关键词: 倒排索引, 激光雷达, LAS1.3, 全波形, 点云, 存储优化

Abstract: LAS specification version 1.3 is an exchange data format published by American Society for Photogrammetry and Remote Sensing（ASPRS） for storing LiDAR point cloud and other corresponding information, which can storage full waveform data to accommodate the development of LiDAR hardware and data applications. As an upgrade of old version of LAS, LAS1.3 format still focus on the description of point cloud data and simply attach the waveform data to the end of point records to extend the information of laser pulse return, which only provides a simple mapping mechanism to access the waveform data and cannot depict the logical relationship between the laser points and waveform, making it inconvenient to make direct access to waveforms. To solve this problem, a new data format based on inverted index technique is implemented to build an inverted mapping from waveform data packet to associated laser points, which eliminates the disorder of waveform accessing in LAS1.3 specification and degrades the complexity of waveform processing in applications. The experiment shows that the data format has other new features that LAS1.3 does not have, which increases the accessing speed of waveform information.

Key words: inverted index, LiDAR, LAS1.3, full waveform, point cloud, storage optimization