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Computationally Efficient Method for the Generation of a Digital Terrain Model From Airborne LiDAR Data Using Connected Operators

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2 Author(s)
Mongus, D. ; Fac. of Electr. Eng. & Comput. Sci., Univ. of Maribor, Maribor, Slovenia ; Zalik, B.

This paper proposes a new mapping schema, named Θ mapping, for filtering nonground objects from LiDAR data, and the generation of a digital terrain model. By extending the CSL model, Θ mapping extracts the most contrasted connected-components from top-hat scale-space and attributes them for an adaptive multicriterion filter definition. Areas of the most contrasted connected-components and the standard deviations of contained points' levels are considered for this purpose. Computational efficiency is achieved by arranging the input LiDAR data into a grid, represented by a Max-Tree. Since a constant number of passes over the grid is required, the time complexity of the proposed method is linear according to the number of grid-cells. As confirmed by the experiments, the average CPU execution time decreases by nearly 98%, while the average accuracy improves by up to 10% in comparison with the related method.

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Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of  (Volume:7 ,  Issue: 1 )