#ndvi — Public Fediverse posts

The Earth breathes. 🌍🌿 Forests green and fade, croplands pulse with the seasons, and from orbit, satellites track that rhythm. Vegetation indices like NDVI turn sunlight into a heartbeat we can map. The living planet, seen from above. 🛰️

#RemoteSensing #NDVI #Vegetation #Geography #Satellites #EarthObservation

[Перевод] Как найти остров по одной фотографии: геолокация через геометрию и CUDA

Фото островного курорта. Ни EXIF, ни GPS, ни модели камеры – ничего. Нужно назвать курорт, координаты и сторону света, куда смотрела камера. Пытаться ответить на эти вопросы через google lens – значит упустить возможность повеселиться. Поэтому я взялся за задачу с помощью математики и программирования.

https://habr.com/ru/companies/cloud4y/articles/1072778/

#OSINT #геолокация #CUDA #GPU #Python #геометрия #OpenStreetMap #спутниковые_снимки #NDVI #Sentinel2

NDVI = (NIR − Red) / (NIR + Red). Healthy leaves reflect near-infrared hard and drink red light, so the ratio climbs. One line of math, a planet's worth of vegetation.
#RemoteSensing #NDVI #Teaching #Sentinel2

Identifying Agricultural Consumptive-Use Patterns To Support Adaptive Water Management In California’s Santa Clara Valley Via Remote Sensing And Machine Learning
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https://doi.org/10.1371/journal.pwat.0000416 <-- shared paper
--
H/T @Guillaume Wright | Executive Editor, PLOS
“💧 With drought [and high temperatures] gripping many areas of the world right now... [the H/T] wanted to highlight a new paper in PLOS Water this week with a very timely focus on hydroclimatic stresses and what can be done to mitigate this through water management practices when it comes to agriculture.
[The authors] investigate[d] adaptive water management practices in California’s Santa Clara Valley via remote sensing and machine learning techniques. They [found] good evidence for use of customized agricultural water-management plans for irrigation monitoring, conservation planning, and adaptive water management in groundwater-dependent regions such as is found in California…”
#GIS #spatial #mapping #California #SantaClara #SantaClaraValley #custom #watermanagement #practices #waterresources #agriculture #remotesensing #spatialanalysis #machinelearning #earthobservation #AI #planning #wateruse #efficiency #water #hydrology #irrigation #conservation #adaptivewatermanagement #model #modeling #drought #extremeweather #hydroclimate #stress #crop #cropland #evapotranspiration #ET #NDVI #PRISM #precipitation #rainfall #watermanagementplan #groundwater

🌱🛰️ Agroecology Map now has two new satellite layers for mapped locations: EVI and NDMI. These indicators help communities look at living landscapes from new angles, together with NDVI. They make it easier to follow vegetation, water stress, restoration, and seasonal change over time. 🗺️💚💧

Take a look
https://agroecologymap.org/location/the-food-farm/ndmi

https://agroecologymap.org/location/the-food-farm/evi

#Agroecology #AgroecologyMap #Agroforestry #EVI #NDMI #NDVI #GIS

Scientists See More Vegetation In The Himalayas - But It Is Not Good News, Because That Extra “Green” Can Disrupt Water, Snow, And High-Mountain Biodiversity | Plants Growing Higher Across Himalaya As Climate Warms
(Vegetation On The Move: Elevational Shifts And Greening Dynamics Across The Himalayan Alpine Zone)
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https://www.ecoticias.com/en/scientists-see-more-vegetation-in-the-himalayas-but-it-is-not-good-news-because-that-extra-green-can-disrupt-water-snow-and-high-mountain-biodiversity/33120/ <-- shared technical article
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https://news.exeter.ac.uk/faculty-of-environment-science-and-economy/earth-and-environmental-science/plants-growing-higher-across-himalaya-as-climate-warms/ <-- shared technical newsitem
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https://doi.org/10.1002/ecog.08259 <-- shared (2026) paper
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https://doi.org/10.1111/gcb.14919 <-- shared (2020) paper
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“For years, the biggest climate warning from the Himalaya was easy to picture because glaciers were shrinking on the roof of Asia. Now, researchers are pointing to a quieter signal, one that can look almost harmless from a distance. The mountains are getting greener.
New research [link above] shows alpine vegetation moving higher across six Himalayan regions from 1999 to 2022, pushed in part by warming and reduced snow depth. That might sound like nature recovering, but in this fragile landscape, more plant cover at extreme heights may change how snow is stored, how water runs downhill, and how rivers behave for communities far below…”
#GIS #spatial #mapping #remotesensing #earthobservation #satellite #landsat #landcover #NDVI #Himalaya #Nepal #India #Bhutan #climatechange #glacier #vegetation #alpine #level #greening #spatialanalysis #spatiotemporal #snow #water #ice #hydrography #hydrology #ecosystems #humaninpacts #phenology #model #modeling #HighMountainAsia #greenness #ERA5 #vegetationline #altitude #climatictrends #warming #precipitation #rainfall

