I wrote a small blog post about Mapterhorn's current status and the plans on adding aerial imagery: oliverwipfli.ch/mapterhorn-u...

How geography powers Iran’s grip on the Strait of Hormuz, despite U.S. blockade Even with a U.S. blockage, geography gives Iran an edge in the Strait of Hormuz, shaping control of a vital global chokepoint.

New piece & big ol' map w/ Júlia Ledur & @emily-m-eng.bsky.social.

Learn all about the state of the Strait, and the role the geography is taking in it -> wapo.st/47ZY0Ri

We’re all crying because of… Artemis II

Also because of the current trajectory on this planet though 😭😭😭

Big hug. Sorry for your loss Geoff.

Flyer describing the workshop

👋 Seattle locals: I'm doing a reprise of my FOSS4G workshop at Seattle U next Thursday, if you are interested in web mapping, RSVP and come! www.meetup.com/maptimesea/e...

Valinor: Valhalla Meets Rust

Valhalla is my favorite routing engine. It's one of the most flexible options already. but we can make it even better! Help us build extensions that enable even more use cases and easier collaboration.

Maplibreum: like Folium - but based on Maplibre

Maplibreum: framework that makes the creation of web maps quite easy in a Python environment, making it well suited for interactive tools. Similar to Folium, but using the ever-growing MapLibre instead of Leaflet....

Why Nominatim Can't Find Hiroshima Peace Memorial Museum - and How to Fix It

Nominatim struggles with CJK place name search. Searching for "広島平和記念資料館" (Hiroshima Peace Memorial Museum) returns no results.
Its token-based search requires exact token matches and depends on complete alternative....

Making WebGL Maps Speak: Scaling Accessibility in FOSS Geospatial Pipelines for Wildfire Risk Communications

Canvas and WebGL maps fail screen reader and keyboard tests, and most teams leave it there. We didn't. This talk shares the FOSS geospatial pipeline....

Anatomy of a file

Raster, vector, point cloud: every geospatial format solves the same core problems, including linearization, chunking, compression, and metadata. Let’s build a format from scratch to see these concerns in practice.

Elevating Geospatial Cloud-Native Platforms : End-to-End Observability with Geospatial Observation Stack

This presentation introduces an open-source Geospatial Observation Stack using OpenTelemetry, Prometheus, Grafana, and Loki. We demonstrate how end-to-end tracing....

QGIS Hub: The Community Resource Ecosystem You Might Not Know About

Did you know QGIS has a community hub for sharing styles, models, 3D models, projects, processing scripts, and more? This talk introduces hub.qgis.org and the QGIS Hub Plugin....

Bridging the Language Gap: How the QGIS Brazil Community Drives Open Source Adoption in the Global South.

Discover how the QGIS Brazil community uses translation and local networking to democratize FOSS4G. This talk highlights how breaking the language barrier is essential for empowering local....

Awakening Dormant Geospatial Data: Structuring Large-Scale Government Documents with LLM

We use LLM to extract and structure geospatial data buried in 100K–1M+ PDF and Office files held by Japan's MLIT, enabling visualization, spatial analysis, and evidence-based policymaking....

How map engine optimizes your visualization

Web map engines perform dozens of optimizations to render geographic features at interactive frame rates. This talk reveals the internal mechanisms — from GPU optimization that collapse 10,000 draw calls into a handful, to zero-copy parsing pipelines....

Web-Based High-Performance Traffic Simulator: Advancing an Integrated Interaction Platform for Urban Planning Decision-Making

Building on previous research, we introduce a traffic simulation platform enhanced for real-world urban planning. By optimizing large-scale data processing....

Last day to vote for FOSS4G talk proposals! 🗾🔊
2026.foss4g.org/en/call-for-...

My talks:
- A New Approach to MapLibre Style Editing
- Teaching AI to Contribute to Open Source: Lessons from MapLibre Agent Skills

Continuing from my previous posts, I'm gonna give you a final sample of abstracts 🧵⤵️

Hahah, true story: I once bombed a job interview by being too creative on the "where would you send a fleet of food trucks" question. Clearly, if I had it to do over, this would be my answer.

Map of Apollo 16’s flight to and from the moon. The detailed diagram shows the position of thew moon and its phases, and it’s relative position to the Earth.

With Artemis II’s launch about 4 hours away, time to revisit one of my all-time favorite diagrams. NASA published a series of Translunar/Transearth Trajectory Plotting Charts in the Apollo era, but otherwise I know nothing about them! Search mostly links to auction sites. #artemis #moon #dataviz

Haha where to park is right, with these gas prices, amirite?

What Could Possibly Go Wrong? A Practical Security Review of Popular Open-Source GIS Libraries

This talk shares results from a security review of widely used open‑source GIS libraries using a lightweight SAST and SBOM methodology. Attendees will learn how common patterns create risk and how....

From Legacy Data to National Standards: Preparing a Brazilian City for Federal Interoperability with FOSS4G

Caucaia's story reveals how transitioning from fragmented files to an open spatial database is transforming urban management. By adopting PostGIS and QGIS, we overcame historical....

Citizen-Driven War Memory Mapping: Enabling Non-Experts to Build Geospatial Archives with Re:Earth CMS and Visualizer

In Nagaoka, Japan, 23 citizens aged 11–70+ with no GIS experience mapped the 1945 air raid using Re:Earth, an open-source WebGIS platform. This talk explores how no-code CMS....

Beyond Shapefile: A Taxonomy of Modern Geospatial Data Formats

The geospatial ecosystem has evolved, introducing formats optimized for rendering, cloud-native access, and large-scale analytics. This talk provides a structured overview of formats including MVT, MLT, 3D Tiles, PMTiles, FlatGeobuf....

From Projects to Products: Operating Open Geospatial Data as a Regional Public Good in the Pacific

A practical look at how the Pacific Community is shifting from short‑term geospatial projects to sustainable, open data products through shared standards, regional governance, and coordinated....

Development of a Wildfire Fireline Visualization Pilot System and Its Enhancement Plan Using Open-Source GIS Technologies

This study introduces a three-dimensional GIS-based wildfire fireline visualization system developed using open-source GIS technologies. The ultimate goal....

Between coffee farmers and an EU portal: When is a polygon actually valid?

What actually constitutes a valid polygon is a question that various stakeholders have very different views on – and even open-source libraries like GEOS and S2 are far from a consensus. This talk explores....

Creating Language to Describe a Subjective Geospatial World: Development of a System for the Dynamic Generation of Mental Maps

It is well known that human behavior often follows mental maps that differ from the actual layout of the physical environment. We propose a system that quantifies these....

Drawing the Lines: Visualizing the role of climate change and urbanization shaping human-bear interactions in Japan

Japan has witnessed a surge in human-bear interactions, raising concerns about public safety and wildlife conservation.

Natural Language Querying of STAC Catalogs Using LLMs for Geospatial Visualization

This framework simplifies STAC data access by using Gemma 3 to translate natural language into queries. It automates GISTDA’s disaster data retrieval and MapLibre visualization, transforming complex....