geo-extension-waypoints-fr

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Geo Waypoint Trails

Une exploration de publier de l'information de séquences de points géographiques en utilisant une série de microformats Geo (ou autres).

Définitions

Conceptually, a collection of points, with no sequential relationship (the county towns of England, say, or all skyscrapers in New York), is deemed a collection (or set) of individual Waypoints. A sequentially-ordered collection of points may be expressed as a track or a route. Tracks are a record of where a person has been, routes are suggestions about where they might go in the future. So, for instance, there might be timestamps for each point in a track (because someone is recording where and when they were there), but timestamps for each point in a route are unlikely to be provided, because the author is suggesting it, and nobody might ever have travelled it.

A route which ends at its beginning may also describe a boundary (also called a box or polygon). A boundary may be for an object or area on any scale, from a small building or plot of land to a continent, at any level of granularity.

It may therefore be appropriate to use a sequence of hCalendar microformats for tracks and of hCard microformats for routes, boundaries and waypoints.

Le Problème

To allow the publishing of series of waypoints in such a way that they are downloadable and that their ordering is parsable.

Participants

Exemples du Vrai Monde

Collections

  <tr>
  <td>10</td>
  <td>
    <div class="geo">
      <span class="latitude">52.38616</span><br/>
      <span class="longitude">4.91199</span>
    </div>
  </td>
  <td ><a href="...">Waypoint 10</a></td>
  <td >Amsterdam (3 km) <a title="" href="...">Map</a></td>
  </tr>

Autre

  <wpt lat="39.921055008" lon="3.054223107"> 
  <ele>12.863281</ele> 
  <time>2005-05-16T11:49:06Z</time> 
  <name>Cala Sant Vicenç - Mallorca</name> 
  <sym>City</sym> 
  </wpt>

Attributs obligatoires typiques

  • Latitude (WSG84, using decimal or degrees-minutes-seconds values)
  • Longitude (ditto)
  • text label

Attributs optionnels typiques

  • timestamp
  • elevation
  • image
  • note ?
  • url ?

Problématiques

  • How to indicate that a set of waypoints is a specific, but unordered, collection (u.e. a set of all the metro stations in Paris, and another set of all the underground stations in London, may be published on the same page)
  • How to sequence routes
    • Perhaps using order in source code, ordered lists, or hAtom?
  • How to timestamp tracks (timestamps imply a chronological sequence)
  • How to differentiate between a route (for example in the shape of a letter "U") and a boundary - in other words, to say whether or not, after the last point, the line returns to the first.
  • What can we learn, or use, from the GPX (XML schema for GPS data) specification?

Références

Voir aussi

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