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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 [http://en.wikipedia.org/wiki/Waypoint 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 ==
*[[User:AndyMabbett|Andy Mabbett]]

== Exemples du Vrai Monde ==

*[http://gpsnepal.com/waypoint.php?trek=everest Jiri to Everest Trek in Nepal]
**(or any other treks on that site)
**relevant mark-up: <code><nowiki><tr><td>Jiri Bus Park</td><td>27° 38.173'</td><td>86° 13.909'</td><td>1924</td></tr></nowiki></code> ("1924" is the elevation)
*http://members.aol.com/gpspage/waypoints.html
*[http://grothserver.princeton.edu/~groth/frs142s04/waypoint_hunt/waypoint_hunt.html Freshman Seminar Waypoint Hunt]
**relevant mark-up: <code><nowiki><tr><td>BENCH</td><td>40.33855</td><td>-74.66465</td><td><a href="bench.html"><img src="bench_c.gif" alt="[...]"></a></td></tr></nowiki></code>

===Collections===
*[http://www.poi66.com/ POI66]
**example: [http://www.poi66.com/maps/show_album?album=adelaarspad Amsterdam CS-Alkmaar CS walking route] (n.b long page; 612 waypoints)
**relevant mark-up: <s><code><nowiki><li><div>waypoint 10<br/>Latitude 52.386165<br/>Longitude 4.91199</div></li></nowiki></code></s>
<pre><nowiki>
<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>
</nowiki></pre>

===Autre===
* [http://www.topografix.com/gpx.asp GPX] - XML schema for trails
**[http://en.wikipedia.org/wiki/GPX GPX on Wikipedia]
**exemple (extrait) :
<pre><nowiki>
<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>
</nowiki></pre>

===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|hAtom]]?
*How to timestamp tracks (timestamps imply a chronological sequence)
**Perhaps using [[hcalendar|hCalendar]]?
*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==
*[http://dublincore.org/documents/dcmi-box/ DCMI Box Encoding Scheme]

== Voir aussi ==
{{geo-related-pages-fr}}

geo-extension-waypoints-fr - Revision history

ChristopheDucamp: à traduire