Re: [Tagging] question: best practices for micromapping ped areas and footpaths?

2014-12-30 Thread johnw

 On Dec 30, 2014, at 4:29 PM, Marc Gemis marc.ge...@gmail.com wrote:
 
 
 On Tue, Dec 30, 2014 at 5:27 AM, johnw jo...@mac.com mailto:jo...@mac.com 
 wrote:
 I mapped the open sections as highway=pedestrian+area=yes, while I traced the 
 covered walkways (that connect the bus shelters) and tagged it as 
 building=roof  highway=footway
 
 For me this means that you walk on the roof. You should have 2 separate OSM 
 objects, one for the roof and one for the footway. The roof should be tagged 
 as building=roof, layer=1.
 

Ahh, I see - that makes sense. 

so,  I should leave the pedestrain areas as they are, and add an additional 
area for the roof (so I would have two areas - one the footpath and the other a 
roof with the adjacent areas as pedestrian)  

or 

make the entire area highway=pedestrian and have the building=roof are on a 
layer above it? 


BTW, highway=pedestrian+area=yes does not play nice with the layer tag - it 
renders over everything else, even when separated by layers (last time I 
checked). does this mean I should tag it in some other (more correct) fashion, 
or is this simply a rendering error that needs to be resolved and I should 
refrain from tagging for the renderer? 


Javbw

 regards
 
 m
 ___
 Tagging mailing list
 Tagging@openstreetmap.org
 https://lists.openstreetmap.org/listinfo/tagging

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Feature Proposal - RFC - Water tap

2014-12-30 Thread Friedrich Volkmann
On 04.12.2014 10:31, Kotya Karapetyan wrote:
 For me, English common sense says a 'water source' could be a river,
 lake, spring etc...
 the portability of water is not a measure of its source (where it comes
 from) but its purity...
 
 So I'd think the key should be
 
 Water_purity  with the key values 'potable', 'nonpotable' and 'unknown'
 ('yes' does not imply anything in the context of water purity nor water
 source).
 
 That key can be added to rives, lakes, drinking fountains etc etc .. no
 changes are required for present tags. Simply the additional information
 can be added. 
 
 
 Warin, I don't know if you followed the discussion and saw the proposal in
 the wiki. 
 In short, it all started with the lack of good option to map a source of
 non-potable water, like a water tap. It evolved from there to the current
 state. The proposal from the last email reflects  to ~90 % everything
 suggested as the discussion proceeded.

In German, we have a verb verschlimmbessern, which means to make something
worse by improving it. I agree with Warin that water_source=potable does not
seem right. It mixes source (origin) and target (use). water_source=* may be
fine with another set of values, and *=potable may be fine with another key
(drinkable=* and drinking_water=* are in use, and water:quality=* and
water_purity=* were suggested in this discussion).

-- 
Friedrich K. Volkmann   http://www.volki.at/
Adr.: Davidgasse 76-80/14/10, 1100 Wien, Austria

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] question: best practices for micromapping ped areas and footpaths?

2014-12-30 Thread Hubert
Hallo. 
Maybe covered=yes http://wiki.openstreetmap.org/wiki/Key:covered is what you 
are looking for?
Yours Hubert

Am 30. Dezember 2014 05:27:43 MEZ, schrieb johnw jo...@mac.com:
I'm micromapping some public areas, in this case train stations. two
questions:

1)  there are large open concrete areas for pedestrians, but there are
also covered walkways through them as well. 

http://www.openstreetmap.org/edit#map=19/36.38380/139.07281

I mapped the open sections as highway=pedestrian+area=yes, while I
traced the covered walkways (that connect the bus shelters) and tagged
it as building=roof  highway=footway

I'm not sure if I should just create single area of highway=pedestrian
and put the building=roof over it or what. Also, the roof doesn't
render as a building, but as a white pedestrian area. I think if it is
tagged at building=roof, I should ask -carto to render it as a
building, but it logically remains a footpath as well.  

I'm unsure of how to tag it all. I assume I have made a mistake mixing
pedestrian and footway tags. 


2) what is the best practices for tracing sidewalks? when following a
sidewalk along a road, and you reach an intersection, does the footpath
way cross the road via the sidewalk (continuing along the road, or does
it turn the corner, following the sidewalk encompassing the block, and
the sidewalks are separate ways ( rather than a node)  that join
disparate footpaths at the corners of the intersection? 

