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So I didn't see one of the base towers that day, but did visit the Martello Tower at Magilligan.

#fortifications #MartelloTower
#ListedBuilding

This is currently mapped as an undifferentiated historic=castle on OpenStreetMap: https://www.openstreetmap.org/way/177221163

I think we can do better, particularly as they were built in many parts of the British Empire. The problem is to choose a base historic key- castle, fort, defensive_work, tower - and which determines which additional key takes martello_tower as its tag.

I think this needs @BUnicycling knowledge.

@BUnicycling
@amapanda @edloach

A slightly mad #OverpassTurbo query using all wikidata items claimed to be Martello Towers: https://overpass-turbo.eu/s/1AYs

Note discrepancies with map in previous toot. Fancy there being one in County Offaly: https://www.openstreetmap.org/way/993500681

@SK53 I'll do a bit of tidying and adding #wikidata entries; there are a few more mapped in Co. Cork. #martello

@SK53 They were all already mapped on #OpenStreetMap, and I found some errors on the National Monuments map along the way. Sigh. This should be a bit more consistent and with more details: http://overpass-turbo.eu/s/1B8o
#martello

@BUnicycling There are lots (apparently?) missing on #WikiData both in & (possibly further afield too).

historic=martello_tower looks a reasonable way of avoiding a choice on the other tags too!

PS. I blame @edloach for all this as he was trying to locate tower J at Walton-on-the-Naze

@SK53 I've added some to wikidata last night, also added them to the #WikiLovesMonuments project, three more days left this year! Still some work left for others.

@InsertUser @BUnicycling @amapanda @edloach That picks up a nice example where wikidata does not follow 1 feature : 1 element https://www.wikidata.org/wiki/Q5469237

@SK53 @InsertUser @amapanda @edloach
That's due to Canmore's definition of the site(s). We get that with the NMS in Ireland all the time, where they give one number to a site with 2 high crosses, a church, a bullaun stone and a graveyard (especially with National Monuments). Messy, not good data. But they're the professionals, they know better.

@BUnicycling @SK53 @InsertUser @amapanda @edloach I don't often say this, but we should probably cut wiki*a a bit of slack here. Take https://www.openstreetmap.org/way/1213716556 for example - part of it _was_ a Martello tower but as https://en.wikipedia.org/wiki/en:Fort%20Saumarez makes clear, it's complicated.

@BUnicycling @SK53 @InsertUser @amapanda @edloach map.atownsend.org.uk now shows them: https://map.atownsend.org.uk/maps/map/map.html#20/55.19241/-6.96335