Changeset: 74457805
Task 1171 validation #hotosm-project-6650 #2019BoliviaFires #Bolivia -
Closed by Greg_Rose
Tags
changesets_count | 3241 |
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created_by | iD 2.15.5 |
hashtags | #hotosm-project-6650;#2019BoliviaFires;#Bolivia |
host | https://www.openstreetmap.org/edit |
imagery_used | Custom (https://earthwatch.digitalglobe.com/earthservice/tmsaccess/tms/1.0.0/DigitalGlobe:ImageryTileService@EPSG:3857@jpg/{z}/{x}/{-y}.jpg?connectId=91e57457-aa2d-41ad-a42b-3b63a123f54a);OpenStreetMap GPS traces;.gpx data file;Bing aerial imagery |
locale | en-US |
Discussion
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Comment from Frans S
Hi Greg. You've been very buzzy I see.
About Waterways and ponds/ water areas.
you often stop with mapping a river/stream on the edge of a area of water. like here.
When you connect the node of a river/stream to a node of that area, it gives an error. When it is a continuing stream please map them through the water area without letting nodes connect to each other. I've seen that as well with Highways ending on a residential area node.
Please keep that in mind at future mappings. ( you are working in JOSM, Why don't you check your work with the validation tool)
Best regards and keep mapping -
Comment from Greg_Rose
So... first off, I've had mappers tell me the exact opposite too, just so you know. ;)
And based on feedback in the forums, I now connect most waterways to the water bodies they pass through.
Notice that JOSM does not actually give an "error" in the validation tool - it's simply the warning triangle on the map itself. I understand that those triangles are more a warning than an error - the intersection of area and way needs to be investigated to make sure it's valid. i.e. - two landuse areas can intersect (and always should) but a landuse should never intersect a natural feature or highway.
Another exqample that I've had to map in Bolivia: Seasonal highways that go through an intermittent lake MUST intersect the lake edges, and the portion in the lake needs to be split and tagged with "ford". JOSM will show the warning triangles, but shouldn't show an error. -
Comment from Greg_Rose
Another point from a disaster response perspective: connecting a waterway to a water body allows flood alerts from one feature to cascade to the other. Example: flood alert for Lake A will easily create flood warnings for downstream waterways B, C & D, because they all intersect. If the waterways simply pass through without intersecting, it's much more difficult to accomplish.
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Comment from Greg_Rose
I actually can't find the forum post that led me to start connecting waterways to lakes they feed. Do you have a link to anything that says to NOT do that? I looked at various places around Europe and found a mixture of both options being mapped.
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Comment from Frans S
Hi Greg
I try to follow this wikihttps://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver
It shows also that a waterway should not stop on a riverbank etc. ( see text)
The same with riverbanks. When I map them the river is mapped through it. You can with a bit of imagination also say that in your case a series of water (small lakes) are just water containing parts of the riverbank and the river should be tagged as intermittent=yes.
Leave me a reaction if you want.
Best regards -
Comment from Greg_Rose
Hold on - If you're talking about ending a waterway on a water body, and then restarting again on the other side - yes, that is an error, and I take full responsibility for doing that. That usually happens when there are multiple inflows into a waterbody and I haven't figured out which one (if any) continues.
But if you're talking about connecting a waterway node to a water-body node, that wiki page says nothing about that, and neither do https://wiki.openstreetmap.org/wiki/Rivers or https://wiki.openstreetmap.org/wiki/Tag:natural%3Dwater.
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