#fossgis — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #fossgis, aggregated by home.social.
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Die Vernetzungsaktivitäten im Bereich Hilfsorganisationen/ Gefahrenabwehr werden weitergeführt und gemeinsam beim #Vernetzungstreffen am 02.09.2026 konkretisiert. Ziel ist eine Arbeitsgruppe @FOSSGISeV zu BOS/Gefahrenabwehr (Arbeitstitel) zu gründen.
Triff Jana und Mirco im Raum #OSM-Treff und unterstütze diese Initiative!
#FOSSGIS #OSGeo #OpenStreetMap #OpenData #Geodaten #OpenSource
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Does urban greenery yield microclimatic cooling? Spatial analysis of Calgary (Summer 2025) shows a non-linear NDVI vs LST response.
🛠 Stack: Google Earth Engine (Landsat 8/9, Sentinel-2) + R (terra, tidyverse).
📊 Key Findings:
🔹 Cooling Deficit (NDVI < 0.34): LST stays trapped at 35–36°C. Heat stress overrides evapotranspiration; saplings & isolated lawns fail to cool.
🔹 Tipping Point (NDVI > 0.34): Cooling begins above 0.34. Dense canopy (NDVI > 0.70) suppresses LST below 28–30°C (6–8°C delta).💡 Takeaway: Urban forestry can't just count saplings. Without threshold canopy density, isolated greenery is decoration, not climate infrastructure.
🔗 Link to the research:
https://www.datastory.org.ua/calgarys-summer-heat-a-2025-satellite-perspective/#RemoteSensing #GIS #RStats #rspatial #terra #tidyverse #GoogleEarthEngine #UrbanForestry #Calgary #YYC #OpenData #GreennessOfCalgary #FOSSGIS #Landsat #Sentinel2
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Which Calgary neighborhoods are best built to withstand summer heatwaves? 🌳☀️
To measure structural climate resilience across the city, I conducted a spatial analysis of 193 established residential communities, calculating the Solid-to-Tree Ratio—comparing bare artificial surfaces (asphalt, concrete, rooftops) directly against total tree canopy area.
Here are the Top 10 most shade-rich and climate-resilient communities in Calgary:
🟢 Queens Park Village — 0.3 (Just 0.3 ha of hard surface for every 1 ha of canopy!)
🟢 Discovery Ridge — 0.5
🟢 Roxboro — 0.5
🟢 Wildwood — 0.6
🟢 Rideau Park — 0.7
🟢 Medicine Hill — 0.8
🟢 Upper Mount Royal — 0.8
🟢 Crestmont — 0.9
🟢 Elbow Park — 0.9
🟢 Shaganappi — 0.9👇 The full interactive dataset and study are here:
https://www.datastory.org.ua/calgarys-microclimatic-anatomy-what-lies-beneath-the-citys-green-appearance/#UrbanAnalytics #GeospatialData #RemoteSensing #GIS #UrbanForestry #CityPlanning #Calgary #DataScience #Microclimate #MachineLearning #GreennessOfCalgary #RStats #FOSSGIS
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🌳 Is Calgary actually as green as it looks?
While open lawns (28.6% citywide) give Calgary a visual "green appearance", dry summer conditions quickly strip unirrigated grass of its cooling capacity. Meanwhile, true cooling infrastructure — dense and sparse tree canopy — accounts for only ~17%.
To quantify structural heat risks, I introduced the Solid-to-Tree Ratio index across 193 residential communities:
🔹 Critical Deficit: Downtown Core (56.2) and Beltline (24.6), where hard surfaces outnumber tree canopy by tens of times.
🔹 Suburban Pressure: New communities like Redstone (23.8) and Seton (20.8) feature high-density lots with minimal mature shade.
