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Simon Gascoin Profile
Simon Gascoin

@sgascoin

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Chercheur @CNRS @CesbioLab @ObsMip 💧 ❄️ 🛰️

Toulouse
Joined July 2009
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@sgascoin
Simon Gascoin
3 months
What is the effect of climate warming in a snow-dominated catchment?
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@sgascoin
Simon Gascoin
1 year
lidar is magic .. here is reveals some old paths hidden in a forest (Jura, France)
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@sgascoin
Simon Gascoin
2 years
La Corse qui surnage dans sa mer de nuage le 31 décembre 2021
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@sgascoin
Simon Gascoin
5 months
All named Antarctic icebergs until 2023 in a single clip! Data from @usnatice . Source file and code:
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@sgascoin
Simon Gascoin
5 years
Cross-sections of Greenland and Antarctica – both drawn to the same scale. Source:
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Simon Gascoin
3 years
[THREAD] Ce matin j'étais dans la classe de CM2 de mon fiston pour parler des glaciers avec les enfants...
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Simon Gascoin
5 months
Je suis très fier d'avoir participé à la traduction en français du magnifique diagramme du cycle de l'eau par @USGS Cette nouvelle version met en relief l'influence humaine et le rôle des aquifères en accord avec l'évolution de l'état de l'art en hydrologie.
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Simon Gascoin
1 year
A la demande populaire, voici une app pour visualiser le jeu de données RGE ALTI de l'IGN et comparer avec le fond de carte "satellite" de google :
@sgascoin
Simon Gascoin
1 year
lidar is magic .. here is reveals some old paths hidden in a forest (Jura, France)
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@sgascoin
Simon Gascoin
5 years
Khumbu icefall in 4D! Made with 109 #Ven µs images at 5 m resolution @CNES Higher resolution video and code snippet:
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Simon Gascoin
3 years
Hydrology papers
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@sgascoin
Simon Gascoin
7 months
il y a un an nous sommes devenus une famille sans voiture. Petit bilan financier.
@sgascoin
Simon Gascoin
2 years
Ça y est notre voiture part à la casse, nous sommes officiellement une famille sans voiture et décidée à le rester ! En tous cas on va essayer. On compte sur vous @LaSNCF #citiz @tisseo_officiel @Toulouse etc…
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Simon Gascoin
2 years
Le diagramme du cycle de l’eau version 2022 pour remplacer celui de vos manuels d’école. Superbe infographie de l’USGS
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Simon Gascoin
1 year
c'est fou la surface en eau du barrage Al Massira en avril n'a fait que décroitre depuis 2016 (deuxième plus grand réservoir artificiel du Maroc)
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Simon Gascoin
5 months
Hier soir il nous est arrivé une histoire incroyable avec ChatGPT ! il faut que tout le monde sache 👇
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@sgascoin
Simon Gascoin
3 years
Seigneur Vignemale ce matin
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@sgascoin
Simon Gascoin
1 year
#B22A is the largest iceberg in the Amundsen Sea, Antarctica (50 times Manhattan land area). It broke off from @ThwaitesGlacier 's tongue and remained grounded for 20 years.. But now it's on the go (1/4).
