[georss] elevation and Simple<->GeoRSS GML interop questions

[Chris Beaudette]

1. I don't see an elevation spec for GeoRSS GML in gmlgeorssXX.xsd, but
there's one for Simple in georssXX.xsd (<georss:elev>).  Looking through
the user forums at
http://lists.eogeo.org/pipermail/georss/2007-January/000936.html I see
that it is necessary to use the "dimension" attribute for the
<gml:pos[List]> tag, e.g. 

 

<gml:LineString>

   <gml:posList dimension="3">0.0 0.0 1000.0 ...</gml:posList>
</gml:LineString>

 

Where the '1000.0' is the elevation.  

 

- Is this correct for gmlgeorss12.xsd?  I don't see the 'dimension'
attribute in there. I see only 'srsDimension'.

- If this is the correct use of 'dimension', what units are they in?
Does it depend on the 'srsName' used?  Does 'dimension' only work when
using a 'compound CRS'? Or are a compound CRS and 'dimension' not used
together?

- Would we ever still have occasion to use both GeoRSS GML and Simple
together, like this (from
http://lists.eogeo.org/pipermail/georss/2008-April/001848.html)...

  <georss:where>

    <gml:point>

      <gml:pos>blah blah</gml:pos>

    </gml:point>

  </georss:where>

  <georss:elev>313</georss:elev>

 

... assuming the <georss:elev> tag is at the same level as the
<georss:where> tag, or this if it is not:

  <georss:where>

    <gml:point>

      <gml:pos>blah blah</gml:pos>

    </gml:point>

    <georss:elev>313</georss:elev>

  </georss:where>

 

 

2. For an application to use the XML components only of the GeoRSS GML
spec w/o Atom (and the requisite <entry> tag), would it be possible to
use the <gml:...> elements without the <georss:where> tag?  Or is
<georss:where> required even when not using Atom/<entry>? 

 

 

3. As a follow-up to #s 1 & 2, I see the whereType defined in
georssXX.xsd, but not in gmlgeorssXX.xsd. Is it necessary to use both
schemas when using GeoRSS GML structures only (and no Simple features)?
Or is that only necessary when using the <georss:elev> tag w/ GeoRSS
GML?

 

_____________________

Chris Beaudette

Windsor Solutions, Inc.

www.windsorsolutions.com

503.675.7833  ext. 232

 

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