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Proceedings Paper

Stereo image pair's construction and accuracy analysis based on MMT soft-baseline
Author(s): Jianliang Ou; Jinhua Zhang; Bin Cao; Feng Bao; Weian Wang
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Paper Abstract

Land based mobile mapping technology (MMT) can collect spatial and attribute data in high efficiency and the data can meet the requirement of 1:2000 scale or even higher accuracy topographic mapping without ground control point. In mobile mapping, direct georeferencing by the integration of GPS and INS/DR provides the mobile platform's continuous position and pose to mapping sensor in field survey, then image stereo of the certain target is used to calculate its 3d global coordinates. But in general, current MMT image stereo is defined as the solid baseline between the different CCD cameras' relative position deviation which is rigid connected to each other and calibrated by high precise control field, and baseline length is quite short (less than 2 meters). This brings some troubles on the far distance target or big size building observation from different viewpoints, and also limits the use of huge amount of MMT measurable images. This paper presented the image stereo pair construction in soft-baseline condition, which is organized through the different imaging time and platform field place but overlapped to the certain target, thus the baseline's accuracy would be some obvious lower than the solid one. We made a brief introduction about Tongji Geo-Informatics MMT firstly, analyzed the image stereo pair from the solid-baseline, and then constructed MMT measurable image into soft-baseline stereo and due mathematical model is expressed. In the paper's experiment part, we analyzed the concrete target 3d solution with the total station, MMT image's solid-baseline stereo and the soft-baseline surveying. The calculation shows that the target 3d coordinates solution in soft-baseline has the same precision as the solid one, also meets the topographic mapping requirement of scale 1:2000. Last, the paper discussed some important influence from the change of angle of two observing bundles in photogrammetric forward intersection and the change sub-deviations of survey error vector in image space coordinate system. As conclusion, MMT soft-baseline brings more choice with target survey in the larger observing distance and good coordinate solution with the measurable MMT images.

Paper Details

Date Published: 10 November 2008
PDF: 8 pages
Proc. SPIE 7146, Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Advanced Spatial Data Models and Analyses, 714615 (10 November 2008); doi: 10.1117/12.813132
Show Author Affiliations
Jianliang Ou, Tongji Univ. (China)
Jinhua Zhang, Tongji Univ. (China)
Bin Cao, Tongji Univ. (China)
Feng Bao, Tongji Univ. (China)
Weian Wang, Tongji Univ. (China)

Published in SPIE Proceedings Vol. 7146:
Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Advanced Spatial Data Models and Analyses
Lin Liu; Xia Li; Kai Liu; Xinchang Zhang, Editor(s)

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