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Simon Gascoin
1 year
Afficher le relief et les orthophotos de l' @IGNFrance dans #earthengine ou @qgis sans rien télécharger c'est possible et c'est trop cool : #opendata #geocommuns
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@sgascoin
Simon Gascoin
3 years
Rivers are moving.. This is the Yellow River (Huang He) near Zhengzhou, China - captured by #Sentinel1 @ESA_EO @CopernicusEU
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Simon Gascoin
3 years
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Simon Gascoin
6 years
Satellite time lapse showing the filling of Xe-Pian Xe-Namnoy #Laosdam until July 17 (6 days before the collapse). Made from @CopernicusEU Sentinel-1 data in the @sentinel_hub #igarss2018
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@sgascoin
Simon Gascoin
4 years
Evolution du Banc d'Arguin en face de la dune du Pilat depuis 1984 @laduneduPilat @Depechedubassin @EspritBassin Série d'images des satellites Landsat
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@sgascoin
Simon Gascoin
4 years
Panache de sédiments dans la Méditerranée à l'exutoire du Var en crue #AlpesMaritimes Image prise aujourd'hui par le satellite #Sentinel2 @CopernicusEU
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Simon Gascoin
7 months
Le lidar de l'IGN révèle les cratère d'obus sous la forêt près de Vimy
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@sgascoin
Simon Gascoin
1 year
A la demande populaire, voici une app pour visualiser le jeu de données RGE ALTI de l'IGN et comparer avec le fond de carte "satellite" de google :
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@sgascoin
Simon Gascoin
3 years
Muldrow Glacier surge in Alaska: acceleration and increase of surface roughness captured by #Sentinel1 @CopernicusLand
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@sgascoin
Simon Gascoin
1 year
I'm not a SAR expert but I could perform my own analysis of the Joshimath landslide thanks to @Ak_Satellite on demand #Sentinel1 InSAR processing and #MintPy software. Explanations here: @davepetley @yunjun_z 🙏
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Simon Gascoin
3 years
Matheo : ce n'est pas à cause de toi que les glaciers disparaissent. C'est à cause de moi qui ai pris l'avion pour une semaine de conférence en Australie. C'est à cause des publicités pour les SUV. C'est à cause de décennies de surconsommation de viande et de gadgets..
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Simon Gascoin
3 years
There's currently a lot of blue ice and melt water ponds on the SW #Greenland ice sheet. These bright snow and ice patterns look beautiful in satellite images but they tell the same story as the dark areas scorched by giant wildfires in California or Siberia. #ClimateActionNow
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Simon Gascoin
3 years
Orange snow today in the Pyrenees! #dust #Sahara (source #Sentinel2 06 Feb 2021 @CopernicusLand )
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@sgascoin
Simon Gascoin
1 year
The Resurrection of Tulare Lake in California captured by #Sentinel2 @CopernicusEU
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@sgascoin
Simon Gascoin
3 years
Fraser river sediment plume in Georgia Strait #Vancouver on 16 nov 2021 captured by #Sentinel2
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Simon Gascoin
3 years
One year time lapse of surging Muldrow glacier in Alaska (update of the #Sentinel1 time series ) @CopernicusEU @DenaliNPS More here:
@sgascoin
Simon Gascoin
3 years
Muldrow Glacier surge in Alaska: acceleration and increase of surface roughness captured by #Sentinel1 @CopernicusLand
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Simon Gascoin
3 years
Snow probability by european country #dataviz #Sentinel2 (4 hydrological years from Sep 2020 to Aug 2020)
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@sgascoin
Simon Gascoin
3 years
The wall.. Impressive post-event image by @cnes @AirbusSpace Pléiades #Chamoli
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@sgascoin
Simon Gascoin
6 years
Evolution of the Normalized Difference Vegetation Index in Africa since 2016-July-30 from #MODIS @NASAEarth
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@sgascoin
Simon Gascoin
3 years
Airbus has released first images captured by #PleiadesNeo 😮 Yes it's a satellite picture, taken 620 km above the surface
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Simon Gascoin
2 years
A leak in #NordStream2 is visible in #Sentinel1 SAR image captured today 29 Sep. @CopernicusEU
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@sgascoin
Simon Gascoin
2 years
ça devait finir par arriver.. La surface enneigée des Pyrénées est la plus faible observée depuis 2001 un 6 février !
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Simon Gascoin
3 years
Elevation difference map & Pléiades digital surface model. Computed from #Worldview @Maxar by D. Shean @uwTACOlab and @EtienneBerthie2 #Chamoli
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Simon Gascoin
2 years
Doomsday approaching! Breakup of the @ThwaitesGlacier eastern ice shelf. Time lapse of 221 #Sentinel1 radar images @CopernicusEU
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@sgascoin
Simon Gascoin
5 years
1 year of Ouarzazate solar power station (only Sentinel-2B to reduce misregistration issues cf. )
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Simon Gascoin
3 years
[fin du thread]
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@sgascoin
Simon Gascoin
4 months
La surface enneigée mesurée par satellite dans les Pyrénées au début février est actuellement la plus faible depuis 24 ans ❄️🏔️ 🛰️ app : méthode :
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@sgascoin
Simon Gascoin
2 years
Field work today!
