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John Dehls

@john.dehls.net
1K followers 489 following 58 posts

Applying InSAR to landslides and other stuff at the Geological Survey of Norway (NGU). Opinions here are my own, not necessarily my employer's.

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John Dehls @john.dehls.net · 05/08/2026
Our thoughts about this are expanded in this paper, just released after the ISPRS meeting in Toronto. isprs-archives.copernicus.org/articles/XLI...
isprs-archives.copernicus.org
ISPRS-Archives - From InSAR Norway to a Global Ground Motion Service: Operational Monitoring for Disaster Risk Reduction
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John Dehls @john.dehls.net · 22/09/2025
Why are we organizing this? To push forward a new initiative: making life-saving ground motion data available worldwide, especially where it’s needed most.
Partial globe showing coverage by the European Ground Motion Service, showing dense deformation measurements. Highlights how some regions have access to life-saving data, while most of the world does not.
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John Dehls @john.dehls.net · 17/04/2026
Just under two weeks left to submit abstracts to the 7th World Landslide Forum (WLF7), to be held in India in November 2026. I’d like to draw attention to a couple of #InSAR #DRR sessions that may be of interest: wlf7.org/themes-sessi...
Poster showing that the 7th World Landslide Forum abstract submission deadline has been extended to April 30, 2026.
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John Dehls @john.dehls.net · 15/04/2026
Nice summary of our new #InSAR Svalbard service by the Norwegian Space Agency (in Norwegian). Still just five pilot areas but we are scaling up to the full territory over the next years. romdirektoratet.no/aktuelt/insa...
romdirektoratet.no
Viser bakkebevegelser på Svalbard
InSAR Svalbard viser hvor mye grunnen beveger seg når permafrosten tiner.
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The Barents Observer @thebarentsobserver.com · 08/04/2026
Svalbard’s cultural heritage and infrastructure face increasing risks as climate change accelerates permafrost thaw and ground instability. Partner story by the Fram Centre
thebarentsobserver.com
Permafrost thaw threatens Svalbard’s cultural heritage and modern buildings
Svalbard’s cultural heritage and infrastructure face increasing risks as climate change accelerates permafrost thaw and ground instability. The PermaRICH project unites experts across disciplines to e...
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John Dehls @john.dehls.net · 17/03/2026
I have a joke about InSAR but it's only funny after unwrapping.
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John Dehls @john.dehls.net · 02/03/2026
This is a big one, literally. New paper out in Geomorphology: we use multi-geometry Sentinel-1 InSAR to unravel the internal kinematic segmentation of a 55 km² deep-seated landslide in the NW Himalaya. www.sciencedirect.com/science/arti... #DRR #InSAR #Sentinel-1 #landslide
Fig. 9. Conceptual and geological framework relevant to slope deformation at the Leo Pargil Dome. (a) Conceptual scheme illustrating gravity-driven zones of extension and compression on a steep ridge, after Savage and Varnes (1987). (b) Simplified geological cross-section and block diagram of the Leo Pargil Dome, showing the regional structural architecture and extensional setting, after Thiede et al. (2006). (c) Northwest-oriented geological cross-section across the western flank of the Leo Pargil Dome at the latitude of Nako village, highlighting major lithological units and extensional structures, after Langille et al. (2012).Fig. 6. Decomposition of LOS velocities into 2D displacement rates using an extended colour scale. (a) East–west horizontal and (b) vertical velocity fields inverted from paired Sentinel-1 ascending and descending LOS velocity fields (2018–2023).Fig. 5. Decomposition of LOS velocities into 2D displacement rates using a narrow colour scale. (a) East–west horizontal and (b) vertical velocity fields inverted from paired Sentinel-1 ascending and descending LOS velocity fields (2018–2023).
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John Dehls @john.dehls.net · 04/01/2026
Hey #inuitart experts. I purchased this qiviut wall hanging in Yellowknife in 1993. It used to have a tag on it with the name of the artist, as well as the community she came from, but it is lost. I would very much like to know more about the artist. Does anyone recognise the signature or the style?
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John Dehls @john.dehls.net · 04/11/2025
⏰ Deadline extended! The #ISPRS2026 abstract submission deadline is now 17 November. Check out our Special Session on Cooperation on Ground Motion Monitoring for DRR & Resilience 👇 www.isprs2026toronto.com/special-sess... #InSAR #DisasterRiskReduction #ISPRS2026
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AnneliiD @anneliid.bsky.social · 15/10/2025
Full of leading scientific institutions, Trondheim could be a natural laboratory for world-class collective transport. But progress remains constrained by car-centric policies that support electried, privately-owned cars. The thinking: Green cars = Green economic growth. A cosmetic solution.
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John Dehls @john.dehls.net · 13/10/2025