This is an intersection mapped with footpaths following the sidewalks
around the block, with sidewalk ways connecting the corners at the
intersection. 
http://www.openstreetmap.org/edit#map=20/36.42339/139.05830


I'm guessing for simplicity, the way follows the street through the
intersections, but to map the sidewalk as a way would require
segmentation of the ways anyways, so following the sidewalk around the
corner seems to be a cleaner choice, especially with the heavy paint
work here in Japan for sidewalks. 


Javbw
___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging

-- 
Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet.___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] question: best practices for micromapping ped areas and footpaths?

2014-12-30 Thread Marc Gemis
On Tue, Dec 30, 2014 at 9:40 AM, johnw jo...@mac.com wrote:

 make the entire area highway=pedestrian and have the building=roof are on
 a layer above it?


I would go for this option.
You could go for covered=xxx as well, as Hubert indicated


 BTW, highway=pedestrian+area=yes does not play nice with the layer tag -
 it renders over everything else, even when separated by layers (last time I
 checked). does this mean I should tag it in some other (more correct)
 fashion, or is this simply a rendering error that needs to be resolved and
 I should refrain from tagging for the renderer?


I consider this as a render issue.

regards

m
___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] question: best practices for micromapping ped areas and footpaths?

2014-12-30 Thread Janko Mihelić
2014-12-30 9:40 GMT+01:00 johnw jo...@mac.com:


 Ahh, I see - that makes sense.

 so,  I should leave the pedestrain areas as they are, and add an
 additional area for the roof (so I would have two areas - one the footpath
 and the other a roof with the adjacent areas as pedestrian)

 or

 make the entire area highway=pedestrian and have the building=roof are on
 a layer above it?


 BTW, highway=pedestrian+area=yes does not play nice with the layer tag -
 it renders over everything else, even when separated by layers (last time I
 checked). does this mean I should tag it in some other (more correct)
 fashion, or is this simply a rendering error that needs to be resolved and
 I should refrain from tagging for the renderer?


This is deliberate, and was explained in a mail in June:

https://lists.openstreetmap.org/pipermail/tagging/2014-June/018043.html

highway=pedestrian + area=yes will always be over everything else. There's
nothing you can do about it, except make your own renderer :) Or try to
change their minds here:

https://github.com/gravitystorm/openstreetmap-carto/issues/688

As for your mapping, If you ask me, it would be better to map sidewalks as
lines tagged with highway=footway. That makes it much easier for routers to
get you to your wanted platform. If you really want to map sidewalk areas,
you can tag them as area:highway=footway. It's currently just a proposed
tag, but I think its philosophy is the best so far for mapping areas of
highways.

 Janko
___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] question: best practices for micromapping ped areas and footpaths?

2014-12-30 Thread Matthijs Melissen
On 30 December 2014 at 11:14, Janko Mihelić jan...@gmail.com wrote:
 This is deliberate, and was explained in a mail in June:

 https://lists.openstreetmap.org/pipermail/tagging/2014-June/018043.html

 highway=pedestrian + area=yes will always be over everything else. There's
 nothing you can do about it, except make your own renderer :) Or try to
 change their minds here:

 https://github.com/gravitystorm/openstreetmap-carto/issues/688

Note that this issue is still open, which means we recognize this is a
problem with the rendering.

-- Matthijs

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] oneway=no spams

2014-12-30 Thread moltonel 3x Combo
On 28/12/2014, Ole Nielsen / osm on-...@xs4all.nl wrote:
 It depends. Sometimes it is useful to add this tag. I typically add it to
 bidirectional cycle paths along roads as you would normally expect such
 cycleways to be oneway. Adding a oneway=no indicates that it has been
 surveyed and found to be bidirectional and will further prevent eager
 mappers adding the missing oneway=yes tag to this cycleway.

Another usecase that was presented on the list at some stage is town
centers that have more oneways than not (I think the example was in
Spain). In that context, oneway=no is usefull for mappers.

I'm sure that most foo=default_value tags are the result of
cluelessness/mishaps, but it's not always the case.

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] oneway=no spams

2014-12-30 Thread Friedrich Volkmann
On 28.12.2014 17:45, Mateusz Konieczny wrote:
 you'd probably want to discuss that over at
 https://github.com/openstreetmap/iD/issues;
 
 I thought that https://github.com/openstreetmap/iD/issues/2220 will fix this
 problem.

