[Talk-is] OSM Iceland road network data analysis

[Svavar Kjarrval]

Hæ!

One possible reason for the difference could be that Vegagerðin's file
only includes the road segments they deem themselves responsible for. If
the road itself continues and under the same name, it could affect the
results. Sometimes we don't have any information to indicate a name
change or we didn't have a reason to suspect a different name when
extending the wayline. Some unknowing users could also have extended the
road number assignment to other parts of the way, thinking that it was
omitted by accident. The possibilities are numerous.

However, there is some other data from Vegagerðin which could be used to
enhance the road system. It's located at
https://osm.is/gogn/Vegager%C3%B0in/ . It's from a few years ago but I
could send a request for more recent data. If I remember correctly, the
licence wasn't clear or they didn't state one.

-Svavar Kjarrval

On mán 19.des 2016 08:16, michael.hofer50 at a1.net wrote:
> Komið þið sæl og blessuð.
>  
> My Icelandic language skills are not good enough to write a letter so
> I’m writing my message in English.
>  
> I did in the last time a road network analysis on OSM Iceland data.
> Here I checked with the road list from vegagerdin
> http://www.vegagerdin.is/vefur2.nsf/Files/Vegaskra_2015/$file/Vegaskra_2015.xlsx
> , if the roads and segments of roads are mapped correspondingly to the
> list.
>  
> As mapping basis I took the information from the OSM Iceland Wiki.
> Unfortunately this wiki wasn’t actualised in the last years, probably
> because it’s an awful manual work. I don´t know if there exist a plug
> in to actualise the road list in the wiki with a set of
> Overpass-queries. The information there is included in OSM, but not
> extracted and processed to the wiki yet.
>  
> In the road list from vegagerdin exist a new road network type "Sx".
> The Kjalvegur for example has this network type. I understand it as
> primary highland route, but left the mapped road as it was.
>  
> I focused on the 1 to 3 digits road reference numbers, the four digit
> roads I only looked at, when I strolled over it. When I found
> information about the road, mostly in OSM I tried to fix it immediately.
>  
> A few roads I found which I couldn’t identify in OSM. The road might
> exist with a different name and without the mapped reference number.
> As I can’t state a fixme statement on elements which I didn’t find, I
> list the roads here:
> 378 01  Skíðaskálavegur Hringvegur (1-d8), við Skíðaskála Hringvegur
> (1-d8)
> 413 03  Breiðholtsbraut Reykjanesbraut            Hafnarfjarðarvegur (40)
> 419 01  Höfðabakki  Reykjanesbraut              Nesbraut (49)
> 419 02  Höfðabakki  Nesbraut                Hallsvegur (432)
> 470 01  Fjarðarbraut  Hafnarfjarðarvegur          Hafnarfjörður,
> Lækjargata
> 470 02  Fjarðarbraut  Ástorg                Hafnarsvæði
> 470 02  Fjarðarbraut  Hafnarfjörður, Lækjargata     Hafnarfjörður,
> Hvaleyrarbraut
> 628 01  Hjarðardalsvegur  Vestfjarðavegur (60-43)     Hjarðardalur
> 713 01  Hvítserksvegur  Vatnsnesvegur (711-05)  711-05    Hvítserkur,
> bílastæði
> 757 01  Villinganesvegur  Skagafjarðarvegur (752-03)    Villinganes
> 830 02  Svalbarðseyrarvegur Hringvegur (1-q2)       Svalbarðseyri,
> Laugartún
> 845 02  Aðaldalsvegur Staðarbraut (854-01)        Norðausturvegur (85-03)
> 846 01  Austurhlíðarvegur Hringvegur (1-q8)       Stóru-Laugar
> 859 01  Hafnarvegur Húsavík Norðausturvegur (85-05)     Hafnarsvæði,
> endi gangbrautar
> 865 01  Gilsbakkavegur  Norðausturvegur (85-12)       Gilhagi 1
> 897 01  Svalbarðstunguvegur Norðausturvegur (85-24)     Fjallalækjarsel
> 942 01  Steinsvaðsvegur Borgarfjarðarvegur (94-04)      Stóra-Steinsvað
> 942 02  Tjarnarlandsvegur Steinsvaðsvegur (942-01)    Tjarnarland
> 948 01  Gilsárteigsvegur  Borgarfjarðarvegur (94-03)    Gilsárteigur 1
> 949 01  Þrándarstaðavegur Borgarfjarðarvegur (94-01)    Þrep
> 2284  01  Sólheimahjáleiguvegur Mýrdalsjökulsvegur (222-01)  
> Sólheimahjáleiga
> 2285  01  Ytri-Sólheimavegur  Mýrdalsjökulsvegur (222-01)    
> Ytri-Sólheimar 3
> 2286  01  Ytri-Sólheimavegur 1  Mýrdalsjökulsvegur (222-02)  
> Ytri-Sólheimar 1
> 7079  01  Núpsdalstunguvegur  Arnarvatnsvegur (578-05)      Núpsdalstunga
>  
> The following roads mapped in OSM I couldn´t find in the road list
> from vegagerdin or the mapped road don’t correspond with the
> information in the vegagerdin road list:
> 882 01  Leyningshólavegur Villingadalsvegur (8370-01)   Leyningshólar
> 915   Vesturárdalsvegur
> 2001  01
>  
> There are lots of roads in the list, where I couldn’t find the places
> from the list, especially when the road leads to a farm or house.
>  
> The list also gives the road length, where the length is measured over
> ground I guess. OSM has no elevation in the map so the measured road
> length is as the ground would be flat. The difference between these
> values should be under 10%. Unfortunately the difference on lots of
> the roads is much higher (up to 50%).
> One reason for this could be that the road with certain reference
> number is much further mapped as vegagerdin states it. But on some
> roads also the mapping quality might be poor. But also on these I
> didn’t focus. I might try to improve the map in future when there is
> some time for it.
>  
> Also I realised that outside Reykjavík in the villages most of the
> schools aren’t mapped.  The schools are used in summer as guesthouse,
> so only the tourist infrastructure is mapped. Is this still correct?
> How to map this in OSM?
>  
> I hope that the Icelandic community have a look on some of the items.
>  
>  
> Gleðileg jól og farsælt komandi ár
>  
>  
> Michal Hofer
>
>
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