TAG: urban canyons

Leica Offers Next-Generation Mobile Mapping Platform, Pegasus:Two

June 3, 2014By
PegasusTwo_application-O

Leica Geosystems has introduced its next generation vehicle-independent mobile mapping platform, the Pegasus:Two. By calibrating imagery and LiDAR point cloud data, the Pegasus:Two delivers highly accurate and economical geospatial data in a 360° spherical view while providing two methods for extracting data — either through LiDAR or via photogrammetry. With its enhanced sensor platform using six horizontal cameras, plus an... read more

Shadow Matching: Improved GNSS Accuracy in Urban Canyons

February 1, 2012By
Figure 8. Candidate user positions (in yellow) and true receiver positions (in red and green) in the shadow matching experimental verification.

GNSS positioning in dense urban areas is unreliable, with accuracy particularly poor in the cross-street direction. One solution is shadow matching, a new positioning technique that uses 3D building models to predict which satellites are visible from different locations and compares this with the measured satellite visibility to determine position. This article presents test results of a preliminary shadow-matching algorithm in a London urban canyon and discusses the practical implementation of the technique. read more

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