Optimizing the Sampling Area across an Old-Growth Forest via UAV-Borne Laser Scanning, GNSS, and Radial Surveying
Bibliographic Data
| ID | 22033465 |
|---|---|
| Authors | Sebastiano Sferlazza (0000-0002-1333-7417, University of Palermo), Antonino Maltese (0000-0002-2778-4680, University of Palermo, corresponding author), Gino Dardanelli (0000-0002-8458-0676, University of Palermo), Donato Salvatore La Mela Veca (0000-0003-0921-0103, University of Palermo) |
| Year | 2022 |
| Volume | 11 |
| Issue | 3 |
| Pages | 168 |
| Publication date | 2022-03-04 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | ISPRS International Journal of Geo-Information (JOURNAL) |
| Journal identifiers | ISSN: 2220-9964 • E-ISSN: 2220-9964 |
| Publisher | MDPI AG (PUBLISHER • IT) |
| DOI | 10.3390/ijgi11030168 |
| OpenAlex | W4220835820 |
| Language | EN |
| References cited | 67 |
Aboveground biomass, volume, and basal area are among the most important structural attributes in forestry. Direct measurements are cost-intensive and time-consuming, especially for old-growth forests exhibiting a complex structure over a rugged topography. We defined a methodology to optimize the plot size and the (total) sampling area, allowing for structural attributes with a tolerable error to be estimated. The plot size was assessed by analyzing the semivariogram of a CHM model derived via UAV laser scanning, while the sampling area was based on the calculation of the absolute relative error as a function of allometric relationships. The allometric relationships allowed the structural attributes from trees’ height to be derived. The validation was based on the positioning of a number of trees via total station and GNSS surveys. Since high trees occlude the GNSS signal transmission, a strategy to facilitate the positioning was to fix the solution using the GLONASS constellation alone (showing the highest visibility during the survey), and then using the GPS constellation to increase the position accuracy (up to PDOP~5−10). The tree heights estimated via UAV laser scanning were strongly correlated (r2 = 0.98, RMSE = 2.80 m) with those measured in situ. Assuming a maximum absolute relative error in the estimation of the structural attribute (20% within this work), the proposed methodology allowed the portion of the forest surface (≤60%) to be sampled to be quantified to obtain a low average error in the calculation of the above mentioned structural attributes (≤13%)
Approximation error · Basal area · Geography · Global Positioning System · GLONASS · GNSS applications · Laser · Laser scanning · Mean squared error · Physics · Remote sensing · Statistics · Telecommunications · Variogram · Computer Science · Environmental Science · Forest Ecology and Biodiversity Studies · Forest ecology and management · Mathematics · Remote Sensing and LiDAR Applications · Forestry
| Highly cited | No |
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