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Stephen Gadd

@docuracy.co.uk
646 followers 182 following 80 posts

Assistant Research Professor @camunicampop.bsky.social Technical Director, World Historical Gazetteer @whgazetteer.org Research Associate & GIS Consultant @ihr.bsky.social & @layersoflondon.bsky.social

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Reposted by Stephen Gadd
kgeographer 🇺🇦 🇬🇪 🇦🇱 @kgeographer.bsky.social · 10/09/2026
🧵 The Environmental Dimensions of Place Service (EDOPS) v0.4 is live: edops.computingplace.org Give it a place (settlement, historical polity) & get a structured "environmental signature" of the drainage basin(s) it occupies: hydrology, climate, terrain, etc. + climate & land use over time 1/3
Home page of the Environmental Dimensions of Place Service (EDOPS), with links to its 3 principal pages, Sandbox, Workbench, Data Explorer
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World Historical Gazetteer @whgazetteer.org · 28/08/2026
Inspired by @sharonhoward.bsky.social's beautiful mapping of @thegozfather.bsky.social's catalogue of pleadings in the Court of Requests, we're building a new Workbench tool to help identify place names from the descriptions. worldhistoricalgazetteer.github.io/workbench-de...
Heatmap of England and Wales showing the density of places identified (or misidentified) from the TNA descriptions of its Elizabethan-period pleadings in the Court of Requests.Map popup showing detail of a case relating to Spon Street, Coventry, and a link to the record in the TNA online catalogue.
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World Historical Gazetteer @whgazetteer.org · 01/06/2026
Trying something new: feeding old print gazetteers through modern OCR + open LLMs + our newly-expanded index to see how much can be turned into searchable, mappable data. Read more at blog.whgazetteer.org?p=434 Play with it: worldhistoricalgazetteer.github.io/gazetteer-of...
Global heatmap of the roughly 116,000 places extracted from A Gazetteer of the World (1856), plotted on a world basemap. Density is highest across Britain and Europe, South Asia, and the eastern United States; sparser across much of Africa, South America, and the interior of Asia, reflecting the 1856 compilers' Anglocentric reach.
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World Historical Gazetteer @whgazetteer.org · 22/05/2026
🕵️We're transcribing and geocoding all 7 volumes of "A Gazetteer of the World" (1856), a monumental work edited anonymously by "a Member of the Royal Geographical Society" @rgs.org - can anyone suggest who that might have been, and why they might not have been named? archive.org/details/agaz...
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Stephen Gadd @docuracy.co.uk · 19/05/2026
Companion to the Datini Letters map: a new Voyages explorer for the Melis archive. 3,393 Mediterranean ship records (1379–1492). Arcs coloured by predominant vessel type per route. Ports geocoded via @whgazetteer.org. docuracy.github.io/datini/viagg... #DigitalHumanities #DH #MedievalMed
Map of the Mediterranean and adjacent waters on a dark basemap, showing 3,393 ship voyages from the Melis archive (1379–1492) as curved arcs between origin and destination ports. Arc colour encodes the predominant vessel type on each route: red for galleys (galea, galeotta, fusta, saettia), purple for cogs and carracks, gold for general sailing ships (nave, navetta, panfilo), teal for Mediterranean coastal traders (liuto, rampino, vacchetta), magenta for brigantines and pinnaces, sky-blue for boats and small craft, muted purple for unspecified types. Arc width scales to voyage count per route. The densest threads cluster across the western Mediterranean between Italy, Catalonia and the Balearics, with prominent reaches out to North Africa, the Aegean, the English Channel and the Atlantic. A left-hand sidebar lists filters — dated-only toggle, year range, vessel-type chips colour-matched to the map — and a legend giving each category's example types.Screenshot from the Datini Voyages map in Travel Time mode, zoomed on the north-western Mediterranean. A curved green-yellow arc connects Pisa on the Tuscan coast to Aigues-Mortes on the French Languedoc coast, with both ports drawn as small blue circular markers. The arc's colour places this route on the duration gradient at roughly 14 days — between the cyan (0–5 days, fast) and magenta (60+ days, slow) extremes shown in the sidebar legend. A popup over the arc reads "Pisa → Aigues Mortes": 10 voyages recorded, average 14 days from 1 dated voyage, years 1386–1402, top vessel type "nave" (ship). The left sidebar mirrors these numbers in the Selected Feature panel and lists each individual voyage with its date range, duration and ship type below.
