Some countries in Africa have their own tagging Standards
https://wiki.openstreetmap.org/wiki/Namibian_Tagging_Standards
https://wiki.openstreetmap.org/wiki/South_African_Tagging_Guidelines
I think we should encourage all local communities to develop their own
guidelines
For national road reference systems we would either need odbl
compatible open data or help from people with local knowledge.
Hot related projects are following (they try to) most of the time the
https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa guidelines
Ralf
On 07.04.19 19:11, Walker Kosmidou-Bradley wrote:
Dear Kevin,
In many countries, the country designations are mapped to the OSM
conventions and then the Main, District, or Local to which you allude
could be a part of the ref/number. Afghanistan has a pretty simple
process to go from from OSM to national data
(https://wiki.openstreetmap.org/wiki/Highway_Tag_Afghanistan) please
note that this highway tag list was adapted from the fine work done
for https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa.
In Afghanistan, the government knows that OSM secondary roads are
“district roads” and the ref number reflects that, e.g. D320781
(Secondary) and NH1010 (Trunk), Afghanistan doesn’t use the motorway
designation from OSM. If they need to change the tag after
downloading, a simple if/than script can make the adjustment in a
couple minutes.
I’m happy to learn more how other folks have tackled this issue.
Best,
Walker
On Apr 7, 2019, at 21:30, Kevin McPherson via HOT
<[email protected] <mailto:[email protected]>> wrote:
[External]
Dear all, I am new to this HOT interface on OSM, but joined last
week, and interested in road classification in OSM. This is my first
posting, and first time I have engaged with anyone on OSM, so am
still getting up to speed.
"Road Classification" is an important topic for roads agencies, it
helps define the funding and prioritisation for development and
maintenance of the road network in a country.
With regards to OSM, one issue is that the <highway> tag in OSM is
never quite the same as the official definition of the country. For
example, the highway tag:
https://wiki.openstreetmap.org/wiki/Key:highway
uses "Motorway", "Trunk", "Primary", "Secondary" etc. while a
national roads agency might use other terminology such as "Main",
"District", "Local" etc.
What this means is that the road network classification in OSM is
never quite the same as that used by the Roads Agency, and there are
discrepancies between the "official" data of the roads agency, and
the OSM definition. This causes confusion to anyone who wants
accurate mapping.
As part of my work, I am trying to encourage Roads Agencies to review
OSM mapping, to compare with their official definitions, and to
update OSM based on their own records. However, the differences in
the classification terminologies are a barrier to this. Every country
potentially has a different classification system. We have been
discussing internally that an extra "layer" on top of OSM might be a
way forward, but that is an overhead and requires extra cost and
administration.
Would be grateful for anyone's views on this.
Regards, Kevin McPherson
On Saturday, April 6, 2019, 3:34:19 PM GMT+1, Ralf Bernhardt
<[email protected] <mailto:[email protected]>> wrote:
My point this time is not the classification of a few roads. What I
learn from this, is that our data is processed and reviewed again. If
a mapping error is detected by local staff, it will most likely only
be reported to their own mapping department. It will also only be
fixed locally. We as mappers or validators will never learn from this
process. All errors will remain in the OSM Database. That might be
understandable in an emergency situation like now. But without
direct feedback from map users we will never improve. We should also
demand that more local knowledge will be shared with OSM. A simple
thank you is not enough.
Ralf
On 06.04.19 13:29, John Whelan wrote:
There is another wiki guide
https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa
both get updated from time to time. As a general rule of thumb I tag
highways between settlements as unclassified not track, I leave it to
the local mappers to say if it is a higher classification.
Occasionally I'll tag as high as tertiary. Normally I leave the tags
alone but have been known to retag motorways between two small
settlements as unclassified.
I think step one is to get something mapped. Step two is correct it
and with lots of new mappers with different ideas we'll always see
some problems.
Cheerio John
Frans Schutz wrote on 2019-04-06 6:27 AM:
Hello Ralf
you pinpoint to a situation which is not always clear.
First of all. we ty to keep ourselves to the East African Highway
tagging wiki
https://wiki.openstreetmap.org/wiki/East_Africa_Tagging_Guidelines
Different mappers judge different how to tag a highway. Out of my
own experience lots of mappers (and validators) struggle with how to
tag a highway. Looking to the importance, the routing, and the
width of the highway, which is hard to measure from a satellite
image, we have to decide. A big number of new mappers are joining us
and have different ideas (nor no idea at all) how to tag a highway.
I've seen taggings as secondary highway as a connection to 2 hamlets
and so on. So we try to tag as good as possible, but often it is a
(calculated)guess which tag is relevant. Take also in account that
there is a huge time pressure on these disaster mapping projects, so
sometimes you accept the tagging as they were made. When there is no
time pressure you can take a look to each highway and decide.
I hope you get an understanding how we have to deal with this subject.
Best regards
Frans Schutz
Validator
Op 5-4-2019 om 20:10 schreef Ralf Bernhardt:
Interesting when compared to the openstreetmap data.
There are many POIs I would like to see on Openstreetmap too, also
boundarys and place names.
I also noticed a different tagging scheme: Car, Moto and Foot. I would
guess that Roads not passable for a car but by foot and moto should be
highway=path in OSM.
But most of them are still tagged as unclassified or residential. Is
there a reason for that or will you change them later?
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