Re: [HOT] HOT Connecting it all up

[john whelan]

I think it is much more basic than that.  We seem to have a number of
isolated islands of mapping that have highways but the islands are not
connected.

The islands often seem square in shape and normally quite well mapped but
they do not have connections to other parts of the map.  I suspect they are
from HOT mappers.

Cheerio John

On 3 Nov 2017 1:28 pm, "Ralf Bernhardt"  wrote:

> This might be interesting:
> https://forum.openstreetmap.org/viewtopic.php?id=59957
> A. Brensch has checked the major road network for Germany and other
> countries.
> Please test some of the links and see how difficult (impossible) it gets,
> towards the end, to fix this problems without local knowledge. Keepright is
> also always a good address for identifying routing related errors. For
> suspicious turn restrictions try this page:
> https://ahorn.lima-city.de/tr/
> You can adjust the preferences by clicking on the gear symbol.
> Along the Cape Town to Kenya route two barriers need to be removed
> https://www.openstreetmap.org/changeset/17544737?node_page=3
> 4#map=7/-13.144/38.386
> https://www.openstreetmap.org/changeset/25700883
> And by the way, to watch the Impact of HOT projects on OSM routing
> capabilities is always pure horror.
>
>
> ___
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Re: [HOT] Connecting it all up

[Andrew Buck]

A more systematic way yet would be to make a map where you pick a grid
of points, say 1 every mile, and then calculate a route from each point
to a spot 10 miles east and 10 miles north of that starting point and
then sum the distances and store that sum as the value for that point.
Anywhere you get points with values much over 20 miles will be places
with routing gaps.  Some will be natural like rivers, but many will be
gaps in our data.

I think there was some work done like this when people were connecting
up tiger data along US county lines.  But I don't remember who did it or
where it was.

I don't have the tech skills to code this up, but in theory it is not
all that tricky.  If someone did make such a map, it would be
interesting to see the result.

-AndrewBuck


On 11/03/2017 07:51 AM, Joseph Reeves wrote:
> Hi John,
> 
> I like things like this; I'm not sure if I've got anything useful for you,
> but happy to talk about it. I think that routing would be a good place to
> start testing.
> 
> For example, in 2009 OSM reported that it was a 7298 km drive from Cape
> Town to the Kenya / Ehtiopia border. In 2010 this was reduced to  km:
> http://blogs.thehumanjourney.net/finds/entry/route_finding_across_a_continent
> 
> Now it comes back as 6051 km:
> http://www.openstreetmap.org/directions?engine=graphhopper_car=-33.9157%2C18.4257%3B3.5190%2C39.0547#map=4/-22.55/19.42
> 
> 
> According to OSM, the driving distance is roughly 17% less today than in
> 2009; I would imagine that the reduction in distance represents both the
> building of new physical infrastructure and an improvement in OSM data.
> 
> Routing is a really easy way to look for problems in OSM, such as:
> https://twitter.com/iknowjoseph/status/567719622070525953
> 
> So if you're interested in specific areas, I would suggest creating a route
> and looking to improve mapping along it.
> 
> Long term, we could think of ways to conduct this analysis more
> systemically. I would like to experiment with something along the lines of:
> 
> 
>1. Daily dump of OSM's Africa data
>2. Create 100 start points and 100 end points
>3. Daily create routes from each start to each end point
>4. Log / graph distance of each route
>5. Display each route on a map, coloured by change in daily route
>distance
> 
> 
> Does anyone have a spare server? :)
> 
> Cheers, Joseph
> 
> 
> 
> On 2 November 2017 at 21:27, john whelan  wrote:
> 
>> If you look at many parts of the map in Africa you can see squares of
>> activity.  Often HOT projects but there are many many places where a
>> tertiary or higher classified highway is fifty meters or less from
>> connecting to another highway.
>>
>> I seem to recall in Ghana they had a project to just map the major
>> highways.  This is pure infrastructure, it isn't exciting like mapping
>> buildings but I suspect it would make the map a lot more usable if we could
>> connect up a few more highways and I'm not even sure how you could detect
>> them.
>>
>> Thoughts?
>>
>> Thanks John
>>
>> ___
>> HOT mailing list
>> HOT@openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/hot
>>
>>
> 
> 
> 
> ___
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> https://lists.openstreetmap.org/listinfo/hot
> 




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Re: [HOT] HOT Connecting it all up

[Ralf Bernhardt]

This might be interesting:
https://forum.openstreetmap.org/viewtopic.php?id=59957
A. Brensch has checked the major road network for Germany and other 
countries.
Please test some of the links and see how difficult (impossible) it 
gets, towards the end, to fix this problems without local knowledge. 
Keepright is also always a good address for identifying routing related 
errors. For suspicious turn restrictions try this page:

https://ahorn.lima-city.de/tr/
You can adjust the preferences by clicking on the gear symbol.
Along the Cape Town to Kenya route two barriers need to be removed
https://www.openstreetmap.org/changeset/17544737?node_page=34#map=7/-13.144/38.386 


https://www.openstreetmap.org/changeset/25700883
And by the way, to watch the Impact of HOT projects on OSM routing 
capabilities is always pure horror.



