Changeset: 148738302
Made with help of Aerial Imagery
Closed by aviation0178
Tags
changesets_count | 5 |
---|---|
created_by | iD 2.28.1 |
host | https://www.openstreetmap.org/edit |
imagery_used | Orthophoto (2016–2018), 1:5000, Latvia |
locale | en-US |
source | aerial imagery |
Discussion
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Comment from HellMap
Hi!
Thanks for your additions!
Just to let you know, it's not really necessary to include a `source` tag on every element. This makes data more difficult to maintain because everyone later has to update this tag when they make any changes. It's also redundant, because we can see element modification history and your changeset tags (i.e. on https://www.openstreetmap.org/changeset/148738302 ), such as `imagery_used` and whatever you specified as `source`. So it's usually enough to just specify that.
Most `source` tags that are included in OSM are for obscure or unclear sources, such as imported data or hard-to-understand elements. While you can technically add them for anything, they will become outdated really quickly. For example, new aerial imagery or someone else surveying or just your GPX track not being public. Most mappers won't even notice the tag. Experience shows that there aren't enough mappers (at least in Latvia) to keep these up to date and the vast majority of `source` values are out of date. It's much more useful to leave a descriptive changeset summary, such as how and why you are modifying something.
Thanks
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Comment from aviation0178
@HellMap Thank you for correcting me! I am still new to this, but I am trying my best here.
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Comment from HellMap
No worries, let me know if you have any questions. Your edits look good otherwise.
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Comment from aviation0178
I recently (not in this edit) added a cut-down area. Is it made correctly? Do I need to specify a relation ID, or I can't see it because it isn't just published yet?
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Comment from HellMap
The map takes a little bit of time to update. Sometimes a few minutes, sometimes longer. You will probably also need a browser cache clear.
https://wiki.openstreetmap.org/wiki/Browser_cache
Clearcuts won't appear on the default map unless you combine it into a multipolygon with the forest, so that it's a "hole" in the forest. The reason is that there is no rendering on the default map for clearcuts, so these overlapping features just look like a forest. Other maps and programs may display it differently. A "hole" in the forest will simply not draw the forest there and leave it default white, so it becomes visible, so to speak.
Strictly speaking, you can't have both a forest and a clearcut at the same time. So these should normally be combined into multipolygons or drawn next to each other.
Multipolygons are a bit complicated. But you can select both areas (forest and clearcut) and press C to combine them. If the forest isn't a multipolygon yet, it will make one. If the forest is large and already has other parts outside the screen, you will have to download them first by selecting the forest relation and downloading its members. You can also manually add the cutline to the multipolygon relation without downloading other elements, but it's more annoying than just shift-selecting and C-ing them.
https://wiki.openstreetmap.org/wiki/Relation:multipolygon#iD
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Comment from aviation0178
Big thank you!
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Comment from richlv
Also very much welcome to discuss things in the Latvian OSM community chat - https://osmlatvija.zulipchat.com :)
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Comment from gileri
Hi, thank you @aviation0178 for contributing to OSM, and @Hellmap for your welcoming messages !
Just a quick note: while putting source=* tags on objects is not often useful or encouraged for the reasons HellMap put forward, using it on changesets is definitely useful and encouraged.
It allows other mappers to understand where does the change come from, especially in recently physically changed areas, where things may be visible in some sources but not others yet.
But more importantly, indicating the source of changes is a requirement of most aerial imageries. And a small token of appreciation of their work ;)
This source=* tag can be set just before sending changes from the iD editor you use, below the changeset message.
Ways (20)
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- 1263246637, v1
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- 388724852, v4
- 794457751, v3
- Kāpostnieka masīva ceļš (997762378), v3
- Zarukalni-Rūsiņi (997762397), v6
- 162 (1238532826), v2
- 1263238142, v2
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