Keynote -- An approach for geosensor network optimization to support decisions at multiple Scale -- Sensors Networks and Data Steaming -- Towards Integration of Spatial Context in Building Energy Demand Assessment Supported by CityGML Energy Extension -- Three-stage Framework to Estimate Pedestrian Path by Using Signaling Data and Surveillance Video -- Mobility and Navigation -- Investigating the Navigational Behavior of Wheelchair Users in Urban Environments Using Eye Movement Data -- New Approach for Accessibility Assessment of Side-Walks for Wheelchair Users Considering the Sidewalk Traffic -- AI for Mobility Data Analytics -- Mobility Data Analytics with KNOT: the KNime mObility Toolkit -- Bus Journey Time Prediction with Machine Learning: An Empirical Experience in Two Cities -- A Novel GIS-Based Machine Learning Approach for the Classification of Multi-Motorized Transportation Modes -- Volunteered Geographic information (VGI) -- Cimemountainbot: A Telegram Bot to Collect Mountain Images and to Communicate Information With Mountain Guides -- A New Feature Matching Method for Matching OpenStreetMap Buildings with Those of Reference Dataset -- Network Analysis and Geovisualization -- Geovisualisation generation from semantic models: a state of the art -- A Heterogeneous Information Attentive Network for the Identification of Tourist Attraction Competitors -- Poly-GAN: Regularizing Polygons with Generative Adversarial Networks.

This volume LNCS 13912 constitutes the refereed proceedings of the 20th International Symposium on Web and Wireless Geographical Information Systems, W2GIS 2023, in June 12-13, 2023 in Quebec City, QC, Canada. The 9 full papers presented together with 2 short papers were carefully reviewed and selected from 14 submissions. The conference focuses on topics such as Sensors Networks and Data Steaming; Mobility and Navigation; AI for Mobility Data Analytics; Volunteered Geographic information (VGI); Network Analysis and Geovisualization.