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I've downloaded the coastlines of Canada and now like to delete all islands, because I need just the contiguous coastline. For this I think I should delete all closed ways with a certain size. How can I filter for area size in JOSM? |
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That would be |
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A search string like With "Expert mode" active (tick the item at the bottom of the view menu), the search window shows a hint for this search. |
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Thanks for your replies. But I have got many small areas from simplification (show as < 0.1 with measurement) which are not getting found by either "areasize:-100" or "waylength:-200". Adding "closed" to the string also doesn't change this. Can you point us to an example?
(21 Jul '18, 14:35)
Hjart
Download coastlines from overpass-turbo, export as geojson and simplify with https://github.com/maxogden/simplify-geojson
(21 Jul '18, 14:43)
norcross
Can you point us to a specific area that isn't found with the filters given above? Like i.e. https://www.openstreetmap.org/way/28296760 . Please note that the areasize filter will work for areas consisting of 1 OSM way only. The coastlines of many islands are defined by more than one OSM way. To filter those islands using the filter you will need to join the coastline ways into only one.
(21 Jul '18, 14:48)
Hjart
I think it doesn't work when opening a geojson file, only when directly downloading from the OSM server.
(21 Jul '18, 15:03)
norcross
There's a bug in the JOSM geojson parser where it doesn't close areas.
(22 Jul '18, 12:56)
maxerickson
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