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Stephen Gadd @docuracy.co.uk · 10/05/2026
🔔 A heavy church bell meant a heavy cart and a way capable of bearing it. Can the spread of bells >5cwt from their foundries serve as a proxy for pre-modern wheeled-transport networks, at least where navigable waterways can be ruled out? 1/5 #HistoricalGIS #EconomicHistory #TransportHistory
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Cambridge University History Faculty @camhistory.bsky.social · 05/05/2026
How @camunicampop.bsky.social researchers are turning static snapshots of Victorian Britain into dynamic life histories. The team are linking over 200 million census records, revealing how people moved, worked and lived in ways never before possible. 🔎 Read on 👉 www.hist.cam.ac.uk/news/tracing...
How researchers are linking over 200 million census records to transform historical research
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Stephen Gadd @docuracy.co.uk · 04/05/2026
New in the Datini Letters explorer: click any city to focus on its correspondence routes. Shareable links capture the full state of the view. docuracy.github.io/datini/#mode... #MedievalSky #DigitalHumanities
Screenshot of the Datini Letters Geospatial Explorer in Travel Time mode, focused on Avignon. A dark map of the western Mediterranean shows curved arcs fanning out from Avignon, coloured on a cyan-to-magenta scale by average letter delivery time: short hops to nearby French and Catalan cities run cyan and green, while longer routes across the sea or to Italian fondacos shade through yellow and red. A popup over Avignon lists letters sent and received, country, active years and top correspondents.
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Stephen Gadd @docuracy.co.uk · 01/05/2026
✉️ Explore 145,000 medieval merchant letters as a live map: the correspondence network of Francesco di Marco Datini (c.1363–1412), spanning Florence to Barcelona to North Africa. Visualise routes, travel times & seasonality. docuracy.github.io/datini/ #DigitalHumanities #MedievalHistory
A dark-themed interactive map of the medieval western Mediterranean showing 14th-century merchant letter routes as curved arcs coloured from cyan (fast, 0–5 days) through yellow to red (30+ days). Short land routes between Tuscan cities glow cyan; longer sea routes to Barcelona and Majorca burn orange and red, revealing the unpredictability of medieval maritime travel.
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Long (accessible description for screen readers / figure caption):
Screenshot of the Datini Letters Geospatial Explorer in Travel Time mode. A dark basemap of the western Mediterranean is overlaid with curved arc lines connecting pairs of cities in the Datini merchant network. Arc colour encodes average letter delivery time on a gradient from cyan (near-instant, 0–5 days) through green and yellow (one to two weeks) to orange and deep red-magenta (more than 30 days). Dense clusters of fast cyan arcs radiate from Florence and Pisa across Tuscany, reflecting the reliable day-or-two land post. Arcs reaching westward to Barcelona, Valencia, and Palma de Majorca shift to orange and red, capturing the slower and far more variable sea routes that could take anywhere from a week to several months. City nodes are shown as circles: pink for the main Datini fondacos (Pisa, Florence, Barcelona, Genoa, Valencia, Majorca) and blue for correspondent cities. A sidebar on the left shows the Travel Time mode is selected, with a cyan-to-red colour legend and a filter slider for minimum letters per route.
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Stephen Gadd @docuracy.co.uk · 11/03/2026
Medieval Markets & Fairs in England & Wales: remember the excellent dataset published back in 2003? I've given it a snazzy new interface, incorporating various updates which were made following publication. Separately, I'm working on extending it to 1846... ihr-digital.github.io/markets-and-...
Image showing the new interface for the 2003 Medieval Markets & Fairs dataset.
