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A comparison of harvester head data with terrestrial laser scanner and manual measurements
Thesis (MScFor)--Stellenbosch University, 2021.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2021
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| _version_ | 1867614037409267712 |
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| access_status_str | Open Access |
| author | Kunneke, Anthonie |
| author2 | Talbot, Bruce |
| author_browse | Kunneke, Anthonie Talbot, Bruce |
| author_facet | Talbot, Bruce Kunneke, Anthonie |
| author_sort | Kunneke, Anthonie |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScFor)--Stellenbosch University, 2021. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/124009 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:45:40.057Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/124009 A comparison of harvester head data with terrestrial laser scanner and manual measurements Kunneke, Anthonie Talbot, Bruce Seifert, Thomas Stellenbosch University. Faculty of AgriScience. Dept. of Forest and Wood Science. Terrestrial laser scanning Harvesting machinery StanForD Harvesters (Machines) -- Measurements UCTD Thesis (MScFor)--Stellenbosch University, 2021. ENGLISH ABSTRACT: In South Africa data from harvesting machines are not used regularly for management information. There are reported differences between volumes in machine data files and volumes measured at the mill. The study compared harvesting machine measured stem information with measurements extracted from terrestrial laser scanner point clouds and manual measurements. The objective of the study was to provide a measure of precision to the machine collected data for use in management information. Four replications of 200 trees were used and the DBH of each tree was measured by the three methods, manual with diameter tape, TLS and machine calliper in the harvesting head. A sample of 40 trees in each replication was measured by Vertex hypsometer and an estimate of each tree height was extracted from the point cloud. The machine file only stored a merchantable length measurement which could not be compared directly with the other measurements. A significant difference was found between manual and TLS measurements with the TLS measurements showing a negative bias of about 2%. Machine measurements have a negative bias of about 8% compared to the manual measurements. TLS extracted stem information although with its own inaccuracies are without human error and it does not interact with the tree and is therefore used to quantify the error in machine measurements, especially because it can provide diameters at several heights just like the machine .stm file provides multiples at 10 cm intervals on the length of the stem. AFRIKAANSE OPSOMMING: In Suid Afrika word masjien data nie algemeen gebruik vir bestuursdoeleindes nie. Verskille in die data en metings met die hand gemaak word aangevoer as ʼn rede. Die studie het ʼn vergelyking getref tussen stam inligting verkry van ontginnings masjien lêers en laser skanderings, sowel as metings met ʼn deursneë maatband. Die doel van die studie was om die presisie van masjien data te bepaal vir bestuursdoeleindes. Vier herhalings van 200 bome is gebruik en elke boom se deursnee op borshoogte is met ʼn deursneë maatband, grond skanderings laser en die masjien se ontginningskop gemeet. In elke herhaling is ʼn monster van 40 bome met ʼn Vertex hoogtemeter gemeet en ook uit die puntdata van die skandeerder onttrek. Die masjien lêer het slegs lengte tot op bemarkbare dikte vasgelê en kon dus nie met ander metings vergelyk word nie. ʼn Beduidende verskil is gevind tussen grond skanderings metings en deursneë maatband metings met die maatband wat 2 % groter waardes aandui. Masjien metings het ʼn negatiewe afwyking van bykans 8 % in vergelyking met ander metodes getoon. Die grond laser skanderings data alhoewel dit ook eie foute mag hê, het geen interaksie met die bome self nie en is nie onderhewig aan menslike foute nie daarom kan dit dus gebruik word in plaas van hand metings om die afwykings in masjien metings te verkry. Dit het die voordeel dat dit vergelykbaar is aangesien deursneë op verskillende hoogtes in die stam verkry kan word, wat ooreenstem met metings in die .stm lêer wat metings elke 10 cm stoor vir die lengte van die stam. Masters 2021-12-08T08:06:57Z 2021-12-22T14:34:36Z 2021-12-08T08:06:57Z 2021-12-22T14:34:36Z 2021-12 Thesis http://hdl.handle.net/10019.1/124009 en_ZA Stellenbosch University 57 pages application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Terrestrial laser scanning Harvesting machinery StanForD Harvesters (Machines) -- Measurements UCTD Kunneke, Anthonie A comparison of harvester head data with terrestrial laser scanner and manual measurements |
| title | A comparison of harvester head data with terrestrial laser scanner and manual measurements |
| title_full | A comparison of harvester head data with terrestrial laser scanner and manual measurements |
| title_fullStr | A comparison of harvester head data with terrestrial laser scanner and manual measurements |
| title_full_unstemmed | A comparison of harvester head data with terrestrial laser scanner and manual measurements |
| title_short | A comparison of harvester head data with terrestrial laser scanner and manual measurements |
| title_sort | comparison of harvester head data with terrestrial laser scanner and manual measurements |
| topic | Terrestrial laser scanning Harvesting machinery StanForD Harvesters (Machines) -- Measurements UCTD |
| url | http://hdl.handle.net/10019.1/124009 |
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