Maybe that's why most of the oneway=no I checked come from Potlatch. I know
little about that editor, because there's no Flash plugin available for my
platform.

-- 
Friedrich K. Volkmann   http://www.volki.at/
Adr.: Davidgasse 76-80/14/10, 1100 Wien, Austria

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Feature Proposal - RFC - Water tap

2014-12-30 Thread Kotya Karapetyan
Einverstanden :)
Please vote:
https://wiki.openstreetmap.org/wiki/Proposed_features/water_tap#Voting

Cheers,
Kotya

On Tue, Dec 30, 2014 at 11:08 AM, Friedrich Volkmann b...@volki.at wrote:

 On 04.12.2014 10:31, Kotya Karapetyan wrote:
  For me, English common sense says a 'water source' could be a river,
  lake, spring etc...
  the portability of water is not a measure of its source (where it
 comes
  from) but its purity...
 
  So I'd think the key should be
 
  Water_purity  with the key values 'potable', 'nonpotable' and
 'unknown'
  ('yes' does not imply anything in the context of water purity nor
 water
  source).
 
  That key can be added to rives, lakes, drinking fountains etc etc ..
 no
  changes are required for present tags. Simply the additional
 information
  can be added.
 
 
  Warin, I don't know if you followed the discussion and saw the proposal
 in
  the wiki.
  In short, it all started with the lack of good option to map a source of
  non-potable water, like a water tap. It evolved from there to the current
  state. The proposal from the last email reflects  to ~90 % everything
  suggested as the discussion proceeded.

 In German, we have a verb verschlimmbessern, which means to make
 something
 worse by improving it. I agree with Warin that water_source=potable does
 not
 seem right. It mixes source (origin) and target (use). water_source=* may
 be
 fine with another set of values, and *=potable may be fine with another key
 (drinkable=* and drinking_water=* are in use, and water:quality=* and
 water_purity=* were suggested in this discussion).

 --
 Friedrich K. Volkmann   http://www.volki.at/
 Adr.: Davidgasse 76-80/14/10, 1100 Wien, Austria

 ___
 Tagging mailing list
 Tagging@openstreetmap.org
 https://lists.openstreetmap.org/listinfo/tagging

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Feature Proposal - RFC - Water tap

2014-12-30 Thread Kotya Karapetyan
I agree.

Voting page:
https://wiki.openstreetmap.org/wiki/Proposed_features/water_tap#Voting

Thanks everyone for the in-depth consideration.

Cheers,
Kotya



On Mon, Dec 29, 2014 at 12:01 PM, Warin 61sundow...@gmail.com wrote:

 On 29/12/2014 9:33 PM, tagging-requ...@openstreetmap.org wrote:

 Message: 8
 Date: Mon, 29 Dec 2014 02:18:28 -0800
 From: Bryce Nesbittbry...@obviously.com
 To: Tag discussion, strategy and related tools
 tagging@openstreetmap.org
 Subject: Re: [Tagging] Feature Proposal - RFC - Water tap (Kotya
 Karapetyan)
 Message-ID:
 CAC9LFPe1V1VMf=wJzs_HxE-cuL9HO4XE0_Zx1UH_MO-aCABZrQ@
 mail.gmail.com
 Content-Type: text/plain; charset=utf-8

 On Thu, Dec 4, 2014 at 4:22 AM, Martin Koppenhoeferdieterdreist@
 gmail.com
 wrote:

 
 not sure if purity is a good choice. Completely pure water is not
 potable (distilled water), you'd die if you drank too much (OK, you'll
 also
 die when drinking too much normal water [1], but the second too
 much is
 much more than the first).
 

 purity is a judgement call.
 Generally those don't go well in OSM.

 How about tags for signage, e.g. It's marked as potable, it's marked as
 untested, it's marked as non-potable.
 -- next part --
 An HTML attachment was scrubbed...
 URL:http://lists.openstreetmap.org/pipermail/
 tagging/attachments/20141229/8e58bbdf/attachment-0001.html

 --


 I suggest the tag for taps go ahead for voting. But remove all the
 purity/potable things .. just vote on the tap. I don't see any problem
 there.

