[georss] bbox for Dublin Core?

[Stefan F. Keller]

Simon,



2006/7/31, Simon.Cox at csiro.au <Simon.Cox at csiro.au>:

> I developed the dcmi:Box and dcmi:Point encodings ...

> (a) in response to questions begged by the existence of the

>     dc:coverage element

> (b) in the context of helping to establish a "lightweight"

>     extensibility mechanism for Dublin Core.

>

> At the time I was not very familiar with the ISO 19100 series,

> so missed an opportunity to harmonize terminology.

> Note that

>

> (i) "projection" should be used for Coordinate Reference System

> information (per ISO 19111).

> The OGC urn scheme provides more robust identifiers than the

> EPSG:4326 syntax.  Also note that general CRS schemes are not

> restricted to north/south/east/west.

>

> (ii) In the original versions (e.g.
http://dublincore.org/documents/2000/07/28/dcmi-box>)

> the dcmi encodings "projection" was optional with a default of

> "geographic, height relative to mean-sea-level". This information

> was hidden away in the DTD fragment. I didn't know how to write

> specs then. This probably also explains why the information got

> lost in the recent revision
http://dublincore.org/documents/dcmi-box/index.shtml.

> Pete - it might be worth making sure this gets added back in.

>

> (iii) gml:Envelope implements GM_Envelope from ISO 19107.

> Note that, even though it is implemented in terms of the

> lower and upper corners, strictly GM_Envelope is *not* a

> "rectangle", but rather is a range of coordinate values - i.e.

> it is not a geometric figure. Probably not important here.

> It is obvious how to transform dcmi:Box information to a

> gml:Envelope.

>

> Simon



Many thanks for your answer (I'm posting it here because it seems not
showing up in this list).



I have to think over how to proceed but I really would like to  have a valid
and commonly accepted encoding for bbox within Dublin Core which ideally
would be 'harmonized' with GeorSS (Simple).



I also still wonder how geodata.gov handled this issue when it uses OAI-PMH
which has Dublin Core as its default information model.



-- Stefan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.eogeo.org/pipermail/georss/attachments/20060731/06f9d014/attachment.html