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@sgascoin
Simon Gascoin
5 years
[1/n] The refilling of Puclaro dam in the Elqui Valley (Chile) after the strong El Niño in winter 2015 #Sentinel2 @CopernicusLand
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@sgascoin
Simon Gascoin
2 years
Apparition d'un polynya dans la banquise devant le glacier Thwaites
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@sgascoin
Simon Gascoin
3 years
🚨 Si vous allez en montagne ce weekend : aidez-nous à mesurer la neige orange ! ❄️❄️ Les données seront utilisées par les scientifiques @CNRS_Toulouse @meteofrance @ObsMip @OSUG_fr @IGE_Grenoble @CesbioLab Merci de retweeter Plus d'infos :
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@sgascoin
Simon Gascoin
2 years
Before/after the dust .. Satellite images captured near Gavarnie, Pyrenees (01 Mar vs 19 Mar) by #Sentinel2
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@sgascoin
Simon Gascoin
3 years
La baie du #MontSaintMichel dans un écrin de neige le 10 février 2021 (image du satellite européen #Sentinel2 )
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@sgascoin
Simon Gascoin
1 year
Mi février la surface enneigée du bassin versant du Rhône est passée sous le minimum absolu précédent qui datait de .. l'an dernier #secheresse2023
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@sgascoin
Simon Gascoin
4 years
Fluvial processes in action! Estuaire de la Sée et de la Sélune, Baie du Mont-Saint-Michel #Sentinel2 @CopernicusLand
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@sgascoin
Simon Gascoin
2 years
New satellite image shows the extent of the food in Pakistan. It seems that many levees, roads, canals were overflown. Imagery #Sentinel2 @CopernicusEU
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@sgascoin
Simon Gascoin
4 years
❄️❄️Pour améliorer un algorithme de détection de la neige par satellite nous cherchons des volontaires pour mesurer l'enneigement ! ❄️❄️ Il suffit d'avoir un smartphone Android ==> Merci de diffuser au maximum !
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Simon Gascoin
6 months
Les données lidar de @IGNFrance commencent à être disponibles pour une bonne partie du territoire français. Un tournant pour de nombreuses applications ! Un exemple dans les Pyrénées.. #opendata #gischat
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@sgascoin
Simon Gascoin
6 years
Rivers of France #GIS
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@sgascoin
Simon Gascoin
5 years
Two billion pixels to check your next ski destination! Snow persistence maps from #Landsat and #Sentinel2 over the Alps and Pyrenees:
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@sgascoin
Simon Gascoin
6 years
@sentinel_hub @USGSLandsat @CopernicusEU @ESA_EO Now that's too easy to make a gif Ouarzazate #Solar power station
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@sgascoin
Simon Gascoin
1 year
some of them are visible in old aerial orthoimages (source IGN 1952)
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@sgascoin
Simon Gascoin
2 years
On March 2nd, the snow cover area in the Alps has reached its lowest value since 2001. Only 43% of the alpine range was covered by snow, whereas the average is 63% on the same day over the period 2001-2021.
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@sgascoin
Simon Gascoin
4 years
Lake #Poyang shrinks dramatically during the dry season, forcing the ships to follow a narrow lane in the channel that connects Poyang Lake to the Yangtze river (Bright spots are ships in this time lapse of #Sentinel1 SAR images, 1 image every 6th day from July 2019 to July 2020)
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@sgascoin
Simon Gascoin
11 months
Almost two weeks after the destruction of the dam this is how Lake Kakhovka looks... (June 18)
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@sgascoin
Simon Gascoin
4 years
Le glacier d’Ossoue ce matin.. toujours un beau panorama quelque soit la saison. Beaucoup de monde sur les pentes du Vignemale : attention aux chutes de pierre ! @Meteo_Pyrenees
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@sgascoin
Simon Gascoin
3 years
False color satellite image reveals the strong vegetation contrast between the humid southern slope of the eastern Himalayas and the dry Tibetan plateau (captured by #Sentinel2 on March 25)
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@sgascoin
Simon Gascoin
5 years
1/n inspired by a tweet by @HadiHJaafar I started looking at maritime traffic from @CopernicusEU #Sentinel1 in the English channel
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@sgascoin
Simon Gascoin
6 years
The fault line running through #Palu captured by #Sentinel2 @ESA_EO @CopernicusEU
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@sgascoin
Simon Gascoin
2 years
From 22 years of MODIS satellite daily data, I compute that the snow probability over the #Trojena mountains does not exceed 1.7 days per year. Yes, less than 2 days of snow every year in average. Source code #EarthEngine :
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@NEOMTROJENA
TROJENA
2 years
It’s official… #TROJENA will host the 9th #AsianWinterGames in 2029. From our world-class, cutting-edge mountain destination, we plan to put on the competition’s best event yet. Will you be attending? #TROJENA2029 #NEOM
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@sgascoin
Simon Gascoin
6 months
Depuis plusieurs jours, le Rhône en crue crache des sédiments dans la Méditerranée (image satellite Sentinel-2 prise ce matin, embouchure du Grand-Rhône).
