Diary Entries in English

Recent diary entries

Power shutdown 1100hrs UTC August 18th to 0100am UTC August 19th

Posted by muninn_project on 17 August 2019 in English (English)

A power shutdown of the machine room for pre-semester maintenance will occur tomorrow. The length of the shutdown should be less than the window and services will return gradually afterwards. Overpass API may be slower due to processing issues.

Please see

Switching over to HTTPS

Posted by muninn_project on 26 July 2019 in English (English)
  1. All OHM services are now available over https
  2. Next week, the main login will now only work over HTTPS.

The http page will redirect to the https page; please be sure to update the url in your applications.

Norfolk Land ownership

Posted by Gideonsway on 30 June 2019 in English (English)

I am currently working on a project using Enclosure, Tithe and old OS maps to examine land ownership in sampled Norfolk villages. I am partucaly interested in loss of land access, loss of Common Rights and the creation of “landless labourers” as a result of the Enclosure Movement of the C18 & C19th.

Location: 52.709, 1.539

Mapping Historical Railways in New Zealand

Posted by NZ Rail Maps on 22 June 2019 in English (English)

As I already maintain the NZ Rail Maps project at then adding the historical data from these maps is my current focus.

Old Survey Map Accuracy

Posted by NitaRae on 11 May 2019 in English (English)

Most of the survey map I am working from were generated between 1825 and 1855. These are the result of a 30 year effort to produce an accurate and reasonably complete set of surveys for the territory/state of Florida. Survey's were conducted in the field by a 4 or 5 man crew consisting of a Deputy Surveyor, two chain-men, and an ax-man. These were rugged and inhospitable virgin woods. The crew was paid $4-$6 mile to do the field work. Payment computations are on the margins of the plat sheets.

Surveyors working in the field were required to leave physical indicators of township, range and section corners. They may have been an iron pipe, and a heavy wooden stake. Because of the high probability that the survey markers would be disturbed, or degraded with time, trees in the immediate area of the corner were designated witness trees. Their exact position relative to the corner was documented and recorded in the field notes. The witness trees were usually marked with a cat-face, or chevrons, to positively identify them. Some of those marked trees survived beyond 100 years of age, and a rare few made it to 200 years. One tree, was documented as germinating several years before the constitution was signed. It was inadvertently cut down around 1981.

The initial result of the field surveys was a hand written note book, giving dates, measurements, compass headings, etc. This information was being calculated in the field using basic equipment, which was state of the art for the day. The completed field notebooks were returned to the land office responsible for that part of the state. There, the numbers would be verified, and a drafts-person would generate a visual survey document. That would have to be rechecked for errors, before being approved by the surveyor general, or one of his deputies.

Comparison of the finished sheets, to current USGS topographical maps, suggests that the drafts-persons may have used a wee bit of literary license with some of the drawings. The features may well have existed, but their placement might not always be spot on. So beware,

Mapping historical data again

Posted by NitaRae on 11 May 2019 in English (English)

I have now begun mapping historical data along the Florida Nature Coast. This will be primarily based on historical BLM land surveys. How and where this data fits into modern features is vastly of interest to me.

Location: 29.611, -82.690

Ivybridge, Devon

Posted by Victor on 7 December 2018 in English (English)

I would like to plot the historical items I have found in the local area. I started with the local history of early Ordnance Survey field work (1795-1809 & 1848/9) but this has grown into water use & waste disposal, and I would like to include changes to roads, particularly the local Turnpike.

Mapping all early 20th Century Railways in Ayrshire and Glasgow

Posted by Hunterston on 5 June 2017 in English (English)

I have started to map all the old railway lines, tramways and mineral railway lines in Ayrshire and Glasgow and facinated how many lines there used to be. This would be a great project for others to get involved with. The map I am using is the OS County Series mapping at Six-Inch to the mile / 1:10,560 for the 2nd edition, dating between 1888-1913{z}/{x}/{y}.jpg

Anyone wanting to help get in touch, maybe we can expand the area once the inital area is complete.

The good thing about using OHS is its specifically for subject concerned and not a mix of things that are not of interest. Yes, roads and the occasional building can be added but main objective is to record every single rail line and once complete have a slider view with google/bing that can overlap and compare old and new.

Location: 55.640, -4.790

Looking forward; better API performance, Linked Data and rendering

Posted by muninn_project on 11 April 2017 in English (English)

As the Open Historical Map stabilizes into new hosting, there is finally time to breathe a little and look forward to improvements in the front-end.

