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OpenStreetMap
Le Modèle de Données
Un modèle évolutif
Simple
Possibilité de modifications ultérieures
Possibilité d'enrichissement continu
  <!ELEMENT osm (user|preferences|gpx_file|api|changeset|(node|way|relation)
  +)>
  <!ATTLIST osm version      CDATA #FIXED "0.6">
  <!ATTLIST osm generator     CDATA #IMPLIED>

  <!--response to request message api/0.6/user/details -->
  <!ELEMENT user (home?)>
  <!ATTLIST user display_name     CDATA #REQUIRED>
  <!ATTLIST user account_created CDATA #REQUIRED>

  <!ELEMENT home EMPTY>
  <!ATTLIST home lat    CDATA #REQUIRED>
  <!ATTLIST home lon    CDATA #REQUIRED>
  <!ATTLIST home zoom     CDATA #REQUIRED>
Point (node)


         NODE
* id (entier unique)
- user (nom)
- timestamp (date)
- version (entier)
- lon (longitude ° WGS84)
- lat (latitude ° WGS84)
Chemin (way)
                                                                   n1
                                             n0
                                                                        n3
                                                    n2
        WAY                           NODE
* id (entier unique)          nt
                       C ontie é}   * id
                                                         n4
- user (nom)                   n
                       {o rdon      ….
- timestamp (date)
- version (entier)                                {n0,n1,n2,n3,n4}
                                                              n1             n2
                                             n0
                                                                        n3



                                                         n4

                                                  {n0,n1,n2,n3,n4,n0}
Relation
                         ELEMENT
                                                                       Sert à associer des
                                                                        éléments :
                   ôle




                                                                       Dans une liste
         avec un r
              }




                                                                        ordonnée
     {ordonné




                                                                       Chaque élément
Contient




                                                                        possède un rôle
RELATION                                   WAY                    NODE
* id                               * id (entier unique)       nt* id
- user                             - user (nom)           ntie é}
                                                        Co nn ….
                                                           o
- timestamp                        - timestamp (date) {ord
-version                           - version (entier)
Les étiquettes (tag)
Chaque élément peut être caractérisé par des
 tags (paires clé/valeur)
Pour être homogène, une seule référence :
 le wiki
Des données facilement
                            exploitables
  Format XML pour les échanges (exports, API,
   etc.)
<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="CGImap 0.0.2">
 <bounds minlat="54.0889580" minlon="12.2487570" maxlat="54.0913900" maxlon="12.2524800"/>
 <node id="298884269" lat="54.0901746" lon="12.2482632" user="SvenHRO" uid="46882" visible="true" version="1" changeset="676636"
timestamp="2008-09-21T21:37:45Z"/>
 <node id="261728686" lat="54.0906309" lon="12.2441924" user="PikoWinter" uid="36744" visible="true" version="1" changeset="323878"
timestamp="2008-05-03T13:39:23Z"/>
 ...
 <node id="298884272" lat="54.0901447" lon="12.2516513" user="SvenHRO" uid="46882" visible="true" version="1" changeset="676636"
timestamp="2008-09-21T21:37:45Z"/>
 <way id="26659127" user="Masch" uid="55988" visible="true" version="5" changeset="4142606" timestamp="2010-03-16T11:47:08Z">
  <nd ref="292403538"/>
  <nd ref="298884289"/>
  ...
  <nd ref="261728686"/>
  <tag k="highway" v="unclassified"/>
  <tag k="name" v="Pastower Straße"/>
 </way>
 <relation id="56688" user="kmvar" uid="56190" visible="true" version="28" changeset="6947637" timestamp="2011-01-12T14:23:49Z">
  <member type="node" ref="294942404" role=""/>
  ...
  <member type="node" ref="364933006" role=""/>
  <member type="way" ref="4579143" role=""/>
  ...
  <member type="node" ref="249673494" role=""/>
  <tag k="name" v="Küstenbus Linie 123"/>
  <tag k="network" v="VVW"/>
  <tag k="operator" v="Regionalverkehr Küste"/>
  <tag k="ref" v="123"/>
  <tag k="route" v="bus"/>
  <tag k="type" v="route"/>
 </relation>
 ...
</osm>
Une constellation de services