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@sgascoin
Simon Gascoin
4 years
October Revolution Island on 15 Aug 2020 (near infrared composite). This summer heatwave in the Russian Arctic has stripped the snow from the ice caps revealing old ice layers. #Sentinel2 @CopernicusLand
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@sgascoin
Simon Gascoin
10 months
Puisque tout le monde parle de la température de surface mesurée par satellite en Espagne y compris sur BFMTV (!) voici une petite analyse pour avoir des ordres de grandeur en tête.
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@sgascoin
Simon Gascoin
3 years
La vraie question c'est : pourquoi ce point d'interrogation ?
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@ladepechedumidi
La Dépêche du Midi
3 years
⛰️ Réchauffement climatique : que restera t-il de glaciers pyrénéens dans 30 ans ? #occitanie
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Simon Gascoin
5 years
3D view of Shisper Glacier surge in Pakistan. The recent ice-dammed lake poses a threat of outburst flood. #Sentinel2 images @CopernicusEU
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@sgascoin
Simon Gascoin
7 years
Preparing my slides for #PYRADAPT @opcc_ctp Evolution of the snow cover area in the Pyrenees from MODIS
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@sgascoin
Simon Gascoin
2 years
Before/after the dust (2) A slight color change.. but likely enough to cause earlier snow melt and impact glacier mass balance (here Aletsch glacier, Switzerland) 10 Mar vs 20 Mar 2022 #Sentinel2 @CopernicusEU @VAW_glaciology
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@sgascoin
Simon Gascoin
5 years
Sentinel-2 + OpenStreetMap = ♡ Read the love story that is happening in Brazil..
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@sgascoin
Simon Gascoin
6 years
Plastic greenhouses near Almeria, Spain (sequence of 55 Sentinel-2 clear-sky images all acquired in 2018) @CopernicusEU
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@sgascoin
Simon Gascoin
4 years
Global NO2 monitor: an app to visualize changes in airborne NO2 due to #coronavirus in near real time ==> [Made with #EarthEngine using #Sentinel5p @CopernicusEU satellite data]
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@sgascoin
Simon Gascoin
6 years
Clouds are not allowed to cross the border in Lesotho #Sentinel2 on 03 Aug 2018 via @sentinel_hub @CopernicusEU
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@sgascoin
Simon Gascoin
7 years
I think I spotted the hottest place in Antarctica. Thanks to @Jamie_Woodward_ more info here @CopernicusEU
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@sgascoin
Simon Gascoin
6 years
#LarsenC The Movie 📽️ updated Time lapse of 56 #Sentinel1 extra wide swath images since 2016-10-01. Iceberg #A68 is leaving my bounding box!
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@sgascoin
Simon Gascoin
4 years
What are these triangle clouds in the Gulf of Oman!? It looks like contrails but why this trajectory? #Geomystery Image captured on 2020-Jan-09 by #Sentinel2 @CopernicusEU @HarelDan
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@sgascoin
Simon Gascoin
7 years
Can't stop looking at #Antarctica in #Sentinel2 imagery! Here Thwaites glacier shelf on Feb 02 .. AKA the turtle shelf? #Sentinel2Go
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@sgascoin
Simon Gascoin
7 years
#LarsenC : The Movie 🎥 Made with 1 year of extra-wide swath single HH Sentinel-1 data available @sentinel_hub @ESA_EO @CopernicusEU
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@sgascoin
Simon Gascoin
1 year
Wild et al. "Removal of this iceberg and subsequent loss of landfast sea ice is not only likely to modify regional ocean circulation, but an open-water regime might also allow the seasonal inflow of solar-heated surface water that increases basal melting"
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@sgascoin
Simon Gascoin
1 year
La sécheresse continue dans les Pyrénées Orientales. La surface enneigée du parc des Pyrénées Catalanes est proche du minimum observé par satellite depuis 2000. J'ai rencontré aujourd'hui des acteurs de la gestion de l'eau sur ce territoire qui sont très préoccupés !
