Fusing Aerial Imagery with LiDAR to Detect Change

This paper from the SPIE Digital Library details a methodology for combining aerial photography with LiDAR data to automatically identify changes in the built environment. The approach relies mainly on detecting differences in roof elevations by using a double thresholding technique that seems to improve performance. The authors claim an overall accuracy of 96%.

During a visit to the Ordnance Survey in England a few years ago I was told that this kind of change detection analysis was producing significant increases in tax revenue by identifying property owners who had not obtained building permits for new structures and were therefore not being taxed.

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