tadusko.bsky.social
Tatu Leppämäki
@tadusko.bsky.social
95 followers 180 following 17 posts
PhD researcher @digigeolab.bsky.social, geographer, dog enjoyer. [email protected] over on 🦣
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
🚨 NEW ARTICLE 🚨
How many photos are uploaded to Flickr? Where? By who? Why does any of it matter? We explore the rise and fall of #Flickr in this @digigeolab.bsky.social paper by yours truly, @vuoggis.bsky.social, Johanna Eklund, Anna Hausmann & @tuulitoivonen.bsky.social out now!
buff.ly/0hJjPsm
Distribution of the use of Flickr. Three heat maps that show globes roughly centered in Europe and Africa, South-East Asia and the Americas. Use is centered in Europe and North America, and urban areas.
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Reposted by Tatu Leppämäki
digigeolab.bsky.social
Digital Geography Lab @digigeolab.bsky.social · May 20
We are very happy to congratulate our very own @ollejarv.bsky.social for receiving the Research Council of Finland Award on his work on #CrossBorder #Mobility #Transnationalism #Segregation and #NatureRecreation using #BigData such as #SocialMedia and #MobilePhone data.
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Reposted by Tatu Leppämäki
geohelsinkiuni.bsky.social
geohelsinkiuni.bsky.social @geohelsinkiuni.bsky.social · May 17
Struggling with your PhD synopsis? ✍️ Try this - The reverse-order approach! 📚🧠

@tuulitoivonen.bsky.social and @digigeolab.bsky.social have been using the reverse-order approach to structure article-based PhD synopses — and it works!

🔗 Read the full story here: www.nature.com/articles/d41...
Why you should write your PhD thesis backwards
By considering the central statement of your entire PhD, you can structure your writing around it, says Tuuli Toivonen.
www.nature.com
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Reposted by Tatu Leppämäki
digigeolab.bsky.social
Digital Geography Lab @digigeolab.bsky.social · May 8
Next up is @tadusko.bsky.social presenting his work on the rise and fall of Flickr and use of its data in geographical analyses at #LBS2025 conference.
Tatu presents his work on using Flickr for geographical analyses and whether it is actually a good idea after all. Tatu showing how the popularity of Flickr has diminished but research using Flickr data has increased.
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Reposted by Tatu Leppämäki
digigeolab.bsky.social
Digital Geography Lab @digigeolab.bsky.social · May 8
Our amazing Leyi Xu presents her work on place modeling using Place2Vec to capture euclidean and semantic aspects of POI information at #LBS2025
Leyi explaining the methodology related to assessing semantic similarity of points-of-interest.
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Reposted by Tatu Leppämäki
digigeolab.bsky.social
Digital Geography Lab @digigeolab.bsky.social · May 8
Our brilliant @matabatchi.bsky.social is presenting his work on quantifying the role of nature in tourism on global and regional scales at #LBS2025.
Matti presenting his results from the Canary Islands. Matti presenting his work on global flows of nature-based tourism.
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Reposted by Tatu Leppämäki
jurgenpfeffer.bsky.social
Jürgen Pfeffer @jurgenpfeffer.bsky.social · Apr 21
Have you ever asked yourself about the overall extent of TikTok? Here some numbers from "Just Another Hour on TikTok" - Great compliment to @bendavidsteel.bsky.social for this data collection effort!
w/ @miriamschirmer.bsky.social & Derek Ruths
arxiv.org/abs/2504.13279
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Apr 18
Oikeutettu etu on 50-50: se joko on tai ei ole. Tällainen light-versio suostumuksesta on ikävän yleinen, mutta härski temppu varsinkin valtionyhtiöltä.
jussipseppala.bsky.social
Jussi Seppälä @jussipseppala.bsky.social · Apr 15
Kannattaa käydä tsekkaamassa Oma Postin asetukset. Ovat lisänneet tuollaisen kohdan, joka on oletuksena päällä.
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Reposted by Tatu Leppämäki
waeiski.bsky.social
Tuomas Väisänen 📼🧟 @waeiski.bsky.social · Apr 15
My dear fellow researchers in #America and elsewhere!

