[OSM-talk] Bing maps is misplaced

john at jfeldredge.com john at jfeldredge.com
Mon Dec 20 00:18:39 GMT 2010


OK, but there will likely be additional details available from visiting the site in person that you wouldn't be able to detect from an aerial view, plus you would be able to tell if the road had been modified since the aerial photo had been taken.

-------Original Email-------
Subject :Re: [OSM-talk] Bing maps is misplaced
From  :mailto:seav80 at gmail.com
Date  :Sun Dec 19 18:00:21 America/Chicago 2010


For *that* particular imagery, yes.

My point is that blindly saying that you shouldn't trace from imagery
if you haven't visited the place is not a hard rule. There are a lot
of circumstances when tracing is actually OK.


On Mon, Dec 20, 2010 at 3:19 AM, John F. Eldredge <john at jfeldredge.com> wrote:
> So, you are saying that you feel OpenStreetMap should reflect the status of the road when the aerial photo was made, rather than the current status?
>
> -------Original Email-------
> Subject :Re: [OSM-talk] Bing maps is misplaced
> From  :mailto:seav80 at gmail.com
> Date  :Sun Dec 19 10:17:51 America/Chicago 2010
>
>
> On Sun, Dec 19, 2010 at 8:04 PM, M∡rtin Koppenhoefer
> <dieterdreist at gmail.com> wrote:
>> 2010/12/15 Steve Bennett <stevagewp at gmail.com>:
>>> I'm sorry, but no. This is not common practice, nor is it desirable.
>>> Could we please not give advice which only reflects personal
>>> preferences?
>>>
>>> Fwiw, highway=road is for when you know *nothing* about a road. Can
>>> you tell me, hand on heart, that you would not tag this road:
>>>
>>> http://www.nearmap.com/?ll=-38.107325,145.15275&z=20&t=k&nmd=20101020
>>>
>>> as highway=residential, maxspeed=50, surface=paved, lanes=2?
>>
>>
>> If I knew the road I would surely do it. For the_point_ you linked
>> to, it seems correct (the maxspeed at least for one direction), but I
>> still would have to guess, that this maxspeed is valid for the other
>> direction as well (probably yes, but you cannot be sure) and that it
>> is valid for the whole road.
>
> If I was a tourist and I went to that particular spot and saw that
> "50" on the ground, I still wouldn't know if the speed limit is just
> for one direction or both and if it applies to the whole road. So even
> if I were on the ground, my information would not be much better than
> if I traced from that particular aerial imagery.
>
>> Don't know if it is a residential street either (could be unclassified
>> or tertiary). Of course you don't know for other restrictions (e.g.
>> weight, but also access=destination, ...). You can be quite sure for
>> the information you provided above, but still you don't know if some
>> important information (like access=destination) that you surely would
>> insert if you had visited the place, is missing.
>
> OSM's a wiki, so other people can add those details. There's no need
> to have everything topnotch on the first edit. Otherwise we'd have a
> pretty blank map.
>
>> This discussion is simply about the quality level: are you satisfied
>> with probable information derived from an aerial photo depicting the
>> situation some years ago, or do you want to insert only information
>> you verified on the ground and you can guarantee for?
>
> For aerial imagery that is of a high resolution and recency as
> Nearmap's, I would rather trust an Australian to trace and add data
> from that imagery even if he/she has not been to the place than if I
> were to actually visit that place and add details from on the ground.
>
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> --
> John F. Eldredge -- john at 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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-- 
John F. Eldredge -- john at 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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