Skip to content

The following abbreviations are frequently used in this guide.

Abbreviation Meaning
UGC User-Generated Content
VGI Volunteered Geographic Information
LBSM/LBSN Location Based Social Media/Network
HLL HyperLogLog, an algorithm for cardinality estimation, see Flajolet et al. 2007


Flajolet, P., Fusy, E., Gandouet, O., & Meunier, F. (2007). HyperLogLog: the analysis of a near-optimal cardinality estimation algorithm. Conference on Analysis of Algorithms, AofA 07. Nancy, France.

Last update: June 18, 2020