Road Network Improvements in Czech Republic

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

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

Hi, I think using this mailing list is the most appropriate channel for reaching out to the Czech community. I am a bit worried about the source of the imagery you will be using. Czech Republic is in quite diverse terrain so imagery is sometimes very off. I believe most of the roads are already mapped and already aligned using czech cadastral maps (cuzk:km) so I would suggest to use that layer for reference too to avoid making things worse: https://wiki.openstreetmap.org/w/index.php?title=Tag:source%3Dcuzk:km&redirect=no I would be also interested in more detail on improvements for cities. What does it mean? Changes to landuse areas? city points? Something else? We also have many waterways and highway networks imported so they still often intersect without the correct bridge/tunnel. What methods are you going to use to distinguish these? Just publicly available satellite imagery? Or you will just bridge everywhere? Regards, Jakub On Wed, Mar 3, 2021 at 12:47 PM Murad Vardzelyan via talk-cz

Hi, I think using this mailing list is the most appropriate channel for reaching out to the Czech community. I am a bit worried about the source of the imagery you will be using. Czech Republic is in quite diverse terrain so imagery is sometimes very off. I believe most of the roads are already mapped and already aligned using czech cadastral maps (cuzk:km) so I would suggest to use that layer for reference too to avoid making things worse: https://wiki.openstreetmap.org/w/index.php?title=Tag:source%3Dcuzk:km&redirect=no I would be also interested in more detail on improvements for cities. What does it mean? Changes to landuse areas? city points? Something else? We also have many waterways and highway networks imported so they still often intersect without the correct bridge/tunnel. What methods are you going to use to distinguish these? Just publicly available satellite imagery? Or you will just bridge everywhere? Regards, Jakub On Wed, Mar 3, 2021 at 12:47 PM Murad Vardzelyan via talk-cz <talk-cz na openstreetmap.org> wrote:

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

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 Jakub, Thanks for your reply. We use GPS traces (private and non-downloadable) generated by our drivers to improve the road network. You can find the details here: https://wiki.openstreetmap.org/wiki/Organised_Editing/Activites/Bolt Organised_Editing/Activites/Bolt <https://wiki.openstreetmap.org/wiki/Organised_Editing/Activites/Bolt>.Improvements include missing roads, one-way tags, road access, turn restrictions etc. Since we operate in the Czech Republic, we reach to the local Bolt team when there's a doubt, and they provide ground data in such cases. We would use czech cadastral maps (cuzk:km) as you suggested. Please let us know if you have any other questions. Regards, Murad

Hi Jakub, Thanks for your reply. We use GPS traces (private and non-downloadable) generated by our drivers to improve the road network. You can find the details here: https://wiki.openstreetmap.org/wiki/Organised_Editing/Activites/Bolt Organised_Editing/Activites/Bolt <https://wiki.openstreetmap.org/wiki/Organised_Editing/Activites/Bolt>. Improvements include missing roads, one-way tags, road access, turn restrictions etc. Since we operate in the Czech Republic, we reach to the local Bolt team when there's a doubt, and they provide ground data in such cases. We would use czech cadastral maps (cuzk:km) as you suggested. Please let us know if you have any other questions. Regards, Murad On Wed, Mar 3, 2021 at 4:14 PM Jakub Jelen <jakuje na gmail.com> wrote: