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 1

  1. Flajolet, P., Fusy, É., Gandouet, O., & Meunier, F. (2007). Hyperloglog: The analysis of a near-optimal cardinality estimation algorithm. Discrete Mathematics and Theoretical Computer Science, 137--156. ::: 

Last update: April 14, 2021
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