7/
5. The Paradox of Greening

Satellite tracking measures a massive increase in the Normalized Difference Vegetation Index (NDVI), meaning the Arctic is getting visibly greener. However, this greening is not an environmental victory. The incoming dark tree canopies and tall shrubs destroy the snow's high albedo effect; instead of reflecting sunlight back into space, they act as a dark thermal sponge.

https://youtu.be/loRR-H4lTC8

#Arctic
#ClimateChange
#GlobalWarming
#NDVI

Remote Sensing And GIS-Supported Framework Of Pre-Monsoon Drought Assessment In Bangladesh (2000–2022) Using CHIRPS-Based SPI-3 And MODIS-Derived Vegetation And Temperature Indices
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https://doi.org/10.1007/s12665-026-12848-x <-- shared paper
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H/T MD. ABDULLAH AL MAMUNM | Studying PhD in Rural and Environmental Sciences
“১ বছর ২০ দিন লেগে গেল! প্রথম ৪ জন রিভিউয়ারের প্রায় ৫০+ কমেন্টের পর মনে হয়েছিল আর এগোব না। তবে আমার সুপারভাইজার বলেছিলেন, “রিজেকশনের চেয়ে কমেন্ট ফেস করা ভালো।”
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#GIS #spatial #mapping #remotesensing #Bangladesh #earthobservation #water #hydrology #premoonsoon #moonsoon #drought #CHIRPS #MODIS #SPI #vegetation #temperature #indices #parameters #SPI #NDVI #VCI #TCI #VHI #monitoring #droughts #agriculture #farming #crop #cultivation #yield #foodsecurity #weather #rainfall #precipitation #Pearsoncorrelation #geostatistics #irrigation #watersecurity #foodsecurity #policy #planning

🏡 Here is the data analysis for Calgary, Summer 2025. This chart shows the relationship between vegetation density (NDVI) and Land Surface Temperature (LST).

🔥 The data reveals a critical "tipping point": vegetation only starts effectively cooling the environment once it reaches a specific density threshold. Below this threshold (the left side of the curve), green spaces stay just as hot as the surrounding concrete.
Sparse or isolated trees don't act as air conditioners—they "burn" in the urban furnace right along with us.

❗ What does this mean for Calgary? Simply planting a few scattered trees isn't enough. To actually move the needle on temperature, we need dense, healthy green belts. Otherwise, it’s just a waste of water and resources.

🔗 Link to the research: https://www.datastory.org.ua/calgarys-summer-heat-a-2025-satellite-perspective/

#Calgary #UrbanHeatIsland #NDVI #ClimateChange #UrbanPlanning #DataScience #Environment #YYC #BigData #ScienceMatters #GreennessOfCalgary #ClimateOfCalgary #rstats #RemoteSensing #OpenScience

How hot was Calgary's neighborhood in 2025? 🛰️🌡️

I processed satellite data from last summer to see how Calgary’s communities handle the heat. It turns out that not all greenery is equal. My research shows a clear "breakpoint" where the density of vegetation actually starts to drop the surface temperature.

I’ve mapped the "Hottest" and "Coolest" communities — see where yours stands and why some "green" areas are still overheating.

