I recently downloaded a map of the United Kingdom from http://garmin.openstreetmap.nl/ and installed it on an Etrex 30. I found that lakes and ponds (e.g. https://www.openstreetmap.org/#map=17/50.80484/-1.18653) do not render in blue as they used to. I also noticed that when the cursor is left on a blank area of the map, it is identified as 'Great Britain', which is also new behaviour. The same problem occurs on a Garmin Colorado, and occurs with much larger lakes (e.g. Windermere). A map downloaded from the same site in January renders correctly on Garmin devices, and the map still renders correctly on the OSM website. I asked a similar question a long while ago (https://help.openstreetmap.org/questions/12148/rendering-of-lakes), and some helpful people told me about multipolygon relations, which fixed the problem. Has an entity called 'Great Britain' recently been created, and is the Garmin rendering engine seeing it as a kind of land use? Sorry, I'm guessing, but I cannot see how to fix the problem.

Additional information: While trying to determine whether the problem is in the OSM data, the preparation of the downloaded Garmin 'img' file or the Garmin GPS software, I found that the 'img' file renders correctly in BaseCamp. Unfortunately I do not know enough about map rendering to determine where the fault lies. Can anyone help?

asked 05 Apr '16, 22:28

Madryn's gravatar image

Madryn
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accept rate: 13%

edited 10 Apr '16, 11:25


Yes, a 4598-member multipolygon relation (6038068) was created on March 9th for the entire landmass of Great Britain. I haven't linked directly to it here because most tools seem to be unable to display it due to its size.

The relation has the place=island tag, which is probably causing the behaviour you see. You can report this to Lambertus here and he may be able to make changes to his style to better accommodate place=island.

permanent link

answered 06 Apr '16, 19:27

alester's gravatar image

alester
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accept rate: 28%

1

You could argue that it's full of errors because it's been created as a multipolygon with no inners :)

The creating changeset, for info, is this one:

https://www.openstreetmap.org/changeset/37713755

(you can link to that without problems). Currently the latest version of it is 6 and you can use something like:

wget http://openstreetmap.org/api/0.6/relation/6038068/6

to retrieve the XML of it.

http://osm.mapki.com/history/relation.php?id=6038068

currently also works, provided that your browser supports large tables.

(06 Apr '16, 20:20) SomeoneElse ♦
(21 Aug '16, 09:11) SomeoneElse ♦
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question asked: 05 Apr '16, 22:28

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last updated: 21 Aug '16, 09:11

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