Quality assessment of DIM on oblique images (preliminary results)
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1 FACULTY OF GEODESY AND CARTOGRAPHY W A R S A W U N I V E R S I T Y O F T E C H N O L O G Y Quality assessment of DIM on oblique images (preliminary results) Wojciech Ostrowski, Krzysztof Bakuła, Zdzisław Kurczyński Warsaw University of Technology, Faculty of Geodesy and Cartography EUROSDR/ISPRS WORKSHOP ON 'OBLIQUE CAMERAS AND DENSE IMAGE MATCHING' 19-0 October 015
2 Oblique images in Poland Cities: Białystok, 7 cm, X 014 Lublin, 5 cm, X 014 Poznań, 4cm, VII 013 Gliwice, 8 cm, IV 013 Katowice, 8 cm, V 014 Łódź, 6 cm, XI 01 Kielce, 9 cm, IX 011
3 Camera IGI DigiCAMs Five cameras in maltan cross configuration Three 39 Mpixels (forward, backward, nadir) Two 50 Mpixels (sides)
4 Test fields Poznań GSD 4.5 cm (in center of forward/backward images) GSD 4.0 cm (in center of side looking images) 816 oblique images (04 each direction) 60% forward overlap 40% side overlap
5 Test fields Łódź GSD 6.0 cm (in center of forward/backward images) GSD 5.5 cm (in center of side looking images) 8000 oblique images (approx. 000 each direction) 55% forward overlap 30% side overlap
6 Test fields Katowice GSD 8.0 cm (in center of forward/backward images) GSD 7.0 cm (in center of side looking images) 16 oblique images (54 each direction) 65% forward overlap 35% side overlap
7 Reference dataset Terrestrial laser scanning Point denisty above 1 cm Cloud to cloud registration with subcentimeter accuracy Four reference dataset for each city Łodź and Poznań were measured with Topcon GLS- 000 (courtesy of TPI, Topcon Reseller) Katowice with Z+F 5006h
8 Workflow Calibrated camera Orientation in Inpho Match-AT Undistorted images Matching (Fix EO and IO) Agisoft PhotoScan Pix4D nframes SURE
9 Poznań side looking GSD ~4 cm Double overlap Point cloud from SURE
10 Poznań side looking DSM difference m 0 m PhotoScan - TLS m Pix4D - TLS SURE - TLS
11 Poznań side looking Patch (each 143 m ) statistic, relative to GSD (4 cm) 1 Model Point Spacing Patch 1 Mean STD Patch Mean STD PhotoScan Pix4D SURE
12 Poznań side looking Section
13 Poznań forward looking GSD ~4.5 cm Double and single overlap Point cloud from SURE
14 Poznań forward looking DSM difference m 0 m PhotoScan - TLS m Pix4D - TLS SURE - TLS
15 Poznań forward looking Patch (each 140 m ) statistic, relative to GSD (4.5cm) 1 Model Point Spacing Patch 1 Mean STD Patch Mean STD PhotoScan Pix4D SURE
16 Poznań forward looking Section
17 Katowice side looking GSD ~5.5 cm Single overlap Point cloud from SURE
18 Katowice side looking DSM difference m 0 m PhotoScan - TLS m Pix4D - TLS SURE - TLS
19 Katowice side looking Patch (15 m) statistic, relative to GSD (5.5 cm) 1 Model Point Spacing Patch 1 Mean STD PhotoScan Pix4D SURE
20 Katowice side looking Section PhotoScan Pix4D SURE
21 Łódź forward looking GSD ~6 cm Double overlap Point cloud from Pix4D
22 Łódź forward looking What with SURE? Point cloud from Pix4D Point cloud from SURE
23 Łódź forward looking Section PhotoScan Pix4D TLS
24 Conclusions (preliminary) Single overlap provide possibility to create 3D point cloud from oblique images. Future work Examine reason of failure with DIM in SURE on forward looking images form Łódź.
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