Full article and maps here:
https://www.datastory.org.ua/calgarys-summer-heat-a-2025-satellite-perspective/

#RemoteSensing #Rstats #GreennesOfCalgary #ClimateOfCalgary #OpenData #FOSSGIS #ClimateResilence #Landsat #Sentinel2 #Calgary #Alberta #Canada #YYC #LST #NDVI

Predictability Of Earth’s Greenness [incl. spatial]
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https://doi.org/10.1016/j.isprsjprs.2026.02.038 <-- shared paper
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https://phys.org/news/2026-02-global-greening-earth-green-shifting.html <-- shared technical article
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https://www.vox.com/down-to-earth/2024/2/7/24057308/earth-global-greening-climate-change-carbon <-- shared technical media article
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https://doi.org/10.1038/s41893-019-0220-7 <-- shared (2019) paper
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#Earth #greenness #deeplearning #AI #usecase #productivity #vegetation #foliage #greening #forecasting #geomorphometry #vegetationindex #NDVI #GIS #spatial #mapping #earthobservation #remotesensing #spatialanalysis #spatiotemporal #satellite #global #landuse #landcover #management #biomass #agriculture #crops #environment #ecosystems #forestcover #sustainability #foodsecurity #soilmoisture #treecover #temperature #parameters #forest #forested #landmanagement #agronomic #irrigation #fertilisation #croprotation #pestcontrol #attentionmodel #metrics

Calgary experienced a very wet and rainy summer in 2025. Naturally, the city’s vegetation responded vigorously to the high moisture levels, showing lush growth compared to the scorching summer of 2024. 🌿
Among residential areas, tiny Roxboro showed the most significant "greening"! Meanwhile, the lowest "recovery" rates were observed in the city's newest communities.

Read more about my research and explore the full data here:
https://www.datastory.org.ua/how-much-greener-is-calgary-in-2025/

#Calgary #NDVI #RemoteSensing #DataScience #Climate #YYC #OpenData #RStats #GreennessOfCalgary

How did Calgary respond to the wet summer of 2025?
Here’s the median summer NDVI map derived from Sentinel-2 imagery.
You can clearly see the Bow River corridor, Nose Hill Park, and the contrast between established tree-rich communities and newer developments.

Full analysis here:
https://www.datastory.org.ua/how-much-greener-is-calgary-in-2025/

#Geospatial #NDVI #UrbanClimate #Calgary #RStats #GreennessOfCalgary #yyc #Apberta #QGIS #foss4g #EnvironmentalMonitoring #UrbanHealth

New analysis published:
“How Much Greener Is Calgary in 2025?”

Using Sentinel-2 data (~8.5M pixels), I calculated NDVI change (ΔNDVI) between the 2024 drought and the rainy 2025 season across all Calgary communities.

Clear spatial pattern:
• Strong rebound in mature tree neighborhoods
• Limited change in developing, impervious-heavy zones

Method: R (terra, tidyverse) + QGIS
Community boundaries: Open Calgary

Article + interactive table: https://www.datastory.org.ua/how-much-greener-is-calgary-in-2025/

#RemoteSensing #NDVI #OpenData #UrbanEcology #RStats #QGIS #GreennessOfCalgary

How much does landform position matter for vegetation dynamics across Calgary?

I explored how ΔNDVI (2025-2024) varies across geomorphon classes (summit, ridge, slope, hollow, valley, etc.) using a large spatial dataset (~194k observations).

A few key points from the analysis:
• Non-parametric Kruskal–Wallis test shows statistically significant differences between geomorphons
• However, the effect size is moderate (ε² ≈ 0.04)
• Distributions strongly overlap — landform position matters, but it is not a deterministic driver
• Median ΔNDVI tends to be higher in lower landscape positions (hollows, footslopes, valleys), consistent with moisture and accumulation controls

#EnvironmentalData #RemoteSensing #NDVI #LandscapeEcology #Geomorphology #DataAnalysis #RStats
#ReproducibleResearch #Calgary #GreennessOfCalgary #Sentinel2

