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Aaron Zuspan

@aazuspan.dev

1.2K followers 597 following 13 posts

🛰️🌲🔥 Researcher at Oregon State University / Earth observation and fire / open source geospatial / Python / Earth Engine aazuspan.dev

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Aaron Zuspan @aazuspan.dev · 21/02/2025

I made a Github repository a few days ago to automatically track changes to the GNIS database of place names in the US. Apparently it works. #Denali

A git diff showing Denali renamed to Mt. Mckinley by executive order

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Aaron Zuspan @aazuspan.dev · 08/12/2024

The model is a stupidly simple pixel-based random forest trained with a grid of sampled points (below) using downscaled bioclimatic predictors derived from temp and precip (via WorldClim) and stretched MODIS RGB. I also tried predicting in HSV and LAB space, but RGB looked the best 🤷‍♂️

The globe from 3 different angles, showing a dense grid of colored points from dark purple to bright orange, representing annual temperature range.

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Aaron Zuspan @aazuspan.dev · 08/12/2024

For comparison, here's the actual and predicted modern imagery from MODIS. A climate-only model definitely misses some topographic and soil detail, but seems to capture land cover surprisingly well.

Title: MODIS RGB - Annual Mosaic 2020. Earth from 3 different angles in natural color, using real satellite imagery. It's an annual mosaic, so there's snow and ice around the Arctic circle.

Title: MODIS RGB - Simulated with Modern Climate. Subtitle: Based on WorldClim 2.1 1970-2000 (Fick, S.E. and R.J Hijmans, 2017). Earth from 3 different angles in natural color. Some details are missing, but it looks very much like real satellite imagery of Earth.

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Aaron Zuspan @aazuspan.dev · 08/12/2024

Am I too late for #30DayMapChallenge Day 14 - A World Map? I trained a model to predict MODIS RGB imagery from modern climate and applied it to modeled paleoclimate data to simulate a 22,000 year old satellite image of Earth

Title: MODIS RGB - Simulated at Last Glacial Maximum (~22k years ago). Subtitle: Basesd on WorldClim 1.4 downscaled CCSM (Hijmans et al, 2005). Earth from 3 different angles in natural color. It looks relatively similar to the modern world, but the northern hemisphere has much more ice and snow. Western Europe north of the Mediterranean, North America north of Kansas, and the Andes range in South America are white. Sea level was lower, so landforms are slightly larger than present day.

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Aaron Zuspan @aazuspan.dev · 13/11/2024

#30DayMapChallenge, Day 12: Time and Space 51 years and 11 million #Landsat scenes, showing global cloud-free (<20%) coverage by path and row since Landsat 1 🛰️

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Aaron Zuspan @aazuspan.dev · 10/11/2024

Fun fact, I did zero input validation 👍

Text that says "Today at 90000.00° latitude you'll see 12.00 daylight hours. Tomorrow will be 0.0 minutes shorter. You would need to travel 1.9 kilometers to keep the same day length." Meanwhile the map shows you traveling from the north pole to the southern hemisphere.

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Aaron Zuspan @aazuspan.dev · 10/11/2024

Visualizing how daylight hours change through the year depending on your latitude, for a blog post where I tried to figure out how far you'd need to travel to keep the same day length year-round (spoiler: not very far at first, then REALLY far at each equinox) www.aazuspan.dev/blog/chasing...

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