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Stephen Gadd @docuracy.co.uk · 19/12/2025
Fun piece by @justincolson.bsky.social and Werner Scheltjens. My job on this project is to turn messy medieval records into a tidy database so that my colleagues can more easily spot trends in fashion, industry, and commercial networks. theconversation.com/medieval-lon...
theconversation.com
Medieval Londoners’ cheaply imported mass-produced Christmas gifts look surprisingly familiar
We often imagine medieval life as dull, dirty and short, with little in the way of material comfort or decoration. However, medieval Londoners were importing toys, treats and trinkets by the boatload ...
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Gabriel Bodard @palaeofuturist.bsky.social · 11/11/2025
(4) Linking Knowledge Through Place: ISHI, WHG, and the Future of Gazetteer Collaboration, with @rmostern.bsky.social @docuracy.co.uk, Alexandra Loranna, Palak Vashist. Look at Institute for Spatial History Innovation & World Historical Gazetteer. Register to participate at forms.gle/dzSq2GibT17n...
forms.gle
Linking Knowledge Through Place: ISHI, WHG, and the Future of Gazetteer Collaboration
Description: This activity focuses on advancing collaborative methods for historical place alignment across gazetteers and related datasets within the Pelagios community. It brings together members of...
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Gabriel Bodard @palaeofuturist.bsky.social · 10/11/2025
Linked Pasts 11 programme (December 1–5 and some 8–12) linkedpasts.hcommons.org/2025/11/09/l...
linkedpasts.hcommons.org
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Dr Trixie Gadd @trixiegadd.bsky.social · 03/10/2025
This week's fungi for #FungiFriday.
Death cap and false death cap, red and orange fly agaric, lawyer's wig, penny bun and blusher.
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Dr Rebecca Tyson @tyguson.bsky.social · 02/08/2025
Today I start my research trip sailing down the River Seine from Paris to Honfleur (via a few stops) in a reconstruction of the Klåstad cargo ship built in 998. It’s the penultimate stage in the ship’s journey from Rome to London throughout the summer. I’ll post updates as we go #Saga25 #MedievalSky
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Stephen Gadd @docuracy.co.uk · 19/07/2025
Hours of fun spent realigning my foolishly London-centric assumptions about medieval European trading networks. Shetland, for example, was far from peripheral: a non-Mercator map-projection helps. I've rebuilt the journey-timed, square-rigged sailing algorithm for docuracy.github.io/Historical_S...
Map of northern and western Europe showing computed square-rigged sailing routes between the Baltic Sea and Spain. Outward journeys curve northwest via Shetland and the North Atlantic, while return journeys favour the English Channel. This asymmetry arises from prevailing winds, currents, and the hydrodynamic limits of medieval sailing vessels. A spherical (non-Mercator) projection is used, better reflecting great-circle geometry and the true spatial relationship of regions such as Scandinavia, Shetland, and Iberia.
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Stephen Gadd @docuracy.co.uk · 05/07/2025
Thanks, @drpda.bsky.social, this looks like a really useful source, as it includes dates and waypoints for a number of long-distance voyages. 👏 I'd love to get hold of Paula Martin's transcript, though: any suggestions of how I might do that?
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Stephen Gadd @docuracy.co.uk · 05/07/2025
🌍 Ports are now (optionally) shown on the eRutter to help with route picking. 🤔 They're currently fetched from @wikidatacommunity.bsky.social, but this would be a great use case for a @whgazetteer.org temporal API to filter out modern ports and highlight ancient ones.
At low zoom levels, cluster markers indicate the locations of ports.At higher zoom levels, each port gets its own marker, coloured by category.