Detecting Drought Stress In Trees From The Air [Switzerland]
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https://www.linkedin.com/pulse/detecting-drought-stress-trees-from-air-eidg-forschungsanstalt-wsl-mrjue <-- shared technical article
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https://doi.org/10.1016/j.agrformet.2025.110856 <-- shared paper
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https://www.inverse.com/science/trees-dying-shocking-rates-understanding-save-them <-- shared technical article
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#Umweltbeobachtung #Wald #Trockenheit #Drohnen #Forschung #EnvironmentalMonitoring #Forest #Trees #Drought #Drones #Research #UAV #GIS #spatial #mapping #remotesensing #tree #vegetation #climatechange #heatstress #hot #summer #sunlight #discolouration #leaf #leaves #defoliation #impacts #crowns #canopy #water #hydrology #drought #risk #hazard #drone #imagery #survey #nativetree #monitoring #spatialanalysis #spatiotemporal #measurement #methodology #drought #coping #Droughtstress #Forest #NDVI #PRI #Xanthophyll #Turgorlosspoint #waterstress #dehydration #mortality #death #dying #loss #hydraulicfailure #biology #botany #canopy

How successive #meteotsunami and storm activity disrupts #saltmarsh vegetation

Clare Lewis, Jonathan Dale, Jessica Neumann, Tim Smyth, Hannah Cloke, October 2025

Abstract
"Meteotsunami (#MeteorologicalTsunami) are globally occurring progressive shallow water waves with a period of between 2 and 120 min which result from sudden pressure changes and wind stress due to moving atmospheric systems. These waves are known to cause destruction to and loss of assets. Currently, there is no research into the impact of meteotsunami on #CoastalEcosystems such as saltmarshes, despite the significant role saltmarsh play in providing vital habitats for resident and migrating birds, natural flood defences and climate mitigation. As such the restoration of saltmarshes has emerged as a pivotal focus within the UK Government's environmental policy framework.

"This paper examines the impact of two meteotsunami events (2016 and 2021) on saltmarsh vegetation in the southwestern #UK. An assessment of the vegetation pre and post event was undertaken using high resolution satellite imagery and the Normalised Difference Vegetation Index (#NDVI). Results revealed that the 2016 meteotsunami exacted minimal vegetation change with a decrease in NDVI from 0.26 to 0.23 and a temporary reduction in coverage of 40%, suggesting a potential resilience to single episodic disturbances. In contrast, the 2021 event, compounded by multiple significant storms and additional meteotsunami, led to a decline in NDVI values from 0.44 to 0.22 and a temporary reduction in vegetation coverage of 66%.

"Both events indicated a short-term disruption with a relatively rapid rebound (within one to three months). However, the longer-term effects of such a disruption on the saltmarsh ecosystem need to be investigated further.
This comparative analysis underscores the complex interactions between meteotsunami, climatic phenomena, and coastal vegetation dynamics, highlighting the necessity for ongoing monitoring and research to understand the resilience mechanisms of such ecosystems in the face of increasing #ClimaticVariability and #ExtremeWeather events."

Full paper:
https://www.sciencedirect.com/science/article/pii/S0272771425003737

#ClimateChange #AtmosphericDisturbances #AtmosphericDisturbance #CoastalAreas #RogueWave

💡 We’re excited to share that our new satellite-based NDVI monitoring feature is now in early testing at selected locations. Using Sentinel-2 imagery processed through OpenEO, the system generates up to 36 months of historical NDVI data and true-color maps, enabling vegetation health monitoring, ecosystem restoration tracking 🌍✨

📍 Testing locations:

https://agroecologymap.org/locations/the-food-farm/ndvi_timeline

https://agroecologymap.org/locations/forest-side-farm/ndvi_timeline

#GIS #Agroecology #NDVI #Permaculture #OpenData

🌍✨ Something big is coming! We're working on a new feature: free and open NDVI satellite monitoring using Copernicus Sentinel-2 and OpenEO. 🛰️

This future tool will help farmers, researchers, and communities track vegetation health, ecosystem recovery, and agroecological impact using open data, free software, and citizen science principles. 🌱📡

Not released yet — but coming soon. 💚🌾

#NDVI #Copernicus #OpenData #OpenScience #Agroecology #Permaculture #CitizenScience #SatelliteImagery

#GreennessOfCalgary
I’ve almost finished it!
I’ve uploaded all eight parts of “The Greenness of Calgary: A Community-Level Atlas (2025). Contrast Color Edition” to #Gumroad

Each part is a separate PDF using the “classic” high-contrast NDVI palette, optimized for visual interpretation of vegetation patterns. (The soft green palette will come later.)

