March 25th 2023 saw the final touches on the Roscommon task, that is the mapping stage was completed; validation is still required. It had first been created in August of 2022, but the bulk of attention was given to it this year. Newish and clear Bing imagery was available for most of the county. Bing had not been updated on a small strip on the Eastern border, and Esri Clarity was used as the fallback.

Timeline of the Roscommon task

It was also the first task we mapped using the new task manager, thanks to Jonny McCullagh and Colin Broderick who performed the migration. It gives the mapper access to fancy statistics, even though it might take some time to get used to the new interface. However, the more you use it, the easier it gets 😉

Using the average mapping and validation time for the tasks, it estimates the remaining time needed for mapping and validation. However, the average time is easily off by the occasional mapper opening a task and forgetting to close it, once they give up or finish.

Guest mappers

Towards the end of the mapping process, some new mappers joined in. It turned out they were college students from University College Cork, sent by their lecturer Shawn Day. The students continued arriving and flowed over into the Longford town task which is near completion as of the time of writing. Maybe we will hear more from them about their project?

How many buildings were mapped?

According to ohsome.org, the following distribution of buildings were mapped between August 7 2022 and March 19 2023:

building typeincrease since 2022-08-07no. 2023-04-07
building52,10081,100
building=yes (to be avoided, if possible!)19,10031,000
building=house19,10029,400
building=terrace94105
building=detached4277
building=shed3,4814.400
building=garage2,9874,300
building=greenhouse255366
building=farm_auxiliary5,6918,900
building=school39129
building=church2393
building=retail43100
building=commercial1778
building=industrial12134
building=ruins6231,200
building types mapped since August 2022

Highways

The number of highways increased by 45.7% to 19,000 km since August 2022.

Road sign for county Roscommon
Source: Albert Bridge on Wikimedia Commons

Landuse

Landuse TypeArea Increase (in km2 since Aug 2022)
natural=wetland79.8
landuse=forest28.7
landuse=residential0.9
natural=wood0.7
landuse=grass0.146525
landuse=farmland0.8

Historic features

Roscommon has many lakes and wetland which makes it very interesting for someone looking for crannógs – who would that be now? Twelve hitherto ‘unknown’ crannógs were discovered and will be reported to the National Monuments Service.

There are also areas with many drystone walls, and there seemed to be many more-or-less ancient field systems. The wiki page for field systems was created as a result of that, and a video was published by myself about how to map them and what features can be found in them.

Historic FeatureNumber (as of March 27 2023)
ringfort1633
tumulus (i.e. barrow)54
field_system42
crannóg71
megalith23
holy well37
castle22
data from overpass-turbo

Validation

For those validating the tasks, the number of tags for building=yes could be be improved by using more precise tags.


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