 The sub tag for potable can then be raised as a separate wiki entry .. and
 discussion on 'portable' continued. Such as when the tap carries no
 marking; I'd think this will be country sepcific .. some countries will
 have unmarked taps as potable, other countries as non-potable, and others
 as 'unknown'. Note that this sub tag can be applied to things other than
 taps... springs, fountains ...

 ___
 Tagging mailing list
 Tagging@openstreetmap.org
 https://lists.openstreetmap.org/listinfo/tagging

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Accuracy of survey

2014-12-30 Thread Kotya Karapetyan
Hi Warin and all,

I am not sure what you dislike in accuracy. Accuracy is how far the
measured mean value is from the actual value (
http://en.wikipedia.org/wiki/Accuracy_and_precision). However we can start
calling it a trueness, to follow the ISO definition. If you mean
something else, please explain, and I believe it would deserve a page in
OSM wiki.

Now, I am talking about the absolute trueness. That is, how far a POI is
according to the map from its actual position on the planet. No, I don't
forget that the planet surface is moving relative to the GPS coordinates.
Even more so, there are local surface movements, especially if the survey
marker is located, say, on a bridge or close to an excavation site. It
should be considered when defining this non-movable POIs.

Taking into account the inherent precision of the survey marker position
(they are designed to have a well-defined position), it does make sense to
have OSM data for them defined better than for all usual elements.

At the same time, if you are talking about common use, these POIs are of
little interest to normal users. So their specific properties will not
disturb anyone.
However, some mappers may be in possession of the surveying tools allowing
them to have better trueness than possible with a GPS, provided that they
have some good reference points. Survey markers are designed just for that.
For these mappers, the absolute location of the survey markers is
important, and I see no reason to prevent them from having it in OSM.

 OSM renders distort road widths according to their classification .. that
is normal mapping for road navigation. If you wanted air navigation then
the actual road width would be better to render, with runways having more
emphasis.

True. However the underlying data is independent from how a specific
renderer represents each element. A street is usually just a line, thus
having no width.

Cheers,
Kotya



On Tue, Dec 30, 2014 at 12:50 AM, Warin 61sundow...@gmail.com wrote:

  On 30/12/2014 6:41 AM, tagging-requ...@openstreetmap.org wrote:

 Date: Mon, 29 Dec 2014 15:27:23 +0100
 From: Kotya Karapetyan kotya.li...@gmail.com kotya.li...@gmail.com
 To: Rainer Fügenstein r...@oudeis.org r...@oudeis.org, Tag discussion, 
 strategy and
   related tools tagging@openstreetmap.org tagging@openstreetmap.org
 Subject: Re: [Tagging] Accuracy of survey
 Message-ID:
   cak2dj-whwqajz+0-oxjue9bhn-w1eldcypm4am4xidn2fp5...@mail.gmail.com 
 cak2dj-whwqajz+0-oxjue9bhn-w1eldcypm4am4xidn2fp5...@mail.gmail.com
 Content-Type: text/plain; charset=utf-8


 Since such reference points are quite common, I would support the idea of
 creating a special tag for them, requiring that they are not moved. However
 we need a clear consensus on how we define the sufficient accuracy and
 how the data for such points will be updated.

  Ultimate 'accuracy'? You do realise that the tectonic plates are moving?
 So your reference points need to include a date so they can be corrected
 for the drift. You'll find that data is available for those survey
 reference points .. together with their precision. Do you want to update
 these points to maintain their 'accuracy'? How often?
 Survey reference points are 'quite common' in built up areas ... but not
 in remote locations. And depending an the age and how precise the survey
 was will have some effect on their 'accuracy'. One surveor in Australia
 forget to allow for the temperature effect on this measurement chain 
 back when chains were used.


 I disagree with the point of view that an accuracy sufficient for consumer
 GPS devices is sufficient for OSM and therefore there is no problem here.
 Nobody ever declared that OSM is for smartphone users. We are trying to map
 the world, and accuracy should be of primary interest for this project.



 Again the word 'accuracy'.

 Context 1.
 I have advised one mapper in their diary that most, if not all, users will
 be using their data entry with similar equipment to what they have .. so
 any 'inaccuracy' will also be present for the other users. Thus what they
 map should represent what is there and should be usable as a map ..
 considering that the GPS information may be very vague under the tree cover
 present and the local cliffs etc.

 Context 2
 I will be mapping a track that is covered in a few places  .. by an over
 hanging cliff. As such it is not visible by satellite .. nor will the GPS
 track be that 'accurate'. So I'll be mapping it from the available
 information that I have then - a few photos, my track and the satellite
 image. It will take me about a week to traverse the area. No shops etc.