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Le modèle de données

  • 2. Un modèle évolutif Simple Possibilité de modifications ultérieures Possibilité d'enrichissement continu <!ELEMENT osm (user|preferences|gpx_file|api|changeset|(node|way|relation) +)> <!ATTLIST osm version CDATA #FIXED "0.6"> <!ATTLIST osm generator CDATA #IMPLIED> <!--response to request message api/0.6/user/details --> <!ELEMENT user (home?)> <!ATTLIST user display_name CDATA #REQUIRED> <!ATTLIST user account_created CDATA #REQUIRED> <!ELEMENT home EMPTY> <!ATTLIST home lat CDATA #REQUIRED> <!ATTLIST home lon CDATA #REQUIRED> <!ATTLIST home zoom CDATA #REQUIRED>
  • 3. Point (node) NODE * id (entier unique) - user (nom) - timestamp (date) - version (entier) - lon (longitude ° WGS84) - lat (latitude ° WGS84)
  • 4. Chemin (way) n1 n0 n3 n2 WAY NODE * id (entier unique) nt C ontie é} * id n4 - user (nom) n {o rdon …. - timestamp (date) - version (entier) {n0,n1,n2,n3,n4} n1 n2 n0 n3 n4 {n0,n1,n2,n3,n4,n0}
  • 5. Relation ELEMENT Sert à associer des éléments : ôle Dans une liste avec un r } ordonnée {ordonné Chaque élément Contient possède un rôle RELATION WAY NODE * id * id (entier unique) nt* id - user - user (nom) ntie é} Co nn …. o - timestamp - timestamp (date) {ord -version - version (entier)
  • 6. Les étiquettes (tag) Chaque élément peut être caractérisé par des tags (paires clé/valeur) Pour être homogène, une seule référence : le wiki
  • 7. Des données facilement exploitables Format XML pour les échanges (exports, API, etc.) <?xml version="1.0" encoding="UTF-8"?> <osm version="0.6" generator="CGImap 0.0.2"> <bounds minlat="54.0889580" minlon="12.2487570" maxlat="54.0913900" maxlon="12.2524800"/> <node id="298884269" lat="54.0901746" lon="12.2482632" user="SvenHRO" uid="46882" visible="true" version="1" changeset="676636" timestamp="2008-09-21T21:37:45Z"/> <node id="261728686" lat="54.0906309" lon="12.2441924" user="PikoWinter" uid="36744" visible="true" version="1" changeset="323878" timestamp="2008-05-03T13:39:23Z"/> ... <node id="298884272" lat="54.0901447" lon="12.2516513" user="SvenHRO" uid="46882" visible="true" version="1" changeset="676636" timestamp="2008-09-21T21:37:45Z"/> <way id="26659127" user="Masch" uid="55988" visible="true" version="5" changeset="4142606" timestamp="2010-03-16T11:47:08Z"> <nd ref="292403538"/> <nd ref="298884289"/> ... <nd ref="261728686"/> <tag k="highway" v="unclassified"/> <tag k="name" v="Pastower Straße"/> </way> <relation id="56688" user="kmvar" uid="56190" visible="true" version="28" changeset="6947637" timestamp="2011-01-12T14:23:49Z"> <member type="node" ref="294942404" role=""/> ... <member type="node" ref="364933006" role=""/> <member type="way" ref="4579143" role=""/> ... <member type="node" ref="249673494" role=""/> <tag k="name" v="Küstenbus Linie 123"/> <tag k="network" v="VVW"/> <tag k="operator" v="Regionalverkehr Küste"/> <tag k="ref" v="123"/> <tag k="route" v="bus"/> <tag k="type" v="route"/> </relation> ... </osm>