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Thinning- and tree-growth-caused changes in canopy cover and stand height and their estimation using low-density bitemporal airborne lidar measurements – a case study in hemi-boreal forests
| Content Provider | Scilit |
|---|---|
| Author | Arumäe, Tauri Lang, Mait Laarmann, Diana |
| Copyright Year | 2020 |
| Description | Repeated airborne laser scanning (ALS) measurements during leaf-on and leaf-off phenophases were studied. A 15 km × 15 km test site located in northern Estonia was used that included a reference set of stands, and 870 stands with thinning carried out before, between, and after two ALS flights. The decrease in ALS-based canopy cover estimate $(CC_{ALS}$) caused by thinning was similar for the leaf-off and leaf-on phenophases, and for different height thresholds. The point cloud height percentile $(H_{Px}$) values increased in almost all thinned stands, and the increase was present for the leaf-off and leaf-on phenophases. ALS point cloud metrics (skewness, kurtosis, mode, and canopy relief ratio) showed no response to thinning (p-value >0.05). Stand-dominating species had no significant influence on $H_{Px}$ increment or $CC_{ALS}$ change using the leaf-on data (p-value >0.05). The minimum height filter for pulse return selection had a substantial influence on $H_{Px}$ increment in stands thinned between the two ALS measurements. Ground points are usually excluded from $H_{Px}$ calculation, but for stand-level analyses, their inclusion can provide additional information. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/22797254.2020.1734969?needAccess=true |
| Ending Page | 123 |
| Page Count | 11 |
| Starting Page | 113 |
| e-ISSN | 22797254 |
| DOI | 10.1080/22797254.2020.1734969 |
| Journal | European Journal of Remote Sensing |
| Issue Number | 1 |
| Volume Number | 53 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2020-01-01 |
| Access Restriction | Open |
| Subject Keyword | Remote Sensing Change Detection Commercial Thinning Forest Management Forest Height Increment Canopy Cover Repeated Airborne Laser Scanning |
| Content Type | Text |
| Resource Type | Article |