 I would rather have the less 'accurate' representation of what is there
 compared to a blank area. I've plotted one track that goes from one place
 to another (personal knowledge).. where it is not visible on the satellite
 view I've plotted it as a straight line.. I know it is not a straight line
 but it is the best I can do and conveys the 

Re: [Tagging] lanes=-1 especially in Canada

2014-12-30 Thread John F. Eldredge

On 12/29/2014 04:16 AM, Bryce Nesbitt wrote:

I rolled the map-roulette wheel, and found a series of highways in
Canada marked with lanes=-1, all part of a CANVEC import.

I see 17,943 uses of this value: it's less popular than 5 lanes but more
popular than 6.
What does it mean, if anything?


___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging



It may well mean what it says, a one-lane road.  Some rural areas in the 
USA still have one-lane roads, with occasional wider spots where one 
vehicle can pause to allow a vehicle going the other direction to pass 
by.  Given how sparsely-populated some of the northern regions of Canada 
are, I would not be surprised to find some one-lane roads, and some 
extensive areas with no roads at all.


--
John F. Eldredge -- j...@jfeldredge.com
Darkness cannot drive out darkness; only light can do that.
Hate cannot drive out hate; only love can do that.
Dr. Martin Luther King, Jr.

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Accuracy of survey

2014-12-30 Thread Rainer Fügenstein

W Ultimate 'accuracy'? You do realise that the tectonic plates are moving?

btw: as a result of the Mar.2011 earthquake, japan has moved by at
least 5m. how did OSM react?


___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] lanes=-1 especially in Canada

2014-12-30 Thread Janko Mihelić
2014-12-30 22:16 GMT+01:00 John F. Eldredge j...@jfeldredge.com:


 It may well mean what it says, a one-lane road.  Some rural areas in the
 USA still have one-lane roads, with occasional wider spots where one
 vehicle can pause to allow a vehicle going the other direction to pass by.
 Given how sparsely-populated some of the northern regions of Canada are, I
 would not be surprised to find some one-lane roads, and some extensive
 areas with no roads at all.


I think you missed the minus sign. It's minus one lanes.
___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Replying to raw digests considered harmful

2014-12-30 Thread moltonel 3x Combo
On 28/12/2014, Paul Johnson ba...@ursamundi.org wrote:
 Could you please consider either subscribing to the nondigested version of
 the mailing list https://lists.openstreetmap.org/listinfo/tagging or use
 procmail to split each digest into it's constituent messages
 http://pm-doc.sourceforge.net/doc/#splitting_digest?  Replying to the
 emails containing the digested mbox breaks threading by not preserving the
 In-Reply-To or Subject headers and makes everyone else's mailboxes harder
 to manage (particularly for folks filtering by thread; most folks are
 likely to filter anything with digest in the subject straight to trash or
 mute it without reading).

+1. For what it's worth, I have little enough time available for
mailing lists that I just delete digest replies without reading them
(I check the subject before deciding to read or delete a thread).

While you're at it, could you please consider not top-posting, only
quoting the relevant parts in your replies, and hitting compose
instead of reply when you're starting a new thread ? :)

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] lanes=-1 especially in Canada

2014-12-30 Thread John F. Eldredge

On 12/30/2014 03:16 PM, John F. Eldredge wrote:

On 12/29/2014 04:16 AM, Bryce Nesbitt wrote:

I rolled the map-roulette wheel, and found a series of highways in
Canada marked with lanes=-1, all part of a CANVEC import.

I see 17,943 uses of this value: it's less popular than 5 lanes but more
popular than 6.
What does it mean, if anything?


___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging



It may well mean what it says, a one-lane road.  Some rural areas in the
USA still have one-lane roads, with occasional wider spots where one
vehicle can pause to allow a vehicle going the other direction to pass
by.  Given how sparsely-populated some of the northern regions of Canada
are, I would not be surprised to find some one-lane roads, and some
extensive areas with no roads at all.



I just re-read this, and realized that the value was negative 1, not 
positive 1.  Negative 1 probably represents some editor program's way of 
tagging lanes as unknown.


--
John F. Eldredge -- j...@jfeldredge.com
Darkness cannot drive out darkness; only light can do that.
Hate cannot drive out hate; only love can do that.
Dr. Martin Luther King, Jr.