I’ve created a dedicated landing page with descriptions of all releases and download links.
📎 Landing page is here: https://datastory.gumroad.com/l/qemrgul

💲 The materials are available under a “pay what you want” model — free or with optional support.

This is my first attempt at publishing geospatial analytical materials in this format. I apologise for some template-like descriptions. I hope this atlas series will be useful for researchers, enthusiasts, and anyone interested in Calgary’s urban ecology.

#Calgary #YYC #UrbanEcology #NDVI #RemoteSensing #GIS #OpenData #Geospatial #DataVisualization #Cartography #QGIS #FOSS #Canada #Alberta #RStats #Sentinel2

I like to verify my remote-sensing results directly in the field. Besides basic self-validation, field walks often generate new ideas and hypotheses.

For mobile field GIS, I use QField, loading both final map layers and custom templates for data collection.
Here’s an example from Nose Hill Park, where I checked several locations that showed a consistent NDVI increase in 2025 compared to 2024.
Field observations help confirm whether the spectral trends match real vegetation changes on the ground.

#RemoteSensing #EarthObservation #GIS #QGIS #QField #NDVI #VegetationMonitoring #Sentinel2 #FieldWork #GeoSpatial #OpenData #GeoDataScience #UrbanEcology #Calgary #NoseHillPark #Alberta #Canada #Copernicus #CopernicusSentinel #GreennessOfCalgary

Comparison of the median-seasoned NDVI for central Calgary: 2024 vs 2025

Here is a side-by-side look at how the vegetation conditions in central Calgary changed between two years, using median-seasoned NDVI maps derived from Sentinel-2 imagery.

You can clearly see the interannual differences in greenness — especially in parks, riparian zones, and residential areas with large tree cover.
The spatial patterns remain stable, but 2025 shows noticeably higher NDVI in many neighbourhoods due to more favourable moisture conditions.

This is part of my ongoing project on analyzing the vegetation dynamics of Calgary communities: #GreennessOfCalgary

#RemoteSensing #EarthObservation #NDVI #Sentinel2 #Calgary #UrbanEcology #GIS #RStats #DataAnalysis #EnvironmentalMonitoring #Copernicus #Alberta #Canada #YYC #UrbanHealth #QGIS #FOSS

🌿 Greenness of Calgary Communities (Summer 2024)
📎 https://www.datastory.org.ua/greenness-of-calgary-communities-summer-2024/

Last year I published my first attempt to analyze the actual vegetation condition across Calgary and to build a data-driven ranking of its communities based on median summer NDVI. It was my very first experiment in assessing urban greenness at the neighbourhood scale — but the results turned out surprisingly insightful.
Some patterns were expected, while others revealed unexpectedly low vegetation density in places that looked green from the ground.

This exploration later grew into a much larger line of research on Calgary’s greenness, climate resilience, and spatial variability in vegetation health. You can find some results here with thematic hashtag #GreennessOfCalgary

If you're working on urban ecology, remote sensing, or land-cover analysis of Canadian cities — I’d be happy to exchange ideas.

#NDVI #RemoteSensing #Calgary #UrbanEcology #Sentinel2 #QGIS #RStats #Alberta #Canada #EnvironmentalMonitoring #GeospatialAnalysis

Continuing my exploration of #GreennessOfCalgary

I’m working with two large geospatial datasets for the city:
• median summer NDVI for 2024 and 2025 (Sentinel-2)
• MRDEM-2024 digital elevation model

From the NDVI maps I calculated ΔNDVI, and from MRDEM I derived aspect, slope, and TPI, all resampled into the ΔNDVI raster grid.

I then asked a simple question:
👉 Does terrain aspect influence ΔNDVI between 2024 and 2025?

To check this, I:
– converted aspect values into 8 cardinal directions
– excluded flat areas (slope ≤ 2°)
– randomly sampled ~60,000 rows from the original 8.5-million-row dataset

The result:
Although the Kruskal–Wallis test detects statistically significant differences (inevitable with such a large sample size), the distributions show that aspect has almost no meaningful influence on ΔNDVI.

In other words, the observed increase in greenness in some parts of Calgary is likely driven by other environmental or anthropogenic factors, not by terrain orientation.

