Offering a way of stating that altitude is not known is useful. The document should register altitude type of 0 and register the meaning to indicate that the altitude is not known (note: this does not mean that altitude = 0, any more than it indicates an altitude of 35,000km).
Information on the implications of choosing to include no altitude should be included in the description of each datum (including its impact on the EPSG code and URN). GML conversion examples should note the impact of this attribute.
This opinion is extracted from draft-thomson-geopriv-3825bis. Text from that document can be used to address this issue if this opinion is supported by the consensus of the working group.
--Martin
> -----Original Message-----
> From: geopriv issue tracker [mailto:trac@tools.ietf.org]
> Sent: Tuesday, 9 June 2009 2:26 PM
> To: Thomson, Martin
> Cc: geopriv@ietf.org
> Subject: [geopriv] #8: Altitude type of 0 == no altitude
>
> #8: Altitude type of 0 == no altitude
> ---------------------------------------+-------------------------------
> -----
> Reporter: martin.thomson@andrew.com | Owner:
> Type: defect | Status: new
> Priority: major | Milestone:
> Component: rfc3825bis | Version:
> Severity: - | Keywords: altitude
> ---------------------------------------+-------------------------------
> -----
> RFC 3825 seems to indicate that an altitude type of 0 indicates that
> there
> is no altitude defined. This needs to be clearer in the bis.
>
> Q: is altitude type 0 valid?
>
> Q: what meaning is attached to altitude type 0?
>
> Q: what is the impact of having no altitude on the existing datum
> definitions?
>
> --
> Ticket URL: <http://trac.tools.ietf.org/wg/geopriv/trac/ticket/8>
> geopriv <http://tools.ietf.org/geopriv/>
>
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