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Re: [HOT] Connecting it all up

[Joseph Reeves]

And then, with some serendipity, I saw this:

https://twitter.com/tjukanov/status/924625046248787968
https://medium.com/@tjukanov/animated-routes-with-qgis-9377c1f16021

Which is not as I was proposing, but similar,

Cheers, Joseph



On 3 November 2017 at 12:51, Joseph Reeves  wrote:

> Hi John,
>
> I like things like this; I'm not sure if I've got anything useful for you,
> but happy to talk about it. I think that routing would be a good place to
> start testing.
>
> For example, in 2009 OSM reported that it was a 7298 km drive from Cape
> Town to the Kenya / Ehtiopia border. In 2010 this was reduced to  km:
> http://blogs.thehumanjourney.net/finds/entry/route_finding_across_a_
> continent
>
> Now it comes back as 6051 km: http://www.openstreetmap.org/
> directions?engine=graphhopper_car=-33.9157%2C18.4257%
> 3B3.5190%2C39.0547#map=4/-22.55/19.42
>
> According to OSM, the driving distance is roughly 17% less today than in
> 2009; I would imagine that the reduction in distance represents both the
> building of new physical infrastructure and an improvement in OSM data.
>
> Routing is a really easy way to look for problems in OSM, such as:
> https://twitter.com/iknowjoseph/status/567719622070525953
>
> So if you're interested in specific areas, I would suggest creating a
> route and looking to improve mapping along it.
>
> Long term, we could think of ways to conduct this analysis more
> systemically. I would like to experiment with something along the lines of:
>
>
>1. Daily dump of OSM's Africa data
>2. Create 100 start points and 100 end points
>3. Daily create routes from each start to each end point
>4. Log / graph distance of each route
>5. Display each route on a map, coloured by change in daily route
>distance
>
>
> Does anyone have a spare server? :)
>
> Cheers, Joseph
>
>
>
> On 2 November 2017 at 21:27, john whelan  wrote:
>
>> If you look at many parts of the map in Africa you can see squares of
>> activity.  Often HOT projects but there are many many places where a
>> tertiary or higher classified highway is fifty meters or less from
>> connecting to another highway.
>>
>> I seem to recall in Ghana they had a project to just map the major
>> highways.  This is pure infrastructure, it isn't exciting like mapping
>> buildings but I suspect it would make the map a lot more usable if we could
>> connect up a few more highways and I'm not even sure how you could detect
>> them.
>>
>> Thoughts?
>>
>> Thanks John
>>
>> ___
>> HOT mailing list
>> HOT@openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/hot
>>
>>
>
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Re: [HOT] Connecting it all up

[Joseph Reeves]

Hi John,

I like things like this; I'm not sure if I've got anything useful for you,
but happy to talk about it. I think that routing would be a good place to
start testing.

For example, in 2009 OSM reported that it was a 7298 km drive from Cape
Town to the Kenya / Ehtiopia border. In 2010 this was reduced to  km:
http://blogs.thehumanjourney.net/finds/entry/route_finding_across_a_continent

Now it comes back as 6051 km:
http://www.openstreetmap.org/directions?engine=graphhopper_car=-33.9157%2C18.4257%3B3.5190%2C39.0547#map=4/-22.55/19.42


According to OSM, the driving distance is roughly 17% less today than in
2009; I would imagine that the reduction in distance represents both the
building of new physical infrastructure and an improvement in OSM data.

Routing is a really easy way to look for problems in OSM, such as:
https://twitter.com/iknowjoseph/status/567719622070525953

So if you're interested in specific areas, I would suggest creating a route
and looking to improve mapping along it.

Long term, we could think of ways to conduct this analysis more
systemically. I would like to experiment with something along the lines of:


   1. Daily dump of OSM's Africa data
   2. Create 100 start points and 100 end points
   3. Daily create routes from each start to each end point
   4. Log / graph distance of each route
   5. Display each route on a map, coloured by change in daily route
   distance


Does anyone have a spare server? :)

Cheers, Joseph



On 2 November 2017 at 21:27, john whelan  wrote:

> If you look at many parts of the map in Africa you can see squares of
> activity.  Often HOT projects but there are many many places where a
> tertiary or higher classified highway is fifty meters or less from
> connecting to another highway.
>
> I seem to recall in Ghana they had a project to just map the major
> highways.  This is pure infrastructure, it isn't exciting like mapping
> buildings but I suspect it would make the map a lot more usable if we could
> connect up a few more highways and I'm not even sure how you could detect
> them.
>
> Thoughts?
>
> Thanks John
>
> ___
> HOT mailing list
> HOT@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/hot
>
>
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[HOT] Connecting it all up

[john whelan]

If you look at many parts of the map in Africa you can see squares of
activity.  Often HOT projects but there are many many places where a
tertiary or higher classified highway is fifty meters or less from
connecting to another highway.

I seem to recall in Ghana they had a project to just map the major
highways.  This is pure infrastructure, it isn't exciting like mapping
buildings but I suspect it would make the map a lot more usable if we could
connect up a few more highways and I'm not even sure how you could detect
them.

Thoughts?

Thanks John
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