#earthobservation — Public Fediverse posts

https://www.europesays.com/dk/180858/ Limfjord cuts across northern Denmark | EU Space Support Office #Danmark #Denmark #EarthObservation

🔥 Did Calgary Get Hotter in the Summer of 2026? A Satellite View of Our City
🛰️ Following pre-processing of satellite time series, I evaluated the Land Surface Temperature (LST) across a random spatial sample of 15,000 valid pixels within city boundaries for the summers of 2025 and 2026.
What the Distribution Statistics Reveal:
🔹 Median Shift: During clear-sky midday hours, Calgary's median land surface temperature rose from 33.5 °C in 2025 to 36.5 °C in 2026. A 3.0°C shift in baseline indicates a substantial intensification of the city's clear-sky thermal regime.
🔹 Shift in the Thermal Core (Mode): In 2025, the most prevalent surface temperature was approximately 35°C. In 2026, the modal peak expanded into the 37–39°C range.
🔹 Percentile Comparison: The 2025 median matched the lower quartile of 2026. This means that 75% of the city’s area in 2026 experienced higher surface temperatures than half of Calgary did a year earlier.
#GIS #RemoteSensing #EarthObservation #Calgary #LandCover #GreennessOfCalgary

Sentinel-2 quick reference: B4 red, B8 near-infrared, B11/B12 shortwave infrared for moisture and burns. Knowing the bands is knowing the instrument.
#Sentinel2 #RemoteSensing #Teaching #EarthObservation

Satellite view of Ohio — 2026-10-04
Imagery: MODIS_Terra_CorrectedReflectance_TrueColor
https://worldview.earthdata.nasa.gov/?v=-84.82,38.4,-80.52,42.32&l=MODIS_Terra_CorrectedReflectance_TrueColor&t=2026-10-04

Imagery: NASA GIBS #satellite #NASA #EarthObservation

🍁 Fall foliage at Nose Hill Park: nature’s annual stress-test for remote sensing ML models.

🍂 As chlorophyll degrades, the NIR reflectance drops sharply, completely reshaping the NDVI signature of aspen stands and native fescue grasslands. Supervised classifiers (like Random Forest) trained solely on peak-summer composites quickly stumble when seasonal phenology drifts, often misclassifying senescent canopy as sparse ground or bare soil.

🛰️ Nothing beats on-the-ground validation to remind you what actual spatial heterogeneity looks like inside a single 10m/30m pixel.

#EarthObservation #RemoteSensing #MachineLearning #GroundTruth #Calgary #NoseHillPark #GIS #DataScience #FOSSGIS #GreennessOfCalgary

ESA, CAS release first images from SMILE; officially begin science operations

https://fed.brid.gy/r/https://www.nasaspaceflight.com/2026/10/smile-uvi-sxi-commissioning/