[OSM-talk] Tag for true OSM data?

[Ed Avis]

Elizabeth Dodd <edodd <at> billiau.net> writes:

>>I think you can assume that if no 'source' tag is set, the feature is
>>done by traditional OSM mapping (survey, or GPS trace, or local
>>knowledge, or perhaps tracing from aerial imagery).
> 
>The use or not of "source" was found to mean two different things with
>Au mappers.
>Group G were using the absence of "source" as meaning GPS mapped
>Group T were using the absence of "source" as meaning Traced

Both of those are included in what I'd define as 'traditional OSM' without
imports.  So the rule is still sound: if there is no source tag, then it comes
from survey or GPS or aerial imagery.  But the dual property is not true.

There are however many cases where data does come from these sources and has an
explicit source tag anyway.  Australia is one example; Bing imagery is another,
where some editors automatically add source=Bing (even though we did not always
tag source=Yahoo in the old days).  So you will need to go through the possible
source tags and mark which ones you're interested in.

-- 
Ed Avis <eda at waniasset.com>