Voxel-based attribute profiles on lidar data for land cover mapping

Florent Guiotte (1, 2) , Sébastien Lefèvre (2) , Thomas Corpetti (2, 1)

1 LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
2 OBELIX - Observation de l’environnement par imagerie complexe

This paper deals with strategies for LiDAR data analysis. While a large majority of studies first rasterize 3D point clouds onto regular 2D grids and then use 2D image processing tools for characterizing data, our work rather suggests to keep as long as possible the 3D structure by computing features on 3D data and rasterize later in the process. By this way, the vertical component is still taken into account. In practice, a voxelization step of raw data is performed in order to exploit mathematical tools defined on regular volumes. More precisely, we focus on attribute profiles that have been shown to be very efficient features to characterize remote sensing scenes. They require the computation of an underlying hierarchical structure (through a Max-Tree). Experimental results obtained on urban LiDAR data classification support the performances of this strategy compared with an early rasterization process.

Mots clés: Index Terms-LiDAR; land cover mapping; attribute profiles; max-tree; multiscale representation; voxelization

Domaines: Traitement des images [eess.IV]

Florent Guiotte, Sébastien Lefèvre, Thomas Corpetti. Voxel-based attribute profiles on lidar data for land cover mapping. IEEE International Geosciences and Remote Sensing Symposium (IGARSS), 2019, Yokohama, Japan. ⟨hal-02343963⟩