___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] lanes=-1 especially in Canada

2014-12-30 Thread Guillaume Pratte
There are many of these lanes=-1 in the Canvec import in Quebec. I would assume 
they mean ‘Unknown’.

In my opinion we could just delete them all (at least in Quebec) since they 
bring no pertinent information.

Guillaume

 Le 2014-12-30 à 16:16, John F. Eldredge j...@jfeldredge.com a écrit :
 
 On 12/29/2014 04:16 AM, Bryce Nesbitt wrote:
 I rolled the map-roulette wheel, and found a series of highways in
 Canada marked with lanes=-1, all part of a CANVEC import.
 
 I see 17,943 uses of this value: it's less popular than 5 lanes but more
 popular than 6.
 What does it mean, if anything?
 
 
 ___
 Tagging mailing list
 Tagging@openstreetmap.org
 https://lists.openstreetmap.org/listinfo/tagging
 
 
 It may well mean what it says, a one-lane road.  Some rural areas in the USA 
 still have one-lane roads, with occasional wider spots where one vehicle can 
 pause to allow a vehicle going the other direction to pass by.  Given how 
 sparsely-populated some of the northern regions of Canada are, I would not be 
 surprised to find some one-lane roads, and some extensive areas with no roads 
 at all.
 
 -- 
 John F. Eldredge -- j...@jfeldredge.com
 Darkness cannot drive out darkness; only light can do that.
 Hate cannot drive out hate; only love can do that.
 Dr. Martin Luther King, Jr.
 
 ___
 Tagging mailing list
 Tagging@openstreetmap.org
 https://lists.openstreetmap.org/listinfo/tagging


___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] Accuracy of survey

2014-12-30 Thread Martin Koppenhoefer
2014-12-24 0:21 GMT+01:00 Friedrich Volkmann b...@volki.at:

 I used estimated_accuracy=* or gps_accuracy=* a couple of times, but I
 doubt
 that it prevents other mappers from moving or even deleting them. Some use
 editors like Potlatch, so they are not aware of tags. Some do thousands of
 edits, all of which are validator based corrections. They do not ask nor
 think nor look at tags, except at those reported by the validator.





the effects of those semi-mass-edits or other careless following edits
must not be feared too much: as long as the original tag is preserved
(otherwise it will unlikely be noticed unless it is searched for) other
mappers might take a look and see from the history to which coordinates the
note belongs. I think notes are a good way of passing particular
information about the survey conditions to other mappers.

Positional accuracy should not be overestimated, in dense areas it is more
important to have good relative positioning (things should relate in the
map like they do in the real world, e.g. with regard to left or right side
of the road, crossing in the same point or 2 adjacent crossings, angles,
line of sight, size relations, parallel vs. not, etc. In these settings you
typically won't find a GPS of much use when mapping today in a well mapped
urban area. In lower density areas (e.g. countryside, mountain areas) it
usually doesn't matter to have cm-precision, 10-15m are more than
sufficient, bare some potentially very rare counter examples.

Still I can understand that when you use equipment with significant higher
or lower precision than average you'd want to have a dedicated tag to
formalize entering the presumed precision in a machine readable way. just
do it ;-)

Cheers,
Martin
___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging


Re: [Tagging] lanes=-1 especially in Canada

2014-12-30 Thread Martin Vonwald
2014-12-30 22:36 GMT+01:00 Janko Mihelić jan...@gmail.com:

 2014-12-30 22:16 GMT+01:00 John F. Eldredge j...@jfeldredge.com:


 It may well mean what it says, a one-lane road.  Some rural areas in the
 USA still have one-lane roads, with occasional wider spots where one
 vehicle can pause to allow a vehicle going the other direction to pass by.
 Given how sparsely-populated some of the northern regions of Canada are, I
 would not be surprised to find some one-lane roads, and some extensive
 areas with no roads at all.


 I think you missed the minus sign. It's minus one lanes.


When I read this, some small bell rang at the backside of my brain. If
think I remember that a few years ago I read somewhere in the wiki, that
lanes=-1 means a very narrow road. I might be completely mistaken and I'm
pretty sure that this was already removed from the wiki, but that might be
the origin of it. Of course it doesn't make any sense to use lanes=-1 for
that; instead simply use width.

Best regards,
Martin
___
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging