Brian Russo wrote:
If I'm not mistaken the 256^2 PNG restriction is because that is what
the WMS-C standard specifies (A flaw in the standard IMO - most of our
tiles are JPG).
The WMS-C standard doesn't specify the tilesize nor the format. The Web
spherical mercator however does specify a tilesize (256x256) so that
explains the 256x256 in the proposal. I do agree that it makes more
sense to use JPEG in stead of PNG for imagery tiles however.
(Totally not trying to derail this main discussion)
(I'm derailing it even more)
Overall I think your revised standard looks great though I admit I
haven't pored over it in detail.
I did have one question about licensing.
"Each layer should be marked with the license of its source, including
(at a minimum) descriptive text for the license, plus flags for public
domain, attribution, non-commercial, and sharealike licensing. "
I'm skeptical on the real utility of OAM if these sort of restrictions
are put in place. My preference would be for including only public
domain imagery. Anything else and I think we may just end up with a
collage of differently licensed imagery and you have to jump through
hoops to figure out what imagery is licensed under what etc.. Not to
be dramatic, but I'd say it diminishes my interest in OAM as a large
part of my interest is rooted in the problem that right now
releasability/licensing issues is really the main draw for me. I.e.
we can use the basemap and/or release products knowing that other
people can use the basemap for "whatever".
You need to attach the license of the source data somehow to the layer.
Otherwise you end up in a legal swamp.
The other point you are raising; is OAM worthwhile (for a certain user)
if it contains non PD restrictions is a tough one. I'm not sure if CC-SA
is a good license: ' If you alter, transform, or build upon this work,
you may distribute the resulting work only under the same, similar or a
compatible license.' This seems to mean that any map you create with OAM
as a baselayer is suddenly CC-SA*). We have to create use cases for the
different license to make clear how one can use a layer. (like
http://wiki.openstreetmap.org/wiki/Open_Data_License/Use_Cases). Also we
need to think long and hard for the best license for our 'own' data
(since we cannot change the license from someone else's data). This
however is a completely different discussion and the technical proposal
does give us the freedom to do this in a different track, since it
allows for tracking the licenses of the data. In the end we still can
create a baselayer later on with only PD data so it can be used for
'whatever'.
Regards,
Steven
*) IANAL
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