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@sgascoin
Simon Gascoin
6 months
The snow cover area is currently well above the 30 year normal in the Alps (source )
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@sgascoin
Simon Gascoin
4 months
On Feb 3rd the Alps snow cover area fell well below the minimum. The snow may be back soon but this snow-free period in winter is hardly insignificant for alpine ecosystems.
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@subfossilguy
Melaine Le Roy
4 months
Besides Pyrenees, snow cover is at an all-time low in the the Alps too, close to an absolute minimum compared with a 30-year climatology (1991-2021) based on the work of @sgascoin ❄️🌡️😱 App : Method:
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Simon Gascoin
6 years
Pioneer Glacier on Pioneer Island, Russian Arctic (79.9°N). The image was captured by #Sentinel2 on 11 Aug 2018. The snow line moved up during the summer melt season revealing the clean blue ice below the firn.
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@sgascoin
Simon Gascoin
4 months
Font-Romeu "un domaine skiable des plus modernes et des plus séduisants du massif"
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@sgascoin
Simon Gascoin
4 years
Hítardalur landslide in western Iceland "among the largest landslides in historical time in Iceland" (debris cover 1.5 sq km, 20 to 30 m thick) #Sentinel2 @CopernicusLand @davepetley
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@sgascoin
Simon Gascoin
3 years
The flow and calving of Français and Astrolabe glaciers ( #Antarctica ) from two synchronized sequences of #Sentinel1 #SAR images
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@sgascoin
Simon Gascoin
2 years
Large sediment plume in the Atlantic Ocean near Rio Doce outlet after heavy rains in Brazil @CopernicusEU #Sentinel2
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Simon Gascoin
5 years
The shrinkage of Lake Puzhal in Chennai, India, which supplies water to about 4.6 million people according to @SominiSengupta @nytimes
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Simon Gascoin
5 months
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Simon Gascoin
5 years
See how Gansu Dunhuang #Solar Park pops out in less than a year! 75 #Sentinel2 images from @sentinel_hub @CopernicusEU
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@sgascoin
Simon Gascoin
10 months
Measuring snow depth from space is difficult.. We just published a new promising approach using the lasers of @NASA_ICESat2 ! Study led by @csar_db @CesbioLab in collaboration with @uwTACOlab @IPE_CSIC #pewpew
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Simon Gascoin
5 years
This morning at #AGU18 I will release our latest product: annual snow cover persistence maps at 20 m for the Alps and the Pyrenees!
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@sgascoin
Simon Gascoin
3 years
What happens to streamflow when a plain becomes a mountain? As elevation increases, precipitation increases, but temperature decreases. The result is the formation of a seasonal snowpack and a drastic change in the stream hydrograph.
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@sgascoin
Simon Gascoin
6 years
Hey @Antartica_ET this is a clear-sky satellite image of Deception Island on 2018-Sep-16 ... May be helpful to prepare the campaign: Whalers bay is already ice free! @CopernicusEU #Sentinel2
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Simon Gascoin
6 years
New animation of Vavilov ice cap collapse, this time using #Sentinel1 @CopernicusEU radar (no issue with clouds or polar night) "You can literally watch an ice cap gut itself in front of your eyes" quote by @IceSheetMike , 2018 @inrushmd
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Simon Gascoin
5 years
🇬🇧Observed annual temperatures at the mountaintop of the Pic du Midi de Bigorre, in the French Pyrénées (2875m) since 1881 #ShowYourStripes 🇫🇷Evolution des températures annuelles mesurées au Pic du Midi (2875m) depuis 1881 Data source: @meteofrance et merci @jms_nd !
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