[OSM-talk] source=Google

Yohan Boniface yohanboniface at free.fr
Sat May 18 14:26:37 UTC 2013


On 05/18/2013 03:55 PM, malenki wrote:
> Dave F. wrote:
>> IMO Source should be on the object, not on the changeset.
>
> +1 (except if there is one changeset for one object (; )

This is not my opinion. Let's take a simple example: a school.

Some first user maps it from imagery, and so just draws the building.
So we have something like:
building=yes
source=Bing

Now someone who went on the place add the fact that this building is a 
school. So we have something like:
building=yes
amenity=school
name=Ecole de la Vie
source=Bing;survey

Now, the public administration release an open data file with many 
informations on every schools. Someone takes this info and add it to our 
school. So we have now, for example:
building=yes
amenity=school
name=Ecole de la vie
capacity=1800
wheelchair=yes
addr:street=Rue de la Vie
addr:housenumber=42
source=?

Now, we have the opportunity to fly a drone on the area, and so we have 
a very accurate imagery, which is great. So someone goes on our building 
way and move it a little bit, change a little bit the shape to better 
follow the reality, etc.

So the question is: now, what should be the source tag value? And which 
of every attributes or geo informations is covered by this value?

My personal answer is that the source should be on the changeset, which 
is where the data comes from.


Yohan





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