Primerjava višin iz GNSS-višinomerstva in iz DPM-ja, izdelanega z malim brezpilotnim letalnikom : diplomska naloga

Jazbec, Špela (author), Pavlovčič Prešeren, Polona (mentor), Grigillo, Dejan (co-mentor)

V diplomski nalogi primerjamo višine, pridobljene z GNSS-višinomerstvom, z višinami iz digitalnega modela površja, izdelanega z malim brezpilotnim letalnikom. Meritve so potekale v naselju Vače v okviru terenskih vaj. Koordinate točk smo na terenu pridobili z RTK-metodo izmere GNSS. Istočasno z izmero GNSS je območje preletaval brezpilotni letalnik podjetja Geavis d. o. o. S pomočjo programske opreme so v podjetju iz posnetih fotografij izdelali digitalni model površja, ki je bil predmet primerjave višin, ter ortofoto, ki smo ga uporabili pri obdelavi podatkov. GNSS-točke smo klasificirali v tri razrede: cesta, pokošen travnik, nepokošen travnik. S primerjavo obeh načinov pridobitve višine na istih točkah smo ločeno po razredih izračunali višinske razlike. Ugotovili smo, da le-te večinoma presegajo doseženo točnost določitve položajev z RTK-metodo izmere. Višinske razlike so najmanjše na pokošenem in največje na nepokošenem travniku. Iz tega lahko zaključimo, da je pri interpretaciji višin iz digitalnega modela reliefa oziroma površja, narejenega z brezpilotnim letalnikom, potrebna določena mera kritičnosti, še posebej na območjih z večjo vegetacijo.

• Language: Slovenian
• Keywords: geodezija, diplomska naloga, UNI, GIG, GNSS-izmera, višinomerstvo, brezpilotni letalniki, ortofoto, RTK - metoda izmere
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: Š. Jazbec
• Year: 2015
• Number of pages: XX, 24 str.
• PID: 20.500.12556/RUL-72594
• UDC: 528.2(043.2)
• COBISS.SI-ID: 7160417
• Publication date in RUL: 29.09.2015

Secondary language

• Language: English
• Title: Comparison of heights from GNSS levelling and from DSM, made with unmanned aerial vehicle

Abstract

In this graduation thesis heights gathered from GNSS levelling are being compared with heights from digital surface model (DSM), made with an unmanned aerial vehicle. The measurements took place in the Vače village. Points in the field were measured with the real time kinematic method of GNSS levelling. At the same time an unmanned aerial vehicle, owned by Geavis d. o. o. company, flew over the area and took photographs of it. Using their software they made a digital surface model, which we used for camparison. They also created an ortophoto to help us recognize points on site. Measured points were divided into three classes: road, mowed grassfield and unmowed grassfield. From compared heights of the same points, acquired from GNSS and DSM, for each class differences in heights were computed. They exceeded the possible accuracy of RTK-method of GNSS-levelling, with smallest differences at the mowed grassfield and biggest at the unmowed ones. Based on our results we suggest caution when using DSM height data from unmanned aerial vehicle, especially in the areas with high vegetation.

• Keywords: GNSS-levelling, unmanned aerial vehicle, matching, orthophoto, RTK surveying