Multiple-Model Based Update of Belgian Reference Road Data

Abstract

ABSTRACT:This paper describes a semi-automatic system for road update based on high resolution orthophotos and 3D surface models. Potential update regions are identified by an object-wise verification of all existing database records, followed by a scene-wide detection of redevelopment regions. The proposed system combines several road detection and road verification approaches from current literature to form a more general solution. Each road detection / verification approach is realized as an independent module representing a unique road model combined with a corresponding processing strategy. The object-wise verification result of each module is formulated as a binary decision between the classes "correct road" and "incorrect road". These individual decisions are combined by Dempster-Shafer fusion, which provides tools for dealing with uncertain and incomplete knowledge about the statistical properties of the data. For each road detection / verification module a confidence function for the result is introduced that reflects the degree of correspondence of an actual test situation with an optimal situation according to the underlying road model of that module. Experimental results achieved with data from the national Belgian road database in a test site of about 134 km² demonstrate the potential of the method.

Multiple-Model Based Verification of Road Data

“…We presented the method in previous publications that where focused on the adaptation of the road extraction algorithms to the verification task with respect to particular tasks (Ziems et al, 2010(Ziems et al, , 2011a). In the current paper we focus on the fusion framework we use to combine the different approaches.…”

Approach for the Semi-Automatic Verification of 3d Building Models

“…Helmholz et al (2012), Göpfert et al (2011), Ziems et al (2011), Champion et al (2010, Gerke and Heipke (2008), Rottensteiner (2008) and Eidenbenz et al (2000). These approaches also use 3D information for the verification/update process.…”

“…The verification/update processes of 2D topographic data sets are in general semi-automatic and offer the opportunity for the human operators to reduce the time needed for the verification/update process. The approaches are often highly specialist to one specific data sources and/or object class (Göpfert et al, 2011;Ziems et al, 2011;Champion et al, 2010;Helmholz et al, 2010;Gerke and Heipke, 2008;Rottensteiner, 2008). However, 3D topographic data sets like 3D city models face new challenges.…”

“…These approaches also use 3D information for the verification/update process. For instance, Göpfert et al (2011) and Ziems et al (2011) both use 3D data sets extracted from ALS or dense image matching to verify/update 2D road vector data sets. The verification/update processes of 2D topographic data sets are in general semi-automatic and offer the opportunity for the human operators to reduce the time needed for the verification/update process.…”