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I found on the map near Mazin, Croatia a polygon with no tags but "source = landsat". Is it rubbish or what does it stand for?

asked 14 Oct '14, 18:16

Reinhard%20Tisma's gravatar image

Reinhard Tisma
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accept rate: 0%


I presume that you mean this one:

http://www.openstreetmap.org/way/77629035

It's actually part of a "multipolygon" - a piece of forest shaped like a doughnut:

http://www.openstreetmap.org/relation/1369031

That has the relevant tags on it, including "landuse=forest".

It's perfectly OK to have the multipolygon tags on the relation, as it enables a mapper to have different tags on the constituent ways (for example, when mapping a forest I might have been able to do some parts from survey and the rest only from aerial imagery, and might want to use different "source" tags), while keeping the tags that apply to the relation as a whole on the relation.

A word of warning - the outer way of this forest has a very large number of nodes, so if you try and use Potlatch 2's** internal history viewer your browser may struggle. Also, you'll notice in Potlatch 2 that it doesn't render the forest as a forest (because the main tag's on the relation) - unfortunately this is normal.

** I'm guessing that you're using that editor based on a similarly named mapper's previous edits; apologies if I've got the wrong person.

permanent link

answered 14 Oct '14, 18:50

SomeoneElse's gravatar image

SomeoneElse ♦
36.9k71370866
accept rate: 16%

edited 14 Oct '14, 19:02

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question asked: 14 Oct '14, 18:16

question was seen: 1,804 times

last updated: 14 Oct '14, 19:02

NOTICE: help.openstreetmap.org is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum