Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread Pieren
On Mon, Feb 11, 2013 at 2:08 AM, Andrew Errington erringt...@gmail.com wrote:

 How about drawing a single 'representative' way as you have been doing, and
 adding width=100?

?? and why not 500...
First, from what I can see on this aerial imagery, congratulation. It
is very hard to distinguish something on these pictures. What I see is
not a 'highway' but more an informal track in the desert or the
shortest way between point A and point B. Something that will
disappear or change after the next sandstorm.
Maybe try a new highway=track + tracktype=grade6 where grade6
would be defined as informal track in open area (e.g. desert); might
be an average of several parallel vehicles marks ?

Pieren

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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread Martin Koppenhoefer




Am 11/feb/2013 um 11:31 schrieb Pieren pier...@gmail.com:

 Maybe try a new highway=track + tracktype=grade6 where grade6
 would be defined as informal track in open area (e.g. desert); might
 be an average of several parallel vehicles marks ?


i use to add informal=yes as an additional attribute in similar cases. 

-1 to tracktype grade6

+1 to not add width=100 to one single generalized way, that would mean 
something very different.

cheers,
Martin
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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread Pieren
On Mon, Feb 11, 2013 at 11:55 AM, Martin Koppenhoefer
dieterdre...@gmail.com wrote:

 +1 to not add width=100 to one single generalized way, that would mean 
 something very different.

-1
Saying this road is 100m wide is a joke when you are in the middle of
the desert and try to simply follow the previous marks in the sand...

Pieren

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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread Andrew Errington
On Mon, 11 Feb 2013 19:31:06 Pieren wrote:
 On Mon, Feb 11, 2013 at 2:08 AM, Andrew Errington erringt...@gmail.com 
wrote:
  How about drawing a single 'representative' way as you have been doing,
  and adding width=100?

 ?? and why not 500...

Because the OP stated the extent of the parallel ways to be about 100m.

Best wishes,

Andrew

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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread Andrew Errington
On Mon, 11 Feb 2013 20:05:37 Pieren wrote:
 On Mon, Feb 11, 2013 at 11:55 AM, Martin Koppenhoefer

 dieterdre...@gmail.com wrote:
  +1 to not add width=100 to one single generalized way, that would mean
  something very different.

 -1
 Saying this road is 100m wide is a joke when you are in the middle of
 the desert and try to simply follow the previous marks in the sand...

You can easily see 100m.  The line on the map represents a route, it is not 
the route itself.  By setting the width to 100m you allow for a person to 
travel anywhere within a 100m wide path and still reach the destination.

OP asked for practical solutions.  Drawing a dozen or so meandering paths from 
point A to point B is not practical.

Best wishes,

Andrew

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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread Martin Koppenhoefer




Am 11/feb/2013 um 12:05 schrieb Pieren pier...@gmail.com:

 +1 to not add width=100 to one single generalized way, that would mean 
 something very different.
 
 -1
 Saying this road is 100m wide is a joke when you are in the middle of
 the desert and try to simply follow the previous marks in the sand...


that's what I wrote

Martin
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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-11 Thread John F. Eldredge
Andrew Errington erringt...@gmail.com wrote:

 On Mon, 11 Feb 2013 19:31:06 Pieren wrote:
  On Mon, Feb 11, 2013 at 2:08 AM, Andrew Errington
 erringt...@gmail.com 
 wrote:
   How about drawing a single 'representative' way as you have been
 doing,
   and adding width=100?
 
  ?? and why not 500...
 
 Because the OP stated the extent of the parallel ways to be about
 100m.
 
 Best wishes,
 
 Andrew
 
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I read his description as saying that, at their closest, the tracks were 100 
meters apart, which is why I suggested mapping all of them.

-- 
John F. Eldredge -- j...@jfeldredge.com
Reserve your right to think, for even to think wrongly is better than not to 
think at all. -- Hypatia of Alexandria

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[Tagging] Tagging 'averaged' paths in rural Mali

2013-02-10 Thread william skora
Hey everyone,

As you may know, HOT is currently mapping infrastructure in Mali. In flat
rual areas, there are
some 'highways' (unpaved ground) that are very close to each other (up to
~100 meters ) that all lead to the same villages or destinations.

