In short… In OldInsuranceMaps.net it is now possible to georeference maps with only two ground control points, instead of the previously required three. For the time being though, we’re keeping this capability hidden (more about that in this discussion and below), but I wanted to write a good summary here of how it works and why it is beneficial. Thanks to Dan VK for requesting this…
New feature on OldInsuranceMaps.net: authentication via OpenStreetMap ! A special thank you to OpenHistoricalMap for helping to fund this development :). As a new user to OIM, you can connect through OpenStreetMap right when you first sign up , or, if you are already logged into your OIM account, you can easily make a connection to your OSM account. You can read more detailed instructions in the…
We had two successful and enjoyable georeferencing events earlier this month in New Orleans, thanks again to everyone who came out! About 20 people across the two Tuesday nights. Next time around, we’ll finally mix up the schedule a bit so more people can make it out. Beyond georeferencing over 150 of pages of the Vol. 3, 1896 and Vol. 1, 1908 volumes (special shoutouts to Cacomixl , scanlan…
Upcoming Georeferencing Events in New Orleans Here in New Orleans we are looking forward to two georeferencing events coming right up! For the next two Tuesdays (May 5th & 12th) we’ll be partnering with HistoryForge to host georeference-a-thons at Second Line Brewing, just like we’ve done in the past; these will be our 7th and 8th events here! These are fairly informal gatherings, with…
Code4Lib 2026 Early last month I attended Code4Lib 2026 in Philadelphia, and gave a presentation called Old Maps for New Apps: Making and Using Georeferenced Sanborn Maps at Scale . It was a short one, 10 minutes, and while at first I thought I would be too pressed for time to give a full overview of OldInsuranceMaps.net to a new audience, I changed things around from how I usually do them and…
Last month I presented at #Code4Lib: www.youtube.com/live/6nBJ… While preparing the slides, 10 minutes was feeling really short (especially for a new audience) but I reworked some things and I think it’s actually the best introductory talk about the project I’ve given!
New newsletter platform This email is (hopefully) finding you via my new setup on Micro.blog . So, so you’ll see a different “from” address. Most importantly, unlike before, you cannot reply directly to this newsletter to get in touch . Please write separately to hello@oldinsurancemaps.net . Getting out and about Mapping USA: Video now on YouTube At the very end of January I…
Mapping USA (January 31) This coming Saturday at 1pm CST I’ll be co-presenting in a workshop at Mapping USA , a free virtual conference organized by OpenStreetMap US. The workshop, Historical Mapping with OpenHistoricalMap, OldInsuranceMaps.net, and Yesterdays will feature demos from me, Jeff of OpenHistoricalMap , and (particularly excitingly) Jacob and Mike from the new project Yesterdays…
Blog migration completed! I’ve consolidated all past blog posts and newsletters into this single feed on @micro.blog , and replaced the existing blog site at blog.oldinsurancemaps.net. Looks like some strangeness remains with dates on migrated past posts, but overall, success.
Herein: Updates on the future of OIM, some good ol' tech improvements, new blog post, and community notes. For new readers, welcome! And here are all past newsletters in case one isn’t enough. 2026 and what it will look like In mid-January, I will be leaving my position at the Healthy Regions & Policies Lab where I have been for the past 2½ years, leading or contributing to elements of…
The “multimask” is a concept in OldInsuranceMaps.net that greatly eases the creation of seamless mosaics from many different georeferenced layers. I recently made some updates to the user interface for this tool, and decided to take the time to provide a better introduction to feature as a whole. Make me a clean mosaic To understand how the multimask idea came about, consider that if…
Georeference-a-thons in New Orleans Over the next couple of weeks we’ll be holding two community georeferencing events at Second Line Brewing in New Orleans. If you are in the area, we hope you can make it! Dates: Tuesday Sept 16th & Tuesday Sept 23rd Time: 6:30-8:30pm Location: Second Line Brewing, 433 N Bernadotte St RSVP Form: https://tiny.cc/georef-2025 As we have in the past,…
Recently I gave a presentation about OldInsuranceMaps.net for I-GUIDE’s Virtual Consulting Office speaker series and I was able to talk a bit more about the technical details of the platform than I have in the past, which was really fun and a great excuse to make some more diagrams. One element of the system I described is the way that the georeferencing process relies on GDAL’s…
Hello all! Writing to tell you about a few things that have happened in the last few months, and some upcoming news. For new readers: Welcome! You can find all past newsletters in the archive . You can also respond directly to this email to say hello, and you’ll find an unsubscribe link below. Online presentation for I-GUIDE VCO series, tomorrow! Wednesday 7/16, 11am US Central Time –…
What is S3 Object Storage? S3 object storage is a protocol developed by Amazon Web Services for handling file storage outside of a normal server environment and “in the cloud” instead. In other words, it’s a simplified way of uploading, downloading, or directly accessing files that are stored in remote “buckets”. In these buckets, storage is (broadly speaking) very…
Hello and happy second month of the New Year! It is high Mardi Gras season here in New Orleans and I feel like everything is happening at the same time. For new readers: Welcome! You can find all past newsletters in the archive . Also, OldInsuranceMaps.net is now on Bluesky , come be our 2nd follower! I’ll post smaller more frequent updates there, and it will also be something people/orgs…
In case you didn’t know, GIS Day this year is next Wednesday, Nov. 20th, in the middle of Geography Awareness Week . GIS Day was started by the company ESRI (of ArcGIS reknown) many years ago, and I just learned that Ralph Nader was the inspiration behind the day. Of course, there is a lot to GIS beyond Esri, but as someone who learned about the field at the end of my undergrad and never…
Last month I traveled to the annual North American Cartographic Information Society meeting, this year in Tacoma, WA, and presented about OldInsuranceMaps.net . The video of the talk is now on YouTube: Handling Complex Content within Georeferenced Historical Atlases . You can also flip through the slides here: tiny.cc/nacis2024-ac . Even though it sounds pretty boring, this was extremely…
Upcoming Georeference-a-thons! Here in New Orleans we have two public Georeference-a-thons right around the corner! On the next two Tuesdays we will be gathering at Second Line Brewing (as before) from 6:30 to 8:30pm to georeference more New Orleans Sanborn maps for HistoryForge. We did this last summer, and the resulting work has been integrated directly into the HistoryForge platform (as you can…
Hello! The last newsletter I sent out was over half a year ago , so a lot has happened in the meantime (including: I got married!). I’ll get to most of the updates here, but hopefully will be able to follow-up sooner than later with more. Before going further, I’d like to welcome the 50+ new folks who have registered since the year started. Looking forward to hearing and seeing what…
Last November, Josh Sadvari and Michelle Hooper hosted a Georef-a-thon at The Ohio State University Libraries using OldInsuranceMaps.net , and wrote this detailed piece about how they prepared for the event, how the platform worked for them, and what kind of engagement their participants got from the experience. Piloting a Sanborn Map Georef-a-thon for GIS Day 2023 , WAML Information Bulletin,…
Hello everyone and welcome to the final newsletter of 2023! It was last January that I made an announcement letting you all know we were back in business here, and since then a lot of wonderful things have come from the project. First, a couple of recent things I haven’t yet told you about… As always, you can reply with comments or questions directly to this email (it won’t be a…
Working with Kiri and Sanjay from Development Seed, we put together this post for Dev Seed’s blog: Open Source Spotlight - Old Insurance Maps. This came about because Kiri saw my presentation at FOSS4G Southeast in Nashville last year, where I described how I had reworked OldInsuranceMaps.net to use TiTiler (open source software that Dev Seed created and maintains) for dynamic raster tiling,…
Healthy Regions & Policies Lab Speaker Series: Tomorrow! I will be presenting (virtually) to the Geography & GIScience department at the University of Illinois tomorrow, as part of the Healthy Regions & Policies Lab monthly speaker series. I’m really looking forward to this–it will largely be an introduction and summary of OldInsuranceMaps.net, but I also plan to highlight a bit of the…
Working with the HistoryForge team we have gotten the mosaicked New Orleans 1895, vol. 1 edition into their web map interface! You can find it in the map overlays at https://sela.historyforge.net/forge . (Also admire the Robinson Atlas and other layers Elizabeth has added while you are there!) Some may recall this edition was the focus of our first georeference-a-thon this past summer. Happy to…