Open Geodag 2026 · May 12

A Cloud Native Geo Upgrade for Spatial Data Infrastructure

Chris Holmes
An exploration of how cloud-native geospatial formats — GeoParquet, COG, PMTiles, STAC, and more — can fundamentally upgrade how Spatial Data Infrastructures work. Featuring Portolan, a new open-source framework for building serverless SDIs that are AI-first, easy to implement, infinitely scalable, low cost, and fully sovereign. Includes live demonstrations with Dutch government data and AI-powered spatial analysis.
Presentation
Slide Deck
Full presentation with interactive demos and embedded maps.
Speaker
Presenter View
Speaker notes, slide preview, and navigation controls.
Explore the demo
Portolan NL — Dutch SDI Prototype
A live, serverless data portal for the Netherlands built entirely on cloud-native formats. Browse Dutch government datasets with interactive maps, tables, and multiple visualization styles — all powered by static files on object storage, with zero servers.
portolan-sdi.github.io/portolan-nl-demo →
Tools
Cloud-Native SDI Cost Calculator
Compare storage and egress costs across Leaseweb, Hetzner, and AWS S3 for municipality, province, and national-scale SDIs.
AI-Generated Analysis Demos
Buildings in Dutch National Parks AI-generated
BAG buildings spatially joined with national park boundaries — MapLibre map and Chart.js visualizations.
Monuments in Dutch National Parks AI-generated
Rijksmonumenten heritage analysis — spatial joins, construction era charts, and interactive map with monument footprints.
Tulip Fields of the Netherlands AI-generated
Crop analysis from BRP 2025 data — tulip distribution, interactive graphs, and per-province statistics.
github.com/cholmes/open-geodag-presentation