[talk-cz] Road Network Improvements in Czech Republic

[Jan Martinec]

Hello and welcome to talk-cz!

This is indeed a major hub of Czech OSM activity - questions? Ask; even 
though we mostly use Czech language, many of us can use English. As an 
OSM contributor, IMHO the more data the better. I have read your process 
flow, let me comment on it. (Shrnu poznámky k procesu na 
https://wiki.openstreetmap.org/wiki/Bolt v češtině, po odstavcích.)

- Adding missing roads
This is going to be rare in populated areas; you might find some outside 
of cities, mostly highway=unclassified-ish, limited access service 
roads, or unpaved links. Most missing roads added are from actual OTG 
new construction. (Málokde už se najde veřejná chybějící silnice.)

- Adjusting road alignment as per imagery and GPS traces
Road gardening is a fairly popular pastime. As far as imagery goes, 
cross-reference carefully with GNSS and existing data - some sources are 
wildly offset. Good news, though: useful license-compatible hi-res 
imagery is available e.g. for Prague; check 
https://wiki.openstreetmap.org/wiki/Cs:%C4%8Cesko/freemap for a list 
(page is in Czech, but should be fairly understandable from machine 
translation). Note that many roads are included in public transport 
relations; editing in JOSM will mostly take care of preserving them, 
though. (Zpřesňování silnic dobrý, pozor na rozhozený podklady, máme 
lokální ortofoto.)

- Validate existing tags like- classification - Residential, Trunk, 
Motorway etc and attributes - Bridge, Tunnel, links etc.
Check 
https://wiki.openstreetmap.org/wiki/Highway:International_equivalence 
for a rough guide, e.g. motorroads are mapped fully IIRC.
As for bridges: try to also record the limits, e.g. maxweight for the 
way over the bridge and maxheight for ways passing underneath (most are 
unsigned OTG, i.e. =default); bridge:structure would be a nice extra, 
although most road bridges are of the =beam variety.
Small streams crossing under a road are mostly mapped using 
tunnel=culvert, only when the crossing is an actual bridge (has a 
white-on-black sign with a ref number) would it make sense to use 
bridge=yes.
Other data, such as lanes, turn lanes, maxspeeds (especially where 
posted explicitly), destinations, and similar tags would be more than 
welcome. (Členění silnic viz link, co mapovat u mostů, propustky; co 
obvykle chybí u silnic za tagy)

Some places might be missing street names - don't sweat it too hard, 
smaller villages do not necessarily have them; in cities, a 
highway=residential missing a name is rare.
Address points are imported on an automated basis from the official 
source - note the complex tagging system (historical OTG purposes). 
Again, an unresolvable address should be rare - but there are also 
opposite cases, with multiple valid address points resolvable from a 
valid input (e.g. "Koněvova 159, Praha" is Koněvova 159/12 or Koněvova 
2417/159: same street, few km apart)
https://wiki.openstreetmap.org/wiki/Address_import_from_RUIAN
(Názvy ulic, adresní body, nejednoznačné adresy)

- Cities might be revisited on the basis of new improvements and/or 
internal requirements.
The task is indeed never complete, mistakes happen, and so on. I look 
forward to more mappers improving the map.
Good luck :)
(Pořád je co dělat, mapování zdar)

Jan "Piskvor" Martinec

On 03. 03. 21 9:49, Murad Vardzelyan via talk-cz wrote:
> Hi there,
> 
> I’m Murad from Bolt.
> 
> We are going to start improving the road network in the Czech Republic. 
> Project details can be found here: 
> https://wiki.openstreetmap.org/wiki/Organised_Editing/Activites/Bolt. We 
> would like to get familiar with local mapping guidelines if there are any.
> 
> Please, also, let me know if you have preferred contact 
> channels other than this talk-list.
> 
> Waiting for your reply.
> 
> Regards, Murad from Bolt Map Production
> 
> 
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