Markus Weingärtner @markusblogde

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**Greg Cocks** @GregCocks@techhub.social · 28. Apr.

**Greg Cocks** @GregCocks@techhub.social · 30. März

Greg Cocks @GregCocks@techhub.social

The Harmonized Landsat Sentinel-2 Project Releases Vegetation Indices
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https://www.earthdata.nasa.gov/news/harmonized-landsat-sentinel-2-project-releases-vegetation-indices <-- shared technical article
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https://hls.gsfc.nasa.gov/ <-- shared NASA Harmonized Landsat Sentinel-2 Project page
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https://youtu.be/63ljR84c85M?si=3Q0PDOuFgKG8nIrA <-- shared NASA overview video
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#GIS #spatial #mapping #fedscience #OPERA #remotesensing #earthobservation #satellite #opendata #global #vegetation #indices #HLS #Landsat #Sentinel #HLSL30VI #HLSSS30VI #greenness #moisturecontent #burned #change #OLI #MultiSpectral #NDVI
@nasa | @ESA

**Greg Cocks** @GregCocks@techhub.social · 19. März

19. März

Greg Cocks @GregCocks@techhub.social

A Google-Backed… [Satellite] To [Help] Battle Wildfires Made It Into Orbit
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https://techcrunch.com/2025/03/17/a-google-backed-weapon-to-battle-wildfires-made-it-into-orbit/ <-- shared technical article
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https://sites.research.google/gr/wildfires/firesat/ <-- shared Google FireSat home page
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https://youtu.be/pmQlXLaHT_Y?si=q3wM80t7qQysAQxU <-- shared video overview of FireSat
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https://www.earthfirealliance.org/ <-- shared Earth Fire Alliance home page
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[this post should not be considered an endorsement of this product]
#GIS #spatial #mapping #FireSat #monitoring #fire #wildfire #EarthFireAlliance #Google #satellite #remotesensing #earthobservation #detection #tracking #earlywarning #multispectral #infrared #spatialanalysis #spatiotemporal #risk #hazard #climatechange #extremeweather #impacts #humanimpacts #infrastructure #damage #AI #machinelearning #emergencyresponse #model #modeling
@Google @GoogleResearch @EarthFireAlliance @MuonSpace

**Greg Cocks** @GregCocks@techhub.social · 26. Feb. *

26. Feb. *

Greg Cocks @GregCocks@techhub.social

Multispectral Remote Sensing Expression of Lineaments and Alteration Minerals in Part of Crystalline Rock Units of Southwestern Nigeria - Implication on Gold Prospecting
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https://doi.org/10.1016/j.oreoa.2025.100091 <-- shared paper
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#GIS #spatial #mapping #ASTER #Gold #Hydrothermal #HydrothermalAlteration #Lineament #Landsat #ETM #EnhancedThematicMapper #phyllic #Ilesha #schist #belt #geology #mining #Nigeria #naturalresources #mineral #mineralresources #golddeposits #aerogeophysical #remotesensing #geophysical #spatialanalysis #geomorphology #geomorphometry #alteration #propylitic #argillic #mineralogy #XRD #structuralgeology #lithology #PrincipalComponentAnalysis #PCA #prospecting #fracture #joints #faulting #Multispectral #Lineaments #Crystalline

aerial oblique image - existing gold mine, Nigeria

geology/geomorphology map - Showing VES Positions Overlay on Mineral Prospective Map

(a) Lineament Map of the Study Area (b) Lineament Density Map of the Study Area (c) Superposition of Lineament on Geology Map of the Study Area

maps of remote sensing data - (a) Composite (RGB) 7, 5, 2 Image of the Study Area (b) Composite (RGB) 3, 2, 1 Image of the Study Area (c) Composite (RGB) 4, 3, 1 Image of the Study Area (d) Composite (RGB) 3, 2, 1 Image of the Study Area

**Anna Dorofeeva** @litteracarolina@mastodon.online · 14. Feb.

14. Feb.

Anna Dorofeeva @litteracarolina@mastodon.online

Revealing #palimpest with #multispectral #imaging! These amazing results, showing a #Merovingian overtext and a 5th-century Gospel undertext, were achieved by my colleague Alex Zawacki at Göttingen. I'll be presenting the full results of this and other cool discoveries in May at a German-language conference in Kiel.

#palaeography @medievodons @histodons

Part of a medieval manuscript, set on its side, with the two lines of the overtext in 2 vertical lines on the left, and 6 lines of faintly brown undertext running horizontally across the image.

**Erik** @pleiotrope@fosstodon.org · 9. Feb.

9. Feb.

Erik @pleiotrope@fosstodon.org

A false-color #multispectral photo I took of a larkspur with UV and IR light mapped on top of a regular visible-color photo. Inner parts of the flower petals reflect more UV than others and thus show up in blue. Other parts absorb UV but reflect IR, resulting in the red colors seen in the inner part of the flower and stems. Many flowers use this contrast to help pollinators (who often can see UV) to distinguish key parts of the flower.

A close-up of a flower with droplets of water on its petals. The flower exhibits shades of blue, purple and pink, set against a dark background.

#photography #uvphotography #infraredphotography

**Greg Cocks** @GregCocks@techhub.social · 5. Feb.

5. Feb.

Greg Cocks @GregCocks@techhub.social

Evidenced Paleodrainages In Desert Regions Of Saudi Arabia - Satellite Images With Field-Based Study
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https://doi.org/10.21203/rs.3.rs-4959129/v1 <-- shared paper
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#GIS #spatial #mapping #water #hydrology #streams #poroussediments #pebbles #RadarImages #SaudiArabia #MiddleEast #remotesensing #drainage #paleodrainage #desert #evidence #satellite #imagery #fieldwork #fieldchecked #Quaternary #Pleistocene #climatechange #geology #landform #geomorphology #arid #streamnetwork #PALSAR #ASTER #thermaldifferentiation #spatialanalysis #multispectral #sediment #lithology #hydromorphic #geomorphmetry #waterresources #usecase

maps and photo - Abrupt cut of drainages when reaching loose materials (e.g., sands) as revealed on a geologic map; the same location in the map is shown in the attached photo

annotated image maps - The images above show the current drainages existed on SRTM DEM; while the image below is a processed ALOS PALSAR image showing traces of delta-like shape paleodrainages (DPl); but they do not coincide with the current drainages in the SRTM DEM (image above). Triangle at point S1 is the site where the stratigraphic sequence was investigated.

photo - sand meets the rock outcrops, Hafar Al Batin desert

annotated image maps - he image above shows a shaded figure for an odd paleodrainage (OPl) as shown on the processed ASTER image. The same ASTER image was used below after projecting the current drainages extracted from STRM DEM. There is no coincidence between the OPl and the current drainages evidencing an invisible paleodrainage (OPl). Triangle at point S2 is the site where the stratigraphic sequence was investigated

**Erik** @pleiotrope@fosstodon.org · 23. Jan. *

23. Jan. *

Erik @pleiotrope@fosstodon.org

My first image from my hacked-together #multispectral (IR, UV, and visible light) camera. Near IR is in red, visible light is in green, and UV is in blue.

The camera itself is a monochrome camera I normally use for solar imaging, while the lens is just a regular Nikon 50 f/1.8D. Between the two is an electronic filter wheel with IR pass, IR cut, and UV pass filters.

A landscape with a greenish-blue sky and distant hills with houses on them. In the foreground are more houses and palm trees. The vegetation varies between orange and red instead green.

#uvphotography #irphotography #photography

**Daniel Fischer** @cosmos4u@scicomm.xyz · 14. Nov. 2024

14. Nov. 2024

Daniel Fischer @cosmos4u@scicomm.xyz

Automatic detection of methane emissions in #multispectral satellite imagery using a vision transformer: https://www.nature.com/articles/s41467-024-47754-y -> New AI Model Detects Methane Emissions From Space More Accurately: https://www.asianscientist.com/2024/09/environment/new-ai-model-detects-methane-emissions-from-space-more-accurately/ - this will help in tracking and reducing methane emissions to fight climate change.

NatureAutomatic detection of methane emissions in multispectral satellite imagery using a vision transformer - Nature CommunicationsAccurate monitoring of methane emissions is essential to understand its contribution to global warming. The authors here employ multi-spectral satellite data to create a methane detection tool with global coverage and high temporal and spatial resolution.

Antwortete Anna Dorofeeva

**Andreas Janke** @andreasjanke@openbiblio.social · 3. März 2024

3. März 2024

Andreas Janke @andreasjanke@openbiblio.social

@litteracarolina @medievodons @histodons @historikerinnen It's great that you also teach the processing of #multispectral data. Hoku is really an important tool for the future of visualising lost writing and other features.

**Anna Dorofeeva** @litteracarolina@mastodon.online · 3. März 2024

3. März 2024

Anna Dorofeeva @litteracarolina@mastodon.online

Today my students and I are on our way to beautiful #Vercelli and #Verona for our annual week-long spring school! We’re working with some amazing #medieval #manuscripts there (including the Vercelli Book!), but also with modern technologies like #multispectral imaging and endoscopy. I’ll try to post images of some of our activities using #Vercelli2024. But first - 11 hours on the train…

@medievodons @histodons @historikerinnen