#NDVI #Calgary #RemoteSensing

Here is the city-wide map of ΔNDVI for Calgary — the difference between the median summer NDVI (mid-May to mid-September) in 2024 vs 2025.

As in the previous post, the signal is quite clear:
2025 shows a systematic increase in vegetation index across almost the entire city, but some areas showing a decrease.

This pattern is consistent with what I see in the frequency distributions of median NDVI:
2025 has a broader, greener distribution — likely reflecting better moisture conditions and a more favourable growing season.

Working with ΔNDVI on a pixel-by-pixel scale (10 × 10 m) offers a much more detailed picture of how vegetation responds spatially, compared with community-level averages or city-wide summaries.

#NDVI #Sentinel2 #RemoteSensing #Calgary #GreennessOfCalgary #GIS #Rstats #DataAnalysis #ESA #UrbanEcology #Copernicus #CopernicusSentinel #SustainableDevelopment #SustainableUrbanDevelopment #Alberta #Canada #EnvironmentalMonitoring #GIS #Geospatial

🌿 A noticeable shift in the statistical distribution of median NDVI values for Calgary between 2024 and 2025.

🛰️ Both histograms are based on Sentinel-2 data with 10×10 m resolution, and each NDVI value represents the median for mid-May to mid-September.

The contrast is striking:

🔥 2024 shows a distribution shifted toward lower NDVI values → drier summer, weaker vegetation growth, more heat-stress periods.
🏡 2025 is clearly shifted to the right → stronger greenness, more moisture, and more stable summer conditions.

This kind of interannual comparison reveals how much the city’s ecosystems can vary from year to year — using nothing more than open satellite data and clean statistics.

#NDVI #Sentinel2 #RemoteSensing #Calgary #GreennessOfCalgary #GIS #Rstats #DataAnalysis #ESA #UrbanEcology #Copernicus #CopernicusSentinel #SustainableDevelopment #SustainableUrbanDevelopment #Alberta #Canada

🌿 NDVI change in Calgary’s Weaselhead Flats (2024 → 2025)

This map shows how vegetation in one of Calgary’s most diverse natural areas responded to the city’s unusually wet summer of 2025.
Greener shades mark zones where NDVI increased most strongly compared to 2024 — the same floodplain and forest patches that locals know for dense canopy recovery.

Even modest year-to-year shifts in temperature and rainfall leave clear spatial traces in NDVI — a reminder of how sensitive urban ecosystems are to climate variability, and how well open-data satellite products can capture it.

🛰 Data and processing: Sentinel-2 + R + QGIS

#NDVI #RemoteSensing #Calgary #UrbanEcology #ClimateImpact #EnvironmentalMonitoring #GIS #QGIS #RStats #DataVisualization #GeospatialAnalysis #Sentinel2 #CopernicusSentinel2 #CopernicusProgram #Copernicus #GreennessOfCalgary #Alberta #Canada

🌿 Calgary’s vegetation — satellite comparison (2024 → 2025)

Median NDVI maps from mid-May to mid-September show a clear difference between the two seasons.

In 2025, NDVI values are noticeably higher — vegetation stayed greener and denser for longer.
The wetter summer had a strong effect on canopy productivity across most Calgary communities, especially in parkland and tree-covered zones.

🛰️ Based on Sentinel-2 imagery and R + QGIS processing.

#RemoteSensing #NDVI #UrbanEcology #Calgary #GeospatialAnalysis #GIS #Sentinel2 #EnvironmentalData #DataVisualization #OpenScience #EarthObservation #ClimateImpact #RStats #QGIS

🌿 Calgary Greenness Dynamics (2024–2025)

Mapping ΔNDVI between the summers of 2024 and 2025 shows how Calgary’s communities changed in their vegetation cover.

🟢 Some areas became noticeably greener this year — likely due to the wetter and milder summer.
🔴 Others show slight declines, possibly linked to construction, soil dryness, or limited tree canopy recovery.

These patterns reveal how different parts of the city respond to seasonal variability — and where future urban greening might have the most impact.

🛰️ Based on Sentinel-2 data and NDVI analysis in R.

#Calgary #NDVI #RemoteSensing #UrbanEcology #DataVisualization #GreennessOfCalgary #EnvironmentalData #GIS #RStats #GeospatialAnalysis #yyc #Alberta #Canada