Dissertation/ Thesis
Developing laser scanning applications for mapping and monitoring single tree characteristics for the needs of urban forestry
| العنوان: | Developing laser scanning applications for mapping and monitoring single tree characteristics for the needs of urban forestry |
|---|---|
| المؤلفون: | Tanhuanpää, Topi-Mikko Tapio |
| المساهمون: | Department of Forest Sciences, Laboratory of Forest Resources Management and Geo-information Science, Forest Health Group |
| سنة النشر: | 2018 |
| المجموعة: | Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
| مصطلحات موضوعية: | Forestry, Urban forest inventory, Urban forestry, Laser scanning, Trees outside forests |
| الوصف: | Urban forests provide various ecosystem services. However, they also require fairly intensive management, which can be supported with up-to-date tree-level data. Until recently, the data have been collected using traditional field measurements. Laser scanning (LS) techniques provide efficient means for acquiring detailed three-dimensional (3D) data from the vegetation. The objective of this dissertation was to develop methods for mapping and monitoring urban forests at tree level. In substudy I, a method (MS-STI) utilizing multiple data sources was developed for extracting tree-level attributes. The method combined airborne laser scanning (ALS), field measurements, and tree locations. The field sample was generalized using the non-parametric nearest neighbor (NN) approach. The relative root mean square error (RMSE) of diameter at breast height (DBH) varied between 18.8–33.8%. The performance of MS-STI was assessed in substudy II by applying it to an existing tree register. 88.8% of the trees were successfully detected, and the relative RMSE of DBH for the most common diameter classes varied between 21.7–24.3%. In substudy III, downed trees were mapped from a recreational forest area by detecting changes in the canopy. 97.7% of the downed trees were detected and the commission error was 10%. Species group, DBH, and volume were estimated for all downed trees using ALS metrics and existing allometric models. For the DBH, the relative RMSE was 20.8% and 34.1% for conifers and deciduous trees respectively. Finally, in substudy IV, a method utilizing terrestrial laser scanning (TLS) and tree basic density was developed for estimating tree-level stem biomass for urban trees. The relative RMSE of the stem biomass estimates varied between 8.4–10.5%. The dissertation demonstrates the applicability of LS data in assessing tree-level attributes for urban forests. The methods developed show potential in providing the planning and management of urban forests with cost-efficient and up-to-date tree-level data. |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| وصف الملف: | application/pdf |
| اللغة: | English |
| ردمك: | 978-951-651-551-2 978-951-651-550-5 951-651-551-7 951-651-550-9 |
| Relation: | Dissertationes Forestales; Tanhuanpää , T-M T 2016 , ' Developing laser scanning applications for mapping and monitoring single tree characteristics for the needs of urban forestry ' , Vantaa . https://doi.org/10.14214/df.230; http://hdl.handle.net/10138/268044; c9b0da42-9b31-4243-b65e-b591ab609f81 |
| الاتاحة: | http://hdl.handle.net/10138/268044 |
| Rights: | cc_by_nc_nd ; info:eu-repo/semantics/openAccess ; openAccess |
| رقم الانضمام: | edsbas.ED5D0F4 |
| قاعدة البيانات: | BASE |
| ردمك: | 9789516515512 9789516515505 9516515517 9516515509 |
|---|