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UID:pretalx-qgis-uc2026-NBBYHH@talks.osgeo.org
DTSTART;TZID=CET:20261006T140000
DTEND;TZID=CET:20261006T143000
DESCRIPTION:Traditional GIS outputs often focus on a single map or static c
 hart\, but modern communication demands richer\, data-driven infographics 
 that combine multiple visual elements-maps\, line charts\, pie charts\, ba
 r charts\, and styled text-into publish-ready layouts. This presentation s
 hares practical techniques for building complex\, multi-page infographics 
 entirely within QGIS\, leveraging its native layout system to produce silk
 y-clean charts without the need for external graphic design software.\n\nA
 ttendees will discover how to produce publication-quality line\, pie\, and
  bar charts directly from attribute data using QGIS’s built-in tools\, l
 ayout items\, and PostGIS functions—all\, while maintaining full control
  over styling. The real challenge\, however\, lies in performance: generat
 ing multi-page infographics with dozens of data-driven elements can quickl
 y become slow and resource-intensive.\n\nTo solve this\, we will explore a
  performance-tuning strategy that distributes the data extraction workload
  across three key components of QGIS:\n\n-SQL layers: pre-aggregating and 
 filtering data at the database level to reduce processing overhead.\n\n-Mo
 del Designer: building reusable\, batch-processable models that prepare da
 ta for each page by storing required values as project variables.\n\n-Layo
 ut expressions: using dynamic expressions to pull pre-processed data direc
 tly into layout items\, avoiding repeated recalculation.\n\nBy properly di
 stributing the load\, we achieve near-instant layout refreshes even for in
 fographics with 70+ layers or thousands of data points. The session will i
 nclude live demonstrations of a real-world example.\nA sample of the outpu
 t can be viewed at\nhttps://reliefweb.int/report/syrian-arab-republic/syri
 an-arab-republic-overview-humanitarian-response-january-december-2025
DTSTAMP:20260705T222113Z
LOCATION:Hangar
SUMMARY:From Database to Print: How QGIS Delivers Complex\, Publish-Ready I
 nfographics - Mohammad Alamir Tamer
URL:https://talks.osgeo.org/qgis-uc2026/talk/NBBYHH/
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