Geodetski Vestnik (Jan 2012)
Poplave septembra 2010 – obdelava nemerskih fotografij s fotogrametričnim DMR in lidarskimi podatki ; The floods of september 2010 – acquisition of data from non-metric images with photogrammetric DTM and lidar
Abstract
Leta 2010 so zaradi obilnih padavin med 16. in 19. septembrom Slovenijo zajele velike poplave. Za evidentiranje njihovega obsega so na Geografskem inštitutu Antona Melika ZRC SAZU 20. septembra 2010 izvedli terestrično snemanje s Sv. Ane nad Podpečjo, 23. septembra 2010 pa še ročno snemanje iz helikopterja. Posneta so bila poplavljena območja na Ljubljanskem barju, Radenskem polju in Dobrepolju. Terestrično snemanje je bilo izvedeno, ko so bile poplave na Ljubljanskem barju najobsežnejše, snemanje iz helikopterja pa nekaj dni kasneje, ko so že upadale. V članku je predstavljena obdelava posnetkov, ki prikazujejo poplave na Ljubljanskem barju. Snemanje je potekalo z različnimi nemerskimi fotoaparati, v prispevku pa bo podrobneje obravnavana obdelava posnetkov, narejenih z nemerskim fotoaparatom Cannon PowerShot SX10 IS. Fotoaparat je bil naknadno kalibriran, vendar rezultatov kalibracije ne moremo neposredno uporabiti, saj ne vemo, kako je bil fotoaparat nastavljen med snemanjem.Rob poplavljenega območja je bil izmerjen z interaktivno metodo orientacije posnetka na podlagi DMR. Metoda je enoslikovna in omogoča zajem 3R-podatkov že z enega samega posnetka. V članku primerjamo rezultate interaktivne orientacije, pridobljene na podlagi fotogrametrično izdelanega DMR 5 m x 5 m in lidarskih podatkov. Ovrednotena je uporabnost navedenih podatkov za 3R-zajem obsega poplav z interaktivno metodo orientacije ; In September 2010, one of the greatest floods in recent decades affected Slovenia, following intense rain between September 16th and 19th. Members of the Anton Melik Geographical Institute of the Scientific Research Centre of the Slovenian Academy of Sciences and Arts made their first terrestrial oblique imaging of the floods on Ljubljansko Barje (the Ljubljana moor) from Sv. Ana hill over Podpeč on the September 20th, 2010. The floods on the Ljubljana moor, Radensko polje and Dobrepolje were later also covered with handheld imaging made from helicopter on September 23rd, 2010. Terrestrial imaging was made in the time of the highest waters and the imaging from helicopter when the floods were retreating. The floods on Ljubljana moor around Podpeč are presented. Images made with the Canon PowerShot SX10 IS non-metric camera were used. The camera was calibrated afterwards, but the calibration data could not be used directly due to not knowing the parameters of zoom in the time of imaging.The flooding boundary was measured from the non-metric images with the interactive orientation of image on the DEM. The results of interactive orientation of non-metric images made with the photogrammetrically derived DEM with a cell size of 5 m × 5 m and LiDAR derived DEM with a cell size of 1 m × 1 m are presented. The evaluation of the method for the 3D data acquisition is also made.
