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Cette couche n'a pas vocation à être utilisée pour identifier la PAU (Partie Actuellement à Urbaniser).
Description générale : La tâche urbaine a été réalisée selon la méthodologie du CERTU, en tenant compte de deux paramètres : la dilatation (D) et l'érosion (E).
Elle a été réalisée par le CETE du Sud-Ouest, de manière automatisée (mise au point d'un outil) à partir des couches de la BDTopo.
Utilisations potentielles : Etudes Générales</gco:CharacterString>
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                  <gco:CharacterString>GÉNÉALOGIE : Objectifs de production : Connaître l'artificialisation des sols.
Généalogie des données : Réalisée à partir de la BDTOPO, prise de vue aérienne variable suivant le département.
à partir des couches BATI_INDIFFERENCIE, BATI_REMARQUABLE, BATI_INDUSTRIEL, AIRE_TRIAGE, GARE, RESERVOIR_EAU, CIMETIERE, CONSTRUCTION_SURFACIQUE, TERRAIN_SPORT, PISTE_AERODROME, POSTE_TRANSFORMATION, SURFACE_ACTIVITE, SURFACE_ROUTE.
La réalisation des tâches urbaines repose sur le principe :
- de la création de tampon de la valeur 'Dilatation' autour de chaque objet,
- de l'assemblage de ces tampons
- puis on applique une réduction de la valeur 'Érosion'.
Comme la Dilatation = Érosion alors la tache urbaine tangente les objets en périphérie.
Toutes ces actions sont automatisées dans MapInfo à l'aide d'une routine MBX réalisée par le CETE du Sud-Ouest (Philippe Loriot)

L'érosion de 50m est celle proposée par la méthode CERTU et est celle utilisée en général. Cependant, dans certaines utilisations (identification de l'habitat dispersé en milieu rural), une érosion plus faible (20m) aurait semblé plus adaptée, mais n'a pas été réalisée.

Les données attributaires sont :
* le nombre de bâtiments par polygone
* la superficie du polygone, exprimée en m2
Ce champ superficie peut être utile pour filtrer les polygones les plus petits, moins significatifs dans le cadre de certaines études.

Une mise à jour de la tâche urbaine est prévue dès mise à jour de la BDTOPO selon la disponibilité et l'exploitation des prises de vue aérienne de l'IGN (BDORTHO), afin de pour comparer l'urbanisation à différente période.

Il faut noter qu'en limite départementale, il peut y avoir des effets de bord dûs à la non prise en compte des bâtiments des départements limitrophes.

 QUALITÉ DES DONNÉES : Qualité du