Earlier this week, the data uploaded in Changeset 1430 about the Battle of Vimy Ridge was pushed into a map rendered by the WikiWar Guys and partially derived from data gathered from the Canadian Expeditionary Force Study Group.

I would like to see the OHM have a Linked Open Data aspect to it's API to push out more data in a machine friendly way to make it easy to integrate with other data sources. That renderer project to have a time slide option for the tile server is still something that I would like to see realize.

Interestingly, the OWL-TIME standard is being worked on at the W3C which has some interesting ideas for us to look at in using time notations for objects.

This Project?

Posted by Joebob05 on 7 April 2017 in English (English)

Well, it appears that this project never really got of the ground! That is a real shame.

The editor's need a lot of work. If this is a historical mapping project why in god's name is there tag references to "malls", "motels", and other modern amenities and structures but nothing for something as obvious as a mill (wind, water, steam). These were around for hundreds of years, most of which have done with time, and no way to add them to the map properly.

There is no quick and easy "help" for using the site/project as a contributor. This I find is the case with these projects nowadays. Project developers assume everyone has a Phd. in computing technology and leave it all to guesswork by the end user. Some features simply do not work. Open the in-house editor, add a node (point of Interest [POI]) and try to save it using Ctrl s. Well, if the developers actually used the editor they would find out that Ctrl s is trapped by the browser first and tries to save the web page (html). Oops!

The person/people who set this up are either very lazy or have no clue how to do a project like this. How do I contact them to help fix the project tools? It would be more important to do that before plowing ahead with frustrating dead ends for the users/contributors!

I was thinking of reviewing all the BBC Time Team programs (~160) to catalogue all the sites they worked and their discoveries at each location. The results should be placed in a project like this. However, I would be very reluctant to do so if the project platform is not likely to survive.

Regards; Joe Rose

Location: 51.289, -1.099

Mapping the Past with Linked Data in OpenHistoricalMap

Posted by Abbe98 on 26 March 2015 in English (English)

Proposing linked data tagging scheme:

Mapping the Past with Linked Data in OpenHistoricalMap

Location: 58.766, 17.019

Mapping the Past with OpenHistoricalMap and JOSM

Posted by Abbe98 on 3 March 2015 in English (English)

JOSM gives you the power to do OpenHistoricalMap mapping offline, use custom filters, use custom base maps without tools like Map Warper and much more.

Mapping the Past with OpenHistoricalMap and JOSM

Location: 58.766, 17.019


Posted by Abbe98 on 7 January 2015 in English (English)

I could not find any used solution for marking up information as hypothetical so I did it in my own way.

For dates OHM seams to use start_date/end_date(that's at least what I have been seeing).

So when I decided on how I would mark up hypothetical information I wanted to be flexible. I started with ohm:hypothetical, then follows the tag/key that's hypothetical. for example a hypothetical start_date would look like: ohm:hypothetical:start_date=yes this would also allow the value to be no for none hypothetical information.

The reason not to use ohm:hypothetical=<tag-name>" is that then you can't have more then one ohm:hypothetical tag(OSM does not allow duplicate keys).

Example uses:

  • ohm:hypothetical:name=yes
  • ohm:hypothetical:start_date=yes
  • ohm:hypothetical:end_date=no
  • ohm:hypothetical:landuse=yes
  • ...

For marking up a hypothetical location I can see two approaches one is to just have ohm:hypothetical:ohm:location=yes another is go with ohm:hypothetical=yes.

Another approach to the problem would be to just append the hypothetical key with :hypothetical or :verifiable,

If it does exist a common solution I can replace my one, but I could not find one...

Anyone else that have been marking up any data as hypothetical? How did you do this?

Feedback on this?

The tags start_date/end_date should they be ohm:start_date/ohm:end_date? They are OHM specific as far as I know.

Location: 59.078, 16.376

Getting Started

Posted by Tod Robbins on 2 July 2014 in English (English)

Who wants to work on a "getting started" guide for OHM? I'd love to collaborate and learn more about the platform.

Location: 40.589, -112.006

Hi Guys

Posted by lmirza3 on 9 June 2014 in English (English)

So, I'm not sure how many people are on this website. I just made this account today. I was going to start working on a historical map of the Chicago "L" Train system based on year. Are we allowed to contribute to the building of the time/date slider?

Location: 41.870, -87.647

It's working again

Posted by chippy on 22 April 2014 in English (English) is working again... well the website only at least

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