A voxel grid is a three-dimensional representation of space where the volume is divided into discrete units called voxels, similar to how pixels represent two-dimensional images. This representation is crucial for processing and analyzing 3D point clouds, as it enables efficient spatial indexing, filtering, and data reduction while preserving important geometric features. Voxel grids are commonly used in applications such as 3D mapping, object detection, and scene reconstruction in autonomous vehicles.
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