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Stephen Gadd @docuracy.co.uk · 04/07/2025
🪄Historical Sea Routing is now much quicker to load, reload, and compute seasonally-plausible sailing routes, thanks to some behind-the-scenes browser magic. Find a 6500-mile return trip in under 1 second! 🛟 Do you have historical voyage data which might help with calibration? [1/3]
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Stephen Gadd @docuracy.co.uk · 02/07/2025
🌍 I've just published this here docuracy.github.io/Historical_S... for anyone to play with. Screenshots, code, and caveats at github.com/docuracy/His....
docuracy.github.io
Sea Router
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Stephen Gadd @docuracy.co.uk · 16/06/2025
🧭 Building a lightweight sea-routing graph for historical GIS & DH use cases beyond simple port-to-port hops. Edges are weighted for ~5km coastal preference. Aiming for serverless exploration of connectivity in historical maritime trade. ⚓️ #MaritimeHistory #HistoricalGIS #DigitalHumanities
Diagram of historical sea routing graph for Europe.Diagram of historical sea routing graph for Europe, showing (in red) weighted edges in the zone favoured for coastal sailing (~5km).
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World Historical Gazetteer @whgazetteer.org · 11/06/2025
Want to work with the WHG team? The Institute for Spatial History Innovation @ Pitt is hiring a full-time Research Associate to be the Digital Data Specialist & Managing Editor of World Historical Gazetteer! Learn more & apply by July 11: bit.ly/4kAknki @rmostern.bsky.social @docuracy.co.uk
bit.ly
Job Opportunity - Research Associate at Institute for Spatial History Innovation | World History Center | University of Pittsburgh
The University of Pittsburgh's Institute for Spatial History Innovation (ISHI) is currently accepting applications for a full-time Research Associate to act as the Digital Data Specialist. The selecte...
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Isabelle Marie @isabellemarie.bsky.social · 11/05/2025
Medieval England’s Road Network Mapped Using the Gough Map. www.medievalists.net/2025/05/medi...
medievalists.net
Medieval England’s Road Network Mapped Using the Gough Map - Medievalists.net
A new study uses the Gough Map to reconstruct medieval England’s road network, revealing how Roman routes shaped travel for centuries.
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World Historical Gazetteer @whgazetteer.org · 30/04/2025
🌍 Recent updates to the WHG user interface give faster loading and globe visualisations. Image: Indigenous Place Names in North America, a WHG Place Collection at doi.org/10.60681/whg... Explore more at: whgazetteer.org ! #DigitalHumanities #HistoricalGIS #GeoHumanities #HistoricalGeography
Globe visualisation of Indigenous Place Names in North America, a WHG Place Collection [https://doi.org/10.60681/whg-collection-172]
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Hobnob Press @hobnobpress.bsky.social · 31/03/2025
Discover 17th century travel through the eyes of John Walker in our new release. Edited by Anthea Jones. www.hobnobpress.co.uk/books/p/john...
hobnobpress.co.uk
John Walker's Commonplace Book: A Traveller in the 1670s, edited by Anthea Jones — Hobnob Press
Travelling for pleasure in the 1670s required plenty of stamina. John Walker, a well-to-do country gentleman in his early thirties, rode many miles on horseback through England, Wales and Scotland, an...
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Stephen Gadd @docuracy.co.uk · 30/03/2025
👇Results from my latest version of desCartes, a hybrid machine learning system for detecting roads on old maps. Its 0.76 IoU score for roads is 31% better than the closest benchmark. 🤯 Preprint forthcoming on arXiv.
The robustness of the desCartes Ilastik-Segformer-b4 model's road segmentation is illustrated in these images, which demonstrate accurate discrimination between main roads (red), minor roads (green), semi-enclosed paths (orange), and unenclosed paths (yellow) in diverse urban and rural environments.The robustness of the desCartes Ilastik-Segformer-b4 model's road segmentation is illustrated in these images, which demonstrate accurate discrimination between main roads (red), minor roads (green), semi-enclosed paths (orange), and unenclosed paths (yellow) in diverse urban and rural environments.The robustness of the desCartes Ilastik-Segformer-b4 model's road segmentation is illustrated in these images, which demonstrate accurate discrimination between main roads (red), minor roads (green), semi-enclosed paths (orange), and unenclosed paths (yellow) in diverse urban and rural environments.The robustness of the desCartes Ilastik-Segformer-b4 model's road segmentation is illustrated in these images, which demonstrate accurate discrimination between main roads (red), minor roads (green), semi-enclosed paths (orange), and unenclosed paths (yellow) in diverse urban and rural environments.
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James Baker @jwbaker.bsky.social · 14/03/2025
The 2025 Richard Deswarte Prize in Digital History celebrates the best of digital history internationally. You have until 30 May to nominate your work or work you love. Please consider doing so. ihrdighist.blogs.sas.ac.uk/2021/12/the-... #dhist
ihrdighist.blogs.sas.ac.uk
The 2025 Richard Deswarte Prize in Digital History - Digital History Seminar
**SUBMIT HERE BY 30 MAY** Richard Deswarte (1965-2021) was one of the founding convenors of the Digital History seminar at the Institute of Historical Research (IHR), University of London, an advocate...
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Alexis Litvine @alexislitvine.bsky.social · 03/03/2025
Really enjoyed working on this with Stan Hinton and would love to get some feedback on methods and findings from anyone out there. All criticicsm welcome, this is what WPs are for!
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Cambridge Group for the History of Population & Social Structure @camunicampop.bsky.social · 06/02/2025
📣New blog post alert! 📣 Who had access to common land in the past, and how extensive were common rights? Our latest blog post by Leigh Shaw-Taylor demonstrates that it was not such an open system as we might assume, even before enclosure... www.campop.geog.cam.ac.uk/blog #skystorians
campop.geog.cam.ac.uk
The Cambridge Group for the History of Population and Social Structure, Cambridge Top of the Campops: 60 things you didn't know about family, marriage, work, and death since the middle ages
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Stephen Gadd @docuracy.co.uk · 22/01/2025
@layersoflondon.bsky.social
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Stephen Gadd @docuracy.co.uk · 04/01/2025
Inventor Alexander Lagerman's beautiful machines in the Matchstick Museum (Tändstickmuseet), Jönköping, including a fairly early (1892) industrial example of non-circular gears. 👌🏻 sv.m.wikipedia.org/wiki/Alexand...
Detail of Alexander Lagerman's "complete machine" for making matches.Non-circular gears. Detail of Alexander Lagerman's "complete machine" for making matches.Detail of Alexander Lagerman's "complete machine" for making matches.Detail of Alexander Lagerman's machine for making matchboxes.
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Margot Finn @eicathomefinn.bsky.social · 29/12/2024
Even when the Bayeux Museum closes for renovations in September, you can access the Tapestry online here. A treat for #Skystorians
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Rainer Simon @aboutgeo.bsky.social · 23/12/2024
Today I'm launching #liiive: a new IIIF viewer that puts real-time collaboration front and center. View, annotate, and discuss together as if you're in the same room. Just paste a manifest URL and go! liiive.now 🎄 #DigitalHumanities #IIIF #DH #ArtHistory #Museums
liiive.now
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Dr Bendor Grosvenor FRHistS @bendorgrosvenor.bsky.social · 17/12/2024
I don't see many long threads on here, but I'll try one - it's about Holbein's Ambassadors, his 1533 masterpiece in the National Gallery. It's often presented as a great mystery, but I think once we understand the circumstances in which it was made, its meaning becomes clearer. 1/
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Justin Colson @justincolson.bsky.social · 02/12/2024
Excited to have received funding from @ukri.org AHRC and @dfgpublic.bsky.social to work with Werner Scheltjens at Univ. Bamberg for our project Unlocking Upcycled Medieval Data: North Sea Networks, People, and Commodities in the London Customs Accounts 1380-1560'
history.ac.uk
Unlocking Upcycled Medieval Data
Examining the consumer culture of the fifteenth century through digital analysis of London's medieval customs accounts
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Brodie Waddell @brodiewaddell.bsky.social · 23/11/2024
For every noble or gentleman who did the 'Grand Tour', there was one or more servants who did it with them, but these men and women have been mostly invisible and unheard. @richardjansell.bsky.social's new edition finally gives us access to their perspectives and their #WrittenWorlds!
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Dr Cathryn Pearce @cathrynpearce.bsky.social · 20/11/2024
Attended a IHR/People, Place and Community @chppc.bsky.social seminar. Intrigued about the National Archives project on Ravenser Odd, a community that rose from the sea in the c13th century in mouth of River Humber, and then lost again. #CoastalHistory beta.nationalarchives.gov.uk/explore-the-...
beta.nationalarchives.gov.uk
Ravenser Odd
Ravenser Odd was a short-lived island in the mouth of the River Humber. It rose from the sea in the early 13th century and had sunk beneath the waves again by 1360. Documents at The National Archives ...
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Stephen Gadd @docuracy.co.uk · 19/11/2024
Age yourself with your first #computer 1977, TRS-80 🤯 The "80" made it sound ever so futuristic, though that referred to its 8-bit processor. en.wikipedia.org/wiki/TRS-80
en.wikipedia.org
TRS-80 - Wikipedia
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Peter Gilliver @petermgilliver.bsky.social · 18/11/2024
A fresh reminder/plea, as this place has grown quite a bit since my last, er, autotrombation. The website now has a couple of dozen more articles. Please spread the word.
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Stephen Gadd @docuracy.co.uk · 16/11/2024
One for you, @clha.bsky.social?
bsky.app
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Layers of London @layersoflondon.bsky.social · 14/11/2024
Hello! We are over here now. Come and explore our more than 400 historic maps of London available to view on our website. Which is your favourite? layersoflondon.org/map?layers=t... #Maps #GIS #HGIS #SpatialHumanities #DigitalHumanities #GeoHumanities #StoryMaps #MapMonday
layersoflondon.org
Layers of London
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Institute of Historical Research Wohl Library @ihrlibrary.bsky.social · 09/11/2024
The library is a rich resource for anyone researching British and Irish #localhistory. But we also have local history holdings in many other collections, including Germany, Latin America, Italy and US States to name a few. Browse the library pages to find out more www.history.ac.uk/library-digi...
A collage image showing a selection of local history titles from several of the IHR library's collections, including our Low Countries, French, German, Mexican and Italian collections.
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The Pelagios Network @pelagios.bsky.social · 07/11/2024
Given current events, this seems to be the right time for us, Pelagios, to be joining bluer skies. Who are we? We are a free and open association of equal and interdependent Partners from the digital humanities, GLAM sector, and data science field, working to make linking data online really easy.
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Stephen Gadd @docuracy.co.uk · 12/11/2024
Building on foundations laid by @kgeographer.bsky.social, we're constantly looking for ways to cement @whgazetteer.org in the #DH ecosystem. Ideas and followers welcome!
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Stephen Gadd @docuracy.co.uk · 12/11/2024
Do you know of this bundle, @judyzara.bsky.social ?
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Tom Elliott @paregorios.bsky.social · 08/11/2024
I have just put up a design spec for a "Linked Data" sidebar portlet I hope we can add to #PleiadesGazetteer place pages before the winter break. github.com/isawnyu/plei... Comments and suggestions are welcome on the ticket on GitHub. Boost as you will. #DH #gazetteers #LinkedData
github.com
Implement a "linked data" portlet in the right sidebar · Issue #524 · isawnyu/pleiades-gazetteer
To replace the functionality of the defunct Peripleo sidebar, we need a new right-side portlet to appear alongside every place page that provides links to external sites that claim to provide infor...
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The Viabundus Map @viabundus.bsky.social · 20/03/2024
Viabundus 1.3 ("St. Gertrud") is online! The most notable new feature is, that you can include stations to your route, so you can better follow itineraries in your sources.
The viabundus map shows a zig-zag of a velvet line that goes from Aarhus via Gdansk, Leipzig, Görlitz, Prague, Frankfurt/Main, Cologne, Bruges and Magdeburg to Lübeck. This itinerary is absolute bogus, of course. On the other hand, who knows?
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