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Terenska izmera na območju gozda za oceno kakovosti višin, določenih z aerolaserskim skeniranjem : delovišče v Radovljici
Anželak, Anita (Author), Pavlovčič Prešeren, Polona (Mentor) More about this mentor... This link opens in a new window, Urbančič, Tilen (Co-mentor), Kuhar, Miran (Thesis defence commission member)

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Abstract
V diplomski nalogi smo primerjali višine točk, ki smo jih določili s terensko izmero oziroma so bile rezultat aerolaserskega skeniranja. Prvi cilj diplomske naloge je bil opredeliti kakovost višin iz aerolaserskega skeniranja na poraščenih terenih, zato smo za delovišče izbrali gozd v bližini Radovljice. Nadalje smo želeli opredeliti zmožnost določanja položaja s tehnologijo GNSS v listnatem gozdu v obdobju brez bujne vegetacije in pokazati prednost uporabe kombinirane GNSS in klasične terestrične izmere na območjih, kjer imamo težave z direktnim sprejemom signala GNSS. Hipotezo, da na območju listnatega gozda v času brez bujne vegetacije lahko določamo položaj z GNSS, za konkretno delovišče lahko potrdimo, vendar velja omeniti, da bi za to bilo potrebno izvesti precej bolj obsežne teste tudi na drugih deloviščih tekom celotnega leta. Nadalje smo ugotovili, da je ocena kakovosti določitve višin iz aerolaserskega skeniranja s terensko izmero zelo dober postopek za ugotavljanje razlik med višinami, vendar je hkrati tudi zamuden postopek, ki ga splošno ne moremo uporabljati. Uporabimo ga primerih, ko na osnovi poznavanja pomanjkljivosti delovanja tehnologije množičnega zajema podatkov že vnaprej predpostavimo slabšo kakovost določitve višin.

Language:Slovenian
Keywords:geodezija, diplomska naloga, UNI, GIG, višine točk, aerolasersko skeniranje, GNSS, klasična terestrična izmera, ovire sprejema signala GNSS
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2015
Publisher:[A. Anželak]
Number of pages:XVI, 26 str., 4 pril.
Place:Ljubljana
COBISS.SI-ID:7166049 This link opens in a new window
Views:1351
Downloads:506
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Secondary language

Language:English
Title:Terrain survey in the forest for evaluation of quality of hights from airborne laser scanning
Abstract:
The main purpose of this graduation thesis is the comparison of heights, gathered from two completely different procedures. First by aerial laser scanning and second by the terrain field work. We have evaluated the quality of heights on the specific area with high vegetation. For this reason we have decided to perform terrain work in the forest near Radovljica. Furthermore, we wanted to define the GNSS point determination ability in a deciduous forest in the period, excluding lush vegetation. By using combination of GNSS and classical terrestrial methods we have shown advantages of such positioning in the areas with problematic direct GNSS signals’ reception. In this particular case we can confirm the hypothesis, that GNSS positioning in deciduous forest is possible over the period with less vegetation. However, we emphasize that far more studies in different locations and times over the year should be performed to get a general assessment of the possibility of GNSS positioning in deciduous forests. From the results of height quality evaluation we can conclude, that heights from aerial laser scanning should be checked using different technologies, especially by terrain field work. At the same time this is a time consuming procedure that cannot be used in all cases where lidar heights are for wide area studies. Such a procedure of evaluation of quality of heights is used in cases, where a lower quality of results from aerial laser scanning due to the deficiencies of the technology itself is assumed.

Keywords:Radovljica, compraison of hights, airborne laser scanning, lidar, classical terrestrial method of survey, GNSS survey, orthometric elevation

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