Orientation of oblique airborne image sets - experiences from the ISPRS/EUROSDR benchmark on multi-platform photogrammetry

M. Gerke , F. Nex , F. Remondino , K. Jacobsen , J. Kremer , W. Karel , H. Hu , Wojciech Ostrowski

Abstract

During the last decade the use of airborne multi camera systems increased significantly. The development in digital camera technology allows mounting several mid- or small-format cameras efficiently onto one platform and thus enables image capture under different angles. Those oblique images turn out to be interesting for a number of applications since lateral parts of elevated objects, like buildings or trees, are visible. However, occlusion or illumination differences might challenge image processing. From an image orientation point of view those multi-camera systems bring the advantage of a better ray intersection geometry compared to nadir-only image blocks. On the other hand, varying scale, occlusion and atmospheric influences which are difficult to model impose problems to the image matching and bundle adjustment tasks. In order to understand current limitations of image orientation approaches and the influence of different parameters such as image overlap or GCP distribution, a commonly available dataset was released. The originally captured data comprises of a state-of-the-art image block with very high overlap, but in the first stage of the so-called ISPRS/EUROSDR benchmark on multi-platform photogrammetry only a reduced set of images was released. In this paper some first results obtained with this dataset are presented. They refer to different aspects like tie point matching across the viewing directions, influence of the oblique images onto the bundle adjustment, the role of image overlap and GCP distribution. As far as the tie point matching is concerned we observed that matching of overlapping images pointing to the same cardinal direction, or between nadir and oblique views in general is quite successful. Due to the quite different perspective between images of different viewing directions the standard tie point matching, for instance based on interest points does not work well. How to address occlusion and ambiguities due to different views onto objects is clearly a non-solved research problem so far. In our experiments we also confirm that the obtainable height accuracy is better when all images are used in bundle block adjustment. This was also shown in other research before and is confirmed here. Not surprisingly, the large overlap of 80/80% provides much better object space accuracy – random errors seem to be about 2-3fold smaller compared to the 60/60% overlap. A comparison of different software approaches shows that newly emerged commercial packages, initially intended to work with small frame image blocks, do perform very well.
Author M. Gerke
M. Gerke,,
-
, F. Nex
F. Nex,,
-
, F. Remondino
F. Remondino,,
-
, K. Jacobsen
K. Jacobsen,,
-
, J. Kremer
J. Kremer,,
-
, W. Karel
W. Karel,,
-
, H. Hu
H. Hu,,
-
, Wojciech Ostrowski ZFTSIP
Wojciech Ostrowski,,
- Department of Photogrammetry, Teledetection and Spatial Information Systems
Journal seriesThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 [2194-9034]
Issue year2016
VolXLI-B1
Pages185-191
Publication size in sheets0.5
ConferenceXXIII International Society for Photogrammetry and Remote Sensing Congress (XXIII ISPRS Congress), 12-07-2016 - 19-07-2016, Prague, Czechy
Keywords in EnglishOrientation, Oblique, Tie point matching, Bundle adjustment
DOIDOI:10.5194/isprsarchives-XLI-B1-185-2016
Internal identifier40/2016
Languageen angielski
File
2016_Ostrowski_i_inni_Orientation_of_oblique_40.pdf 892.41 KB
Additional file
2016_Oświadczenie_Ostrowski_i_inni_Orientation_of_oblique_40.pdf 463.76 KB
Score (nominal)15
ScoreMinisterial score [Punktacja MNiSW] = 15.0, 28-11-2017, ArticleFromJournalAndMatConf
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 15.0, 28-11-2017, ArticleFromJournalAndMatConf
Citation count*10 (2018-06-16)
Cite
Share Share

Get link to the record
msginfo.png


* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back