#FOSS4GNL 2026 was fantastic! Two inspiring days in Groningen with 12 workshops, 41 talks and a sold‑out conference. I wrote a blog with my highlights: www.qwast-gis.com/l/foss4gnl-2... #FOSS4G #QGIS #OSGeo #OpenData #GIS

Onderweg naar #FOSS4GNL in Groningen, waar ik vandaag 3 workshops geef: 🔸️ Nieuwe #GDAL Command Line Interface 🔸️PointCloud Processing met #QGIS 🔸️GeoAI in actie Ben je er niet bij? Volg de workshops dan gratis op @gisopencourseware.bsky.social: courses.gisopencourseware.org/course/index... #OSGeoNL

Workshop Hydrological Analysis in #QGIS this morning at #foss4ge2026 Free materials at @gisopencourseware.bsky.social: courses.gisopencourseware.org

Tomorrow I’m giving my Hydrological Analysis in #QGIS workshop at #FOSS4GE 💧 👉 Follow along at #GISOCW: courses.gisopencourseware.org/course/view.... Also check out the QGIS Masterclass at the #AustralianWaterSchool: awschool.com.au/training/qgi... ‼️Use AWS-FOSS-20 for 20% off until tomorrow!

I enjoyed the "Made in Europe" track at #FOSS4GEurope today. Happy to have contributed to the discussion with my presentation about #DigitalSovereignty and #OpenSource software. Thanks @marcominghini.bsky.social & @stefanielumnitz.bsky.social for hosting such an interesting and important session!

On my way by train from Rotterdam to Timișoara for #FOSS4GE, more or less tracing the same path as the heat wave, proving even meteorology can’t resist a good #FOSS4G 😅

Watch back the #QGISOpenDay session where the Algerian #QGIS User Group was officially launched. www.youtube.com/live/6PxDgMR...

It's time for the monthly #QGISOpenDay! The new Algerian #QGIS User Group will present themselves and I'll be interviewing them. Join us at 8 am UTC. Check the programme and streaming links of QGIS Open Day here: github.com/qgis/QGIS/wi...

Public sector #GIS users, your input matters! The #QGIS Trainer Network is running an international survey on how public institutions use and teach #opensource GIS. Results will be presented at the QGIS User Conference 2026 in Laax. 👉 Take the survey: nx84716.your-storageshare.de/apps/forms/s...

Meer gratis cursussen in het Nederlands op @gisopencourseware.bsky.social: courses.gisopencourseware.org/course/index...

Vandaag staan Raymond Nijssen & ik op de HAS #GeoExperience in Den Bosch met een #QGIS stand. We geven ook een workshop over #pointcloud processing in QGIS. Niet erbij? De workshop is gratis online te volgen op @gisopencourseware.bsky.social: courses.gisopencourseware.org/course/view.... @qgis.nl

🗓Save the date: 8–9 juli! Na 9 jaar keert #FOSS4GNL terug naar Groningen, waar het in 2017 begon. Twee dagen vol #opensource geo: hands‑on workshops + een dag presentaties voor developers, toepassers, beheerders en beleidsmakers. Ideeën en helpende handen zijn welkom! #OSGeoNL @qgis.nl

I just passed 35K subscribers on my YouTube channel and I'm grateful for everyone following my open‑source geo work. 🫶🏼 But for those who prefer to avoid big tech: my videos are also published on #QwastTube, my own #PeerTube instance. ▶️ www.youtube.com/@hansvanderk... ▶️ videos.qwast-gis.com

New course at @gisopencourseware.bsky.social! Learn collecting ground truth with @merginmaps.bsky.social, use #Ai assisted segmentation with a plugin by #TerraLab and the full #remotesensing workflow with the Semi-Automatic Classification plugin in #QGIS. 🔗 courses.gisopencourseware.org

The recording of Wednesday’s webinar “QGIS 4 for Water: What’s New, What’s Next?” is now available on the YouTube channel of the #AustralianWaterSchool! With @geomenke.bsky.social, Yonas Asfaha myself. 📹 Watch it here: youtu.be/vnHxLHHz-ZQ #QGIS #GIS #FOSS4G #OSGeo

All 60 videos from #QGIS for Hydrological Applications – 2nd Edition are now in the #Fediverse on #QwastTube! 🎉 Watch the full series here: videos.qwast-gis.com/c/qgishydro #PeerTube #QGISHydro

I’m launching #QwastTube, a #PeerTube based, privacy‑friendly alternative to my YouTube channel. I’m still importing videos, but it’s already live: 👉 videos.qwast-gis.com YouTube will stay in sync for now, but I hope you’ll join me on the #fediverse.

