Naslov
3D image based modelling of small tufa samples using macro lens in digital very close range photogrammetry

Autori
Marić, Ivan ; Šiljeg, Ante ; Cukrov, Neven ; Roland, Vlatko ; Goreta, Gordana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, ostalo

Skup
5th Jubilee International Scientific Conference GEOBALCANICA 2019

Mjesto i datum
Sofija, Bugarska, 13.06.2019. - 14.06.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
tufa ; digital surface model (DSM) ; macro lens ; Krka National Park

Sažetak
Krka National Park is a sensitive hydrologic system, subject to different sorts of external disorder. The problem of direction exchange of tufa-forming watercourses was noticed during the uncontrolled spreading of invasive vegetation, which led to the end of tufa- forming process. In 2017 scientific project Managing and sustaining macro-vegetation in Skradinski buk – developing multicriterial model of sustained management was initiated. The main goal is achievement of sustainable conditions of tufa- formation and reactivation of extinguished watercourses. New methodological approach of tracking the dynamics of tufa-formation on the test limestone tiles with its effective surface of 25 cm² was suggested. The goal of this paper is to create high- resolution models of three samples of limestone tiles and to measure changes in the tufa precipitation. Tiles were placed within locations of extinguished watercourses. Selective removal of vegetation caused their reactivation. High-resolution models were generated for the initial condition and three- six month period. Recording of tiles was performed with a device based on method of very close-range photogrammetry. Main components were non-metric DSLR camera (Nikon D5300) and macro lens (Venus LAOWA 60mm f/2.8 2:1). Calibration was performed on a 2D chess test field. Each tile was represented with 187 high- quality photographs with resolution of 24 MP. Results showed that reactivation of tufa- formation process occurred in all of three test tiles. DSM of tufa with submillimetre resolution (<0.024 mm) and DOP of high-quality texture (<0.012 mm) were generated. Point density amounted to 179 000 points/mm². The largest growth of tufa measured in sixth-month period amounted to (> 5.5 mm), while the largest volume amounted to (> 9.06 cm³). New methodological approach enables interval tracking of the dynamics of tufa-formation and performing models of submillimetre resolution and high-quality texture.

Izvorni jezik
Engleski

Znanstvena područja
Geografija

POVEZANOST RADA