On this International Day for Disaster Risk Reduction, iddrr.undrr.org, I'd like to call attention once again to our idea of an InSAR-based global ground motion service, and our upcoming special session at ISPRS in Toronto. Abstract deadline is Nov 3. www.isprs2026toronto.com/special-sess...
iddrr.undrr.org
International Day for Disaster Risk Reduction (IDDRR)
Financing is the single challenge that unites the disaster, climate, development, and humanitarian domains. The unique advantage of disaster risk reduction is that it can simultaneously strengthen all the other domains, because of its emphasis on reducing vulnerabilities and building resilience.
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AnneliiD @anneliid.bsky.social · 29/09/2025
Consume less, live more. #voluntarysimplicity share.google/bAcEduwe30I6...
share.google
Forget materialism, a simple life is happier: research
In an age where billionaires and conspicuous consumption are increasingly on display, new Otago-led research shows a simple life really is a happier life.
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John Dehls @john.dehls.net · 22/09/2025
We had tremendous response to our initiative for a Global Ground Motion Service at #GP2025 this spring. The technology is proven. The data exists. Let's go global. x.com/NorwayInGene...
x.com
Norway in Geneva 🇳🇴 on X: "🎥 “We need global cooperation to build local resilience.” Deputy Minister @stinerenate shares why 🇳🇴 Norway is at #GP2025 – and what matters most: early warning, inclusive risk governance, and financing that reaches those most at risk @NorwayMFA @NorwayUN @DSB_no @UNDRR https://t.co/TzKJeMAhJD" / X
🎥 “We need global cooperation to build local resilience.” Deputy Minister @stinerenate shares why 🇳🇴 Norway is at #GP2025 – and what matters most: early warning, inclusive risk governance, and financing that reaches those most at risk @NorwayMFA @NorwayUN @DSB_no @UNDRR https://t.co/TzKJeMAhJD
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John Dehls @john.dehls.net · 22/09/2025
From earlier this year at #GP2025: x.com/NorwayInGene...
x.com
Norway in Geneva 🇳🇴 on X: "“Innovation is key to the future – and early warning saves lives.” 🌍🔔 Our UN ambassador @NorwayAmbUNOG visited @Romsenteret & Geological Survey of Norway`s booth at #GP2025 to learn about Norwegian innovations that can support global efforts in early warning and early action https://t.co/JaFdEgGyxs" / X
“Innovation is key to the future – and early warning saves lives.” 🌍🔔 Our UN ambassador @NorwayAmbUNOG visited @Romsenteret & Geological Survey of Norway`s booth at #GP2025 to learn about Norwegian innovations that can support global efforts in early warning and early action https://t.co/JaFdEgGyxs
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John Dehls @john.dehls.net · 22/09/2025
I’d like to call your attention to a Special Session Drew Rotheram-Clarke (GSC) and I are co-chairing at #ISPRS2026 Toronto: 👉 “Cooperation on Ground Motion Monitoring for Disaster Risk Reduction and Resilience.” 👉 www.isprs2026toronto.com/special-sess... #DRR #InSAR
isprs2026toronto.com
ISPRS 2026 Special Sessions
Discover ISPRS 2026 Special Sessions – expert-led, in-depth discussions on emerging topics in photogrammetry, remote sensing, and spatial information sciences.
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John Dehls @john.dehls.net · 30/07/2025
I guess I will be holding my breath until about 14:29 CET today. #NISAR #InSAR
NISAR launch schedule, Launch at 14:10 CET, separation at 14:28.
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John Dehls @john.dehls.net · 28/04/2025
CLICKBAIT VOICE We processed radar images... You won't believe how much the ground moved! HAIKU VOICE Silent satellites. Unwrapped phase reveals secrets. The land shifts unseen. CONSPIRACY VOICE Supposed "scientists" claim ground deformation, based on "interferograms" from secret radar images.
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Bernhard Steinberger @bstein.bsky.social · 18/03/2025
More than 10,000 scientists living, working or educated in Germany have already signed this appeal by @de.scientists4future.org to the members of the newly elected parliament to step up efforts for climate protection. Click here www.bayceer.uni-bayreuth.de/s4f/de/top/o... if you'd like to join.
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John Dehls @john.dehls.net · 11/03/2025
Finally a predicted launch date for #NISAR (May 20). It will be a relief to see this happen, given the current political and financial chaos. I just hope the ground segment funding remains in place. www.spacelaunchschedule.com/launch/gslv-...
spacelaunchschedule.com
PSLV NISAR (NASA-ISRO Synthetic Aperture Radar) GSLV Mk II Rocket Launch
The NASA-ISRO Synthetic Aperture Radar, or NISAR satellite, will use advanced radar imaging to map the elevation of Earth's land and ice masses 4 to 6 times a month at resolutions of 5 to 10 meters. I...
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John Dehls @john.dehls.net · 15/02/2025
I hope not! Let's stick to the Sun-synchronous, near-polar orbit plan 😅
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John Dehls @john.dehls.net · 10/12/2024
Breathing a sigh of relief just now. www.esa.int/Applications...
esa.int
Sentinel-1C captures first radar images
Less than a week after its launch, the Copernicus Sentinel-1C satellite has delivered its first radar images of Earth – offering a glimpse into its capabilities for environmental monitoring. These ini...
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