It's from Sentinel-2 imagery like it says. Although the resolution is not high enough to be 100% sure, i suspect that around the village you mention the road was straightened recently, Sentinel-2 is usually up to half a year old for the most recent usable imagery.

I think in this particular case it follows from the route continuity that it must be G209 but if there is an explicit source that would be better

I think I just searched Wikipedia or Baidu results for which major road passes through that area. Some of it was already traced roughly by others

osm.wiki/User:Ff5722/Using_Sentinel-2_imagery

source should be DigitalGlobe Premium

I have simplified the ways in JOSM with a 15 m threshold, and merged or deleted all ways with less than 17 nodes. Some abberations redrawn from Bing. It should be a lot better now. Later i'll refine it from imagery more.

See my documentation here: osm.wiki/User:Ff5722/USGS_treecover_data

I would say it is more comparable to using Scanaerial.

Admittedly the data from this area is not that good, but as i trace around this area manually often, I also expected to refine it soon by hand.

They are derived from usgs data, I added everything in manually checked chunks with background imagery enabled. Some places need more refinement, but 'no resemblance at all' seems exaggerated.

It was discussed in talk-cn.

gefixt

I accidentally reverted changeset #48561075 in the same layer, the rest of it is all around 武强县.

http://overpass-api.de/achavi/?changeset=49114478

Well there's a first for everything...

I have to believe you on this :)

osm.org/way/335031789 has the tag 'abbatoir=cat'

except for the fact that the key abbatoir is only used here, I don't think this business is really a slaughterhouse for cats.

我已经修了😇
osm.org/changeset/47331576

请不用简称象‘BLVD’
osm.wiki/Names#Abbreviation_.28don.27t_do_it.29

Hi, it's better to connect the bride to the road, so it can be used for pedestrian routing.

example: osm.org/directions?engine=graphhopper_foot&route=36.06114%2C103.80308%3B36.06125%2C103.80358#map=19/36.06123/103.80340

osm.org/way/392414054

Why have you added this bridge as completed and accessible if it is nowhere close to completion even one year later? It will confuse people trying to use OSM data for routing.

道路真的只叫‘南’？

That should be highway=tertiary
I sometimes make typos and JOSM keeps suggesting those until restart. I will correct it asap.

嗯 可以，我会清它