds for the Measurement of Young Forestry Trials" @default.
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• W3113199772 doi "https://doi.org/10.3390/rs12244039" @default.
• W3113199772 hasPublicationYear "2020" @default.

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