Generating Public Transport Data based on Population Distributions for RDF Benchmarking

Tracking #: 1926-3139

Ruben Taelman
Pieter Colpaert
Erik Mannens
Ruben Verborgh

Responsible editor: 
Guest Editors Benchmarking Linked Data 2017

Submission type: 
Full Paper
When benchmarking RDF data management systems such as public transport route planners, system evaluation needs to happen under various realistic circumstances, which requires a wide range of datasets with different properties. For this reason, synthetic dataset generators are typically preferred over real-world datasets due to their intrinsic flexibility. Unfortunately, many synthetic dataset that are generated within benchmarks are insufficiently realistic, raising questions about the generalizability of benchmark results to real-world scenarios. In order to benchmark geospatial and temporal RDF data management systems such as route planners with sufficient external validity and depth, we designed PoDiGG, a highly configurable generation algorithm for synthetic public transport datasets with realistic geospatial and temporal characteristics comparable to those of their real-world variants. The algorithm is inspired by real-world public transit network design and scheduling methodologies. This article discusses the design and implementation of PoDiGG and validates the properties of its generated datasets. Our findings show that the generator achieves a sufficient level of realism, based on the existing coherence metric and new metrics we introduce specifically for the public transport domain. Thereby, PoDiGG provides a flexible foundation for benchmarking RDF data management systems with geospatial and temporal data.
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