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Možnost uporabe fotogrametrije za izmero lesne zaloge.
ID
Zaletelj, Jakob
(
Author
),
ID
Kobal, Milan
(
Mentor
)
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Abstract
Z razvojem tehnologije na področju snemanja površja postaja pridobivanje podatkov (fotogrametrija, zračno lasersko skeniranje) z daljinsko vodenimi letalniki vse bolj dostopno. V diplomskem delu se osredotočamo na uporabo fotogrametrije za izračun lesnih zalog z uporabo več različnih regresijskih modelov, kjer kot pojasnjevalne spremenljivke upoštevamo meritve dreves na terenu ter podatke, ki jih lahko pridobimo iz digitalnega modela krošenj (DMK). Terenske meritve dreves (31 vzorčnih ploskev, 454 dreves) ter zajem fotografij (542) z daljinsko vodenim letalnikom DJI M300 RTK smo opravili na Gorjancih na gozdni posesti Gorjanci–Hren v odseku 105A. Rezultati kažejo, da je modelna napoved lesne zaloge točnejša, če v modelu poleg podatkov o višini strehe sestoja iz DMK uporabimo tudi podatke terenskega merjenja na 7-arskih ploskvah (sestojna temeljnica), in sicer znaša RMSE = 22,0 m3/ha oz. 4,9 %. Če v modelu poleg podatkov o višini strehe sestoja iz DMK uporabimo tudi podatke o sestojni temeljnici, ki jo izračunamo na podlagi izmerjenih podatkov z uporabo Bitterlichove kotnoštevne metode, znaša RMSE = 74,0 m3/ha oz. 16,4 %. Če v modelni napovedi lesne zaloge upoštevamo zgolj podatke iz DMK (povprečna višina strehe sestoja, sestojni sklep), znaša RMSE 89,4 m3/ha oz. 19,9 %.
Language:
Slovenian
Keywords:
lesna zaloga
,
fotogrametrija
,
daljinsko vodeni letalniki
,
Gorjanci
Work type:
Bachelor thesis/paper
Typology:
2.11 - Undergraduate Thesis
Organization:
BF - Biotechnical Faculty
Place of publishing:
Ljubljana
Publisher:
[J. Zaletelj]
Year:
2022
PID:
20.500.12556/RUL-140948
UDC:
630*5+630*6(043.2)=163.6
COBISS.SI-ID:
122600451
Publication date in RUL:
22.09.2022
Views:
1056
Downloads:
180
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ZALETELJ, Jakob, 2022,
Možnost uporabe fotogrametrije za izmero lesne zaloge.
[online]. Bachelor’s thesis. Ljubljana : J. Zaletelj. [Accessed 17 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=140948
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Secondary language
Language:
English
Title:
Possibility to use photogrammetry for wood stock measurement.
Abstract:
With the development of surface imaging technology, data acquisition (photogrammetry, airborne laser scanning) by unmanned aerial vehicle (UAV) is becoming increasingly affordable. In this thesis, we focus on the use of photogrammetry to calculate growing stocks using several different regression models, where we consider as explanatory variables the measurements of trees in the field and the data that can be obtained from the Canopy Height Model (CHM). Field measurements of trees (31 sample plots, 454 trees) and photographs (542) were taken with a DJI M300 RTK unmanned aerial aircraft in the Gorjanci Forest Estate Gorjanci - Hren, section 105A. The results show that the model prediction of the growing stock is more accurate if the model uses field measurement data based on the 700 m2 plots (basal area) in addition to the CHM stand canopy height data, i. e. RMSE = 22.0 m3/ha or 4.9%. If the model uses, in addition to the CHM data on stand canopy height, the data on stand basal area calculated using data gathered with Bitterlich’s angle count sampling method, the result amounts to RMSE = 74.0 m3/ha, or 16.4%. If the model prediction of the growing stock takes into account only the canopy height model (CHM) (average stand canopy height, canopy closure), the RMSE is 89.4 m3/ha, or 19.9%.
Keywords:
growing stock
,
photogrammetry
,
unmanned aerial aircraft
,
Gorjanci
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