Here is one example: http://binged.it/Y2XLqR

We have generally traced these like we have with GPX without satellite; one
average trace of the possible paths (since no one way is really more
important thatn the others). So we would like some sort of tag to add
additionally to not that in addition to being a highway=whatever this road
is not a simple centerline, but rather just an average and you shouldn't
try to follow it exactly (or necessarily expect to be able to follow it
exactly). As Andrew Buck in #hot noted, 'they are useful for understanding
the level of economic development in the area since they are sometimes
caused simply by the lack of someone actually building road (although in
most cases it just doesn't even make sense to build one)'.

Do you have any suggestions of how to tag these ways ?

Regards,
will
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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-10 Thread Martin Koppenhoefer
2013/2/10 william skora skorasau...@gmail.com:
 Hey everyone,

 As you may know, HOT is currently mapping infrastructure in Mali. In flat
 rual areas, there are
 some 'highways' (unpaved ground) that are very close to each other (up to
 ~100 meters ) that all lead to the same villages or destinations.

 Here is one example: http://binged.it/Y2XLqR

 We have generally traced these like we have with GPX without satellite; one
 average trace of the possible paths (since no one way is really more
 important thatn the others). So we would like some sort of tag to add
 additionally to not that in addition to being a highway=whatever this road
 is not a simple centerline, but rather just an average and you shouldn't try
 to follow it exactly (or necessarily expect to be able to follow it
 exactly). As Andrew Buck in #hot noted, 'they are useful for understanding
 the level of economic development in the area since they are sometimes
 caused simply by the lack of someone actually building road (although in
 most cases it just doesn't even make sense to build one)'.

 Do you have any suggestions of how to tag these ways ?


IMHO in first approximation it would be OK to simply draw one of these
(to create the connection, the most useful part) and eventually in a
later state you could add more of them. The fact that they run
parallelly doesn't mean each of them isn't a (high)way which could be
mapped on its own.

cheers,
Martin

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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-10 Thread John F. Eldredge
Martin Koppenhoefer dieterdre...@gmail.com wrote:

 2013/2/10 william skora skorasau...@gmail.com:
  Hey everyone,
 
  As you may know, HOT is currently mapping infrastructure in Mali. In
 flat
  rual areas, there are
  some 'highways' (unpaved ground) that are very close to each other
 (up to
  ~100 meters ) that all lead to the same villages or destinations.
 
  Here is one example: http://binged.it/Y2XLqR
 
  We have generally traced these like we have with GPX without
 satellite; one
  average trace of the possible paths (since no one way is really more
  important thatn the others). So we would like some sort of tag to
 add
  additionally to not that in addition to being a highway=whatever
 this road
  is not a simple centerline, but rather just an average and you
 shouldn't try
  to follow it exactly (or necessarily expect to be able to follow it
  exactly). As Andrew Buck in #hot noted, 'they are useful for
 understanding
  the level of economic development in the area since they are
 sometimes
  caused simply by the lack of someone actually building road
 (although in
  most cases it just doesn't even make sense to build one)'.
 
  Do you have any suggestions of how to tag these ways ?
 
 
 IMHO in first approximation it would be OK to simply draw one of these
 (to create the connection, the most useful part) and eventually in a
 later state you could add more of them. The fact that they run
 parallelly doesn't mean each of them isn't a (high)way which could be
 mapped on its own.
 
 cheers,
 Martin
 
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I agree that it would make sense to map all of them.  After all, in a city with 
streets arranged in a grid, streets run parallel to each other, often less than 
100 meters apart, and offer multiple routes to reach the same approximate 
destination, yet we map all of them, not an average route that doesn't 
correspond exactly to any of them.  Now, if you were mapping footpaths 
separated by only a meter or two, mapping an averaged path would make more 
sense.

-- 
John F. Eldredge -- j...@jfeldredge.com
Reserve your right to think, for even to think wrongly is better than not to 
think at all. -- Hypatia of Alexandria

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Re: [Tagging] Tagging 'averaged' paths in rural Mali

2013-02-10 Thread Andrew Errington
On Mon, 11 Feb 2013 01:46:43 william skora wrote:
 Hey everyone,

 As you may know, HOT is currently mapping infrastructure in Mali. In flat
 rual areas, there are
 some 'highways' (unpaved ground) that are very close to each other (up to
 ~100 meters ) that all lead to the same villages or destinations.
snip
 Do you have any suggestions of how to tag these ways ?

 Regards,
 will

How about drawing a single 'representative' way as you have been doing, and 
adding width=100?

Best wishes,

Andrew

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