Hello,
On Mon, Sep 5, 2011 at 11:21 AM, Danilo gezuru@gmail.com wrote:
Hi Stéphane
Well, generally if you really have data that is very accurate, and can assure that the alignment of the data is correct, then I think it's great to provide high detail in OSM. Maybe with the source tag set to the image URL or something similar :)
Effectively as usual ;-)
But it would be strange if for example there are 500m^2 in Lausanne that are mapped high-detail using areas as roads, and the rest using lines as road. In that case I'd probably prefer consistency over accuracy.
Yes or no ;-) It's effectively true the it will be strange if we have a little area with very high accuracy and nothing any-more after but in the case (it not the case of Lausanne) where we have a small Orthophoto and not may data after that is a good to map this area with high accuracy. This to "thanks" (I don't know the right therm in English) the provider of the Orthophoto. And to show that if OSM have data imply that we use it to improve accuracy ;-)
CU Stéphane
I hope you understand my point.
Danilo
On Mon, Sep 5, 2011 at 11:10 AM, Stéphane Brunner courriel@stephane-brunner.ch wrote:
Hello Danilo,
Globally I'm OK with your message, except two thing.
- Why if in Lausanne we have a good Orthophoto we shouldn't "use it"
because not almost Switzerland have one ?
- Why does we need an Orthophoto that are accurate up to a few
centimeters to place landuse who is at something between 2 and 10 meter to the center of the road ?
CU Stéphane
On Sun, Sep 4, 2011 at 10:03 PM, Danilo gezuru@gmail.com wrote:
My opinion about this issue:
As long as we don't have either up to date, high resolution, offset-corrected aerial imagery for almost all of switzerland or positioning devices that are accurate up to a few centimeters, I don't really see the point of tracing the borders of paths and small roads, as the accuracy can't be determined by someone who looks at the map. High details in mapping send a message of accuracy. If that accuracy can't be guaranteed, it might be better to map less detailed. Else, people will stop to rely on the OSM data, because they're very unsure about the accuracy.
As for correcting other people's work, I agree that this should only be done if one is sure that the other person's changes are indeed erroneous. E.g. if there are up to date high resolution and *correctly aligned* satellite images, or if you have accurate GPS traces yourself. If you're unsure, you should leave it as it is, and check reality first. Satellite images might be off a little.
Concerning mapping larger objects as wide roads or rivers as areas, I don't see the problem. But to map the borders of small objects accurately, one needs an accurate data source.
Danilo
On Sun, Sep 4, 2011 at 9:10 PM, Simon Poole simon@poole.ch wrote:
There was just, for the umpteenth time, exactly this discussion on talk-de, naturally without a conclusion.
Essentially both ways of mapping are "right", the one is more the classical cartographers generalised way of doing things, the other probably a bit more the chaotic OSM way.
I'm personally more in favour of the later because I believe it leads to less problems with edits from a large number of editors with very different ways of doing things.
But in any case both methods are perfectly valid and ok.
Simon
PS: when everything is mapped as areas including roads the problem will go away :-)
Am 04.09.2011 16:12, schrieb Stéphane Brunner:
Hello every body,
English bellow.
====
Je suis désolé de cous importuner avec ça mais j'ai un problème avec le contributeur Shernott (http://www.openstreetmap.org/user/Shernott) ou je n'arrive pas du tout avoir une discutions constructive.
Ce que je retiens de la discussion c'est qu'il méprise les contributions des autres et que les sienne par contre sont irréprochable.
Bien sur j'espère me tromper sur l'image que j'ai de lui et j'ai aussi mon lot d'erreur mais actuellement je suis dans une impasse).
Le point central de divergence c'est qu'il veut absolument que toutes les zones aillent jusqu'au centre des routes ce qui va a l’encontre d'un véritable plan de zone de bonne qualité comme [1]. Et il est vrai que je ne veut pas un OSM au rabais.
Pour être claire j'ai joint les messages échangé.
Actuellement je n'ai pas répondu aux 2 derniers messages.
Merci d'avance.
====
I'm sorry to bother you with that but I have a problem with the contributor Shernott (http://www.openstreetmap.org/user/Shernott) with one I can't have a constructive discussion.
What I retain of the discussion is that he despises the contributions of others and hos one are irreproachable.
Of course I hope I am wrong on the image I have of him and I also have my share of errors but actually I am at a dead end).
The point of divergence is that it insists that all areas go to the center of roads which doesn't go to the direction of having good accurate zone plan like [1]. It is true that I do not want an OSM at a discount.
To be clear I join all the exchanged messages.
Acctually I havn't responded to the two last message.
Thanks in advance.
====
[1] http://sitn.ne.ch/mapfish/amenagement?map_x=561220&map_y=204650&map_...
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