Recently, Steve Hirschorn at the National Archives has been looking at ways to visualise the information being generated by Operation War Diary Citizen Historians. As part of this work, he has taken maps found in the pages of the war diaries and, using the known coordinates of certain features contained within them, has fitted them to current satellite images using Google Earth. This process is known as georectifying and can help us assess how much the landscapes described in the war diaries have changed in the 100 years since they were written.
Over to Steve, who can tell you exactly how he’s done this…
Thanks to the efforts of volunteers using the #map hash-tag in the talk forum, it’s been easy for me to find georeference-able content. By geo-rectifying maps, it would be possible to use a GPS device to find the exact co-ordinates of anything that is documented in the maps, such as trench locations and routes, and machine gun emplacements.
Four KMZ (Google Earth/Google Maps) files are linked below. If you have Google Earth (free download available), you can use these files to view First World War maps overlaid on a recent satellite image. The KMZ files can also be imported into Google Maps, but the functionality via the website is more limited compared to the full Google Earth client.
After you have downloaded a KMZ file, you’ll see the war diary maps overlaid on the satellite view, but completely opaque. Look in the left-hand menu on Google Earth and by right-clicking an individual map item, you can select Properties and in the properties dialog box that appears, you can adjust the transparency from 0% to 100% and anywhere in between. I’ve tried to identify evidence in the current-day satellite images and street view photos of trench locations, but haven’t had much luck so far.
I’m amazed how well the most of the maps fit the current day landscape features. The odd road has disappeared here and there, but there are always enough reference points to fit the map, and they usually fit with just a bit of stretching and rotating, all of which functionality is also available in the free Google Earth client. A couple of them show trench locations (the map of Bullecourt) and machine gun placements (Ypres).
If you missed the link the first time, Google Earth can be downloaded here: http://www.google.co.uk/intl/en_uk/earth/
Steve’s map files can be downloaded using the following links:
- http://zooniverse-demo.s3.amazonaws.com/diaries_data/images/WO-95-1662-1_Bullecourt.kmz One of the better ones, a good fit to current-day road layout and showing the locations of trenches
- http://zooniverse-demo.s3.amazonaws.com/diaries_data/images/WO-95-1601-2_Ypres.kmz Another good fit, this time showing machine gun emplacements
- http://zooniverse-demo.s3.amazonaws.com/diaries_data/images/WO-95-1415-1_Hooge.kmz A map showing German trenches and the British Front Line
Lastly, as this is a new area of exploration for us here at Operation War Diary, and because none of us are experts on it, we have some questions which we hope you might be able to help us with:
- Is KMZ the best, most open format for sharing geo-rectified maps? Is there a better format?
- A bit of researching on the Internet suggests that there are ways of loading KMZ files onto a SatNav. Again, are KMZ files the best way of supporting this?
- Are there any web-based applications that enable geo-rectification of maps, and also provide a method of sharing geo-rectified maps?
- Do you have any geo-rectified maps you’ve created that you’d like to share?
- Are there any other ideas for things that we can do with the maps?
Post your answers in the comments here, or get involved on our forums at: http://talk.operationwardiary.org/#/boards
In the first eight weeks since the launch of Operation War Diary, over 10,000 citizen historians worldwide have tagged names, places and other details in over 200 unit war diaries.
Initial reports reveal some amazing statistics:
- Over 260,000 tags relating to named individuals
- Over 332,000 tags relating to places
- Almost 300,000 tags relating to activities
- The amount of volunteer effort put in so far is equivalent to one person working 40 hours a week for four years.
With your help we’re going one step further than traditional transcription by using the data to digitally map and analyse patterns and trends in the unit war diaries, offering new perspectives on the First World War. Our developers and academic advisory group are hard at work crunching the numbers from the first two months of the project – we’ll blog about their plans soon.
In addition, much of the data – particularly names and places – will be integrated into The National Archives’ catalogue (Discovery), allowing researchers and family historians to search the diaries for named individuals mentioned in the diaries. Making the data freely available to researchers in this way is hugely important to all of the project partners, and we want everyone to be able to benefit from the amazing efforts put in by citizen historians. The data will be published in this way under the Open Government Licence.
The data will also be available to users of Lives of the First World War, which we’ll tell you more about soon.
Find out more about the unit war diaries
Today The National Archives has published another 3,987 digitised First World War unit war diaries from France and Flanders online, which means that around 6,000 diaries are now available on The National Archives’ website to search free of charge (and download for a small fee). These will in time be added to Operation War Diary for tagging.
If you’d never encountered a unit war diary before tagging them for Operation War Diary, you may have been wondering what all the fuss is about and why they’re so important to researchers and historians. They contain a wealth of information of far greater interest than the army could ever have predicted, providing insight into daily events on the front line, and are full of fascinating detail about the decisions that were made and the activities that resulted from them.
If tagging the unit war diaries has inspired you to find out more, whether about a particular unit or an individual, The National Archives has many useful online resources that should help you. Our First World War 100 portal gives an overview of the millions of records that we hold relating to the war, from war diaries to conscription appeals via service records and Cabinet papers. It’s an essential starting point for anyone researching a First World War ancestor, with step-by-step guidance to help you on your way. We also have a wealth of multimedia resources, including podcasts and the popular My Tommy’s War blog series. We send out a free monthly enewsletter with news and updates relating to our work and collection – sign up today to receive your own copy!
The National Archives