A parallel N-dimensional Space-Filling Curve library and its application in massive point cloud management

A parallel N-dimensional Space-Filling Curve library and its application in massive point cloud management

Guan, X. (Wuhan University)
van Oosterom, P.J.M. (TU Delft OLD Department of GIS Technology)
Cheng, Bo (Wuhan University)

2018-08-15

Because of their locality preservation properties, Space-Filling Curves (SFC) have been widely used in massive point dataset management. However, the completeness, universality, and scalability of current SFC implementations are still not well resolved. To address this problem, a generic n-dimensional (nD) SFC library is proposed and validated in massive multiscale nD points management. The library supports two well-known types of SFCs (Morton and Hilbert) with an object-oriented design, and provides common interfaces for encoding, decoding, and nD box query. Parallel implementation permits effective exploitation of underlying multicore resources. During massive point cloud management, all xyz points are attached an additional random level of detail (LOD) value l. A unique 4D SFC key is generated from each xyzl with this library, and then only the keys are stored as flat records in an Oracle Index Organized Table (IOT). The key-only schema benefits both data compression and multiscale clustering. Experiments show that the proposed nD SFC library provides complete functions and robust scalability for massive points management. When loading 23 billion Light Detection and Ranging (LiDAR) points into an Oracle database, the parallel mode takes about 10 h and the loading speed is estimated four times faster than sequential loading. Furthermore, 4D queries using the Hilbert keys take about 1∼5 s and scale well with the dataset size.

Level of detail
Parallel processing
Point clouds
Space-filling curve

http://resolver.tudelft.nl/uuid:e0e7eed5-3671-469b-bd43-52dcf0f05bd8

https://doi.org/10.3390/ijgi7080327

2220-9964

ISPRS International Journal of Geo-Information, 7 (8)

Institutional Repository

journal article

© 2018 X. Guan, P.J.M. van Oosterom, Bo Cheng