🔹 Ecological Buffers: River valley communities like Discovery Ridge (0.5) and Wildwood (0.6), where canopy exceeds concrete.👇 Link to the full study and interactive dataset:
https://www.datastory.org.ua/calgarys-microclimatic-anatomy-what-lies-beneath-the-citys-green-appearance/#Calgary #YYC #DataScience #GIS #RStats #RemoteSensing #UrbanHeat #DataViz #SpatialAnalysis #MachineLearning #GreennessOfCalgary #FOSSGIS #Alberta #Canada
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🌳 Quantifying Calgary’s Microclimatic Imbalance: The Solid-to-Tree Ratio
To evaluate the structural heat load across Calgary's communities, I calculated the ratio of high-thermal artificial surfaces to cooling tree canopy: Solid / (Park + Forest), based on my 2025 satellite land cover model (LULC v6.0).
Why this ratio matters:
🔹 Thermal Stress Indicator: It measures how many square meters of heat-absorbing surfaces (asphalt, concrete, roofs, bare soil) exist for every square meter of tree canopy.
🔹 Spatial Inequality: While mature western neighborhoods maintain ratios between 1.5 and 4, eastern and peripheral zones reach values from 10 to over 50.
🔹 Evidence-Based Planning: It moves the discussion from generic averages to identifying exact spatial boundaries where microclimatic mitigation is most needed.Note: The map uses a logarithmic scale.
#Calgary #YYC #DataScience #GIS #RStats #RemoteSensing #UrbanHeat #DataViz #SpatialAnalysis #MachineLearning #GreennessOfCalgary #FOSSGIS #Sentinel1 #Sentinel2
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📊 Beyond Averages: Spatial Heterogeneity in Calgary (LULC v6.0)
Averages mask reality. To capture ecological stratification across Calgary's residential communities (excl. major parks/building-out and industrial zones), I combined Violin + Box Plots:
🔹 Solid (Impervious): Median ~67% (IQR 55–74%). High-thermal non-vegetated surfaces are a systemic structural feature across nearly all neighborhoods.
🔹 Park vs. Lawn (Canopy vs. Turf): Park median (~20%) doubles Lawn (~10%). A long upper tail (>50%) highlights spatial inequality in tree cover.
🔹 Forest & Water: Near 0% for 95% of communities, but sharp needles (up to 25% forest, 16% water) mark outliers with lakes or remnant woods.
💡 Takeaway: Calgary isn't homogenous—microclimatic comfort heavily depends on geographic boundaries.Full analysis coming soon: https://www.datastory.org.ua/
#Calgary #YYC #DataScience #GIS #RStats #RemoteSensing #UrbanHeat #DataViz #SpatialAnalysis #MachineLearning #GreennessOfCalgary #FOSSGIS #OpenData #OpenSource #TreeEquity
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Es geht los: #fossgis2026 in Göttingen!
Wir sind mit unserem Team von @mundialis da, besucht uns an unserem Stand!
Und hier unsere Vorträge: -
Vom 17.-20. September findet der Junge Kongress für Geographie #JKG2025 unter dem Motto “creative. critical. changing. -
Junge Perspektiven auf die Geographie” an der Uni Leipzig statt.Der @FOSSGISeV ist mit einem Stand und einer Session vor Ort.
https://www.jkg2025.de/home#FOSSGIS #OpenStreetMap #OSM #OpenData #OSGeo #OSGeoLive #Leipzig #UniLeipzig
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Erster Entwurf einer interaktiven Bauplanauskunft, um Baupläne in Schleswig-Holstein digital und leicht zugänglich zu machen. Sie enthält keine Eigentümerangaben. Wir werden noch versuchen die Darstellung und Informationstiefe zu verfeinern und erweitern.
https://bauplanauskunft.oklabflensburg.de
#bauplan #opendata #schleswigholstein #digitalisierung #data #fossgis
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Tolle Führung durch Kartensammlung des Landesarchivs NRW. Es war sogar eine Karte mit juristischem Bezug dabei. Eine Lagekarte zur Veranschaulichung des Sachverhalts in einem Prozeß vor dem Reichskammergericht.
#fossgis2025 #FOSSGIS #openstreemap #osm #gericht #gerichtsprozess #Reichskammergericht #landesarchiv #nrw #Nordrheinwestfalen