🎉 New year, new #GIS skills! ⌨️ Learn scripting in #QGIS with my free course at @gisopencourseware.bsky.social: no complex setup, just start from QGIS. Topics: #GDAL #CLI #Python basics #PyQGIS with the Notebook plugin ✨ 👉 courses.gisopencourseware.org/course/view....

In 2025 I issued 146 official #QGIS certificates via #IHEDelft & #QWAST 🎉 Each adds €20 to QGIS ➡️ €2,920 raised! Explore trusted learning paths: 🔸 QGIS Certifying orgs: certification.qgis.org/en/ 🔸 IHE Delft: www.un-ihe.org/education 🔸 QWAST: www.qwast-gis.com/courses/ #GIS #LifeLongLearning

Today, 28 MSc students in Water & Sustainable Development at #ihedelft received the official #QGIS certificate. The winner of the theory quizzes received a signed copy of QGIS for Hydrological Applications. Congrats to all and good luck with your studies! #GIS

I was interviewed about a great new #opendata #gis layer on imperviousness in the Netherlands developed by #Friedenau Society for #KlimaatEffectAtlas. Read here: klimaatadaptatienederland.nl/actueel/actu...

This year's #30DayMapChallenge was a bit challenging due to my activities in November: 9 concerts, teaching, trips to Algeria and Morocco... Read the new blog on the #QWAST website on how I made each map. www.qwast-gis.com/l/30daymapch...

#30DayMapChallenge Day 30 – Makeover Traveling today to Marrakech 🇲🇦 for a water trade mission, so I kept it simple. I revisited my Day 2 map and turned the Schie, Coolsingel & Goudsesingel back into water bodies 💧. Stronger blue infrastructure = better climate adaptation.

#30DayMapChallenge Day 29: Raster #LiDAR DSMs often leave nodata voids at water bodies, breaking shadow modeling. For Rotterdam, I used the 0.5 m AHN4 DSM and filled gaps with my #QGIS script from the Resources Hub 👉 hub.qgis.org/scripts/4 (install via QGIS Hub plugin). 🎦 youtu.be/79yFgVLvuZM

#30DayMapChallenge Day 28: Black On this Black Friday, I found today’s theme in the depths of the Black Sea. Using the @opentopography.org DEM Downloader, I grabbed the Global Bathymetry SRTM15+ V2.1 dataset, calculated 100 m contours, and applied the Tanaka method with a style from the #QGIS Hub.

#30DayMapChallenge Day 27: Boundaries Mapped the world’s transboundary aquifers (IGRAC 2025). These underground reserves cross borders, showing water connecting us beyond geopolitics. 💧 Shared responsibility, shared future. #GIS #QGIS #WaterDiplomacy

#30DayMapChallenge Day 26: Transport 🚇 Still in Algeria, so I kept it simple: vector tiles via @maptiler.bsky.social + #OpenStreetMap in #QGIS to show public transport in Algiers. The Algiers Metro is Africa’s 2nd metro after Cairo, opened in 2011.

#30DayMapChallenge Day 25: Hexagons Busy with a water seminar organised by the Dutch embassy in Algiers, I had little time to map. So I turned to the HDX dataset of 400 m H3 hexagons and plotted the population density of the Netherlands in 2023. #GIS #QGIS #Cartography #OpenData

#30DayMapChallenge Day 24: Places and their names I mapped toponyms linked to medieval cope contracts: agreements that allowed settlers to drain and farm peatlands. Names ending in ‑cop, ‑koop, ‑kop all trace back to this hostory. The naming tradition even spread to northern Germany and Poland.

#30DayMapChallenge Day 22 – Data: #Natural Earth 🌍 ⏳ With limited time I used my own tutorial to make a population map in #QGIS. 🔗 Tutorial: courses.gisopencourseware.org/mod/book/vie... 🎥 YouTube: 👉 Symbolizing points: youtu.be/0PEZ8dUNCJk 👉 Collapsed legend: youtu.be/hxzNOf3ppbQ