If you are in the midst of finding a new #academic home and securing new #research #funding the Research Council of Finland is preparing a large funding call to cover the period from 2026 to 2030.

www.aka.fi/en/about-us/...
#science #phd
RCF preparing call for universities to invite foreign researchers to Finland
The Research Council of Finland (RCF) is planning a new funding call to help universities recruit international experts to Finland. The call would be part of the RCF funding scheme that strengthens un...
www.aka.fi
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Reposted by Tatu Leppämäki
dawn.fi
AfterDawn Suomi @dawn.fi · Apr 15
Posti alkaa profiloimaan asiakkaitaan

OmaPostin käyttöehdot muuttuvat ja Posti alkaa profiloimaan asiakkaitaan mm. sen mukaan keneltä saat paketteja ja kuinka usein.

Profilointia käytetään mm. mainontaan. Ohjeissamme kerromme, miten profiloinnista voi kieltäytyä.

#posti #omaposti #uutiset
Posti alkaa profiloimaan käyttäjiään - näin estät
Posti alkaa profiloimaan OmaPosti -palvelun käyttäjiä ja kohdentaa luodun profiilin perusteella mm. mainoksia omista palveluistaan. Profiloinnista voi kieltäytyä asetusten kautta, mutta se on oletukse...
dawn.fi
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tuulitoivonen.bsky.social
Tuuli Toivonen 🇺🇦🌏🌎🌍🕊️ @tuulitoivonen.bsky.social · Apr 11
Our new Associate Professor in #geography @geohelsinkiuni.bsky.social, Johanna Eklund 💎, giving her inaugural keynote talk at the Kumpula Faculty Day of @helsinki.fi 🤩

Johanna asks what actually works in #conservation and how this could be tested with #counterfactual approaches 💚
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Apr 4
Gradu #maastopyöräily'stä Pallas-Ylläksellä, Pyhä-Luostossa ja UKK:ssa. Voisivatko urheilusovellusten massadatat auttaa kansallispuistojen suunnittelussa? Mikko Kangasmaa selvitti 👆
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Apr 4
A cool new master's thesis on #mountainbiking in Finnish Lapland's #nationalparks. Mikko used #Strava and #Ridewithgps data to explore whether these sources accurately reflect where and when people like to bike. Could they even aid in managing these areas? 👇
digigeolab.bsky.social
Digital Geography Lab @digigeolab.bsky.social · Apr 3
📢 New master's thesis finalised!

"Activity tracking data for protected area visitor monitoring: A case study of mountain biking using Strava Metro", by Mikko Kangasmaa 😍

🎓 Find the thesis here: helda.helsinki.fi/items/73ae87...
📄 Find Mikko's summary here: blogs.helsinki.fi/digital-geog...
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waeiski.bsky.social
Tuomas Väisänen 📼🧟 @waeiski.bsky.social · Mar 31
Are doing #research using #Flickr data? Are you aware of the drawbacks?

Check out this cool article where researchers critically assess the use of Flickr #SocialMedia data in research on #conservation and #recreation in #nature. Key insights for #NationalPark and #ProtectedArea management.
tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
🚨 NEW ARTICLE 🚨
How many photos are uploaded to Flickr? Where? By who? Why does any of it matter? We explore the rise and fall of #Flickr in this @digigeolab.bsky.social paper by yours truly, @vuoggis.bsky.social, Johanna Eklund, Anna Hausmann & @tuulitoivonen.bsky.social out now!
buff.ly/0hJjPsm
Distribution of the use of Flickr. Three heat maps that show globes roughly centered in Europe and Africa, South-East Asia and the Americas. Use is centered in Europe and North America, and urban areas.
3 8
Reposted by Tatu Leppämäki
tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
🚨 NEW ARTICLE 🚨
How many photos are uploaded to Flickr? Where? By who? Why does any of it matter? We explore the rise and fall of #Flickr in this @digigeolab.bsky.social paper by yours truly, @vuoggis.bsky.social, Johanna Eklund, Anna Hausmann & @tuulitoivonen.bsky.social out now!
buff.ly/0hJjPsm
Distribution of the use of Flickr. Three heat maps that show globes roughly centered in Europe and Africa, South-East Asia and the Americas. Use is centered in Europe and North America, and urban areas.
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
BONUS ✨
Random highlights from the dataset:
1) Median time between capturing a photo and uploading it to Flickr is one week.
2) People (or bots) like to upload on round figures (see pic)
3) Normalized by population, Iceland has the most Flickr users in our dataset.
Uploads distributed per second of the minute and minutes of the hour. Only the first seconds and minutes diverge significantly, however, for the minutes, people like to upload on round figures (i.e., ten past, half past).
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
Thank you to #Kone & Mai and Tor Nessling Foundations for supporting this work. A quantitative work like this would not be possible without a robust suite of FOSS tools. My thanks to the maintainers of #QGIS, #pandas, #geopandas, #duckdb, #dask, #statsmodels, #jupyter and many more!
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
We hope to help future research by sharing the aggregated datasets presented above as figures and processing codes to produce them: buff.ly/qoJeQn8
Codes and derived datasets for the article: "The rise and fall of the social media platform Flickr: Implications for nature recreation research"
Processing and visualisation codes for replicating the results presented in the article The rise and fall of the social media platform Flickr: Implications for nature recreation research, Leppämäki…
buff.ly
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
So, we argue that these trends and biases should be considered if opting for Flickr data. For example, if Flickr is used a proxy does a drop tell about the phenomena or the popularity of Flickr? All research that uses user-generated dataset opportunistically face similar questions.
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
(5) Finally, we tested the reliability of data acquisition from the platform and found that the API responds inconsistently to repeated queries.
Outcome of 100 repeated queries to the API. The a pattern not unlike the normal distribution.
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
(4) All of this is reflected on who make posts from nature, or protected areas in this case. For example, Europeans and North Americans make about ¾ of the visits to African protected areas on Flickr.
Five 'chord diagrams'. They show connections between the origins and destinations of nature visitors at the level of continents. The majority of these visits are made in Europe and North America, especially as we get closer to present.
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
(3) Flickr is clearly a platform of the "Global North": it’s users and use are concentrated in Europe and North America. Over time, an even greater share of use is in Europe.
Three line charts and a map. They show how the majority of use is in North America and Europe, although normalized by population, Oceania prevails. At the same time, the spatial extent that is covered by Flickr photos has dropped. A global map of Flickr users normalized by population. Many in Northern Europe, Spain, UK, North America and Australia & NZ.
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
(2) More of that remaining data is produced by the most active ‘super-users’ of Flickr – top 1 % of users uploaded about 1 / 3 of the photos!
An area chart and a line chart. They show that few users posts the majority of geolocated pictures and that this imbalance has grown over time (expressed through Gini index).
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
What did we find? (1) the popularity of Flickr has dropped significantly over the 13 year study period. Especially the number of active users has seemingly taken a nosedive.
A set of four line and bar graphs that show the number of uploads and active users of Flickr has dropped for over a decade.
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
We address this by describing the spatial and temporal patterns of 227M geolocated photos in 2010–2022 by ~1.5M users. We focus on why this matters when studying people’s recreational visits to nature
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tadusko.bsky.social
Tatu Leppämäki @tadusko.bsky.social · Mar 28
User-generated datasets that are only incidentally useful for research purposes have a problem: little is known about them. How many observations are there? Where are those observations? Who made them? Without these, we know little about the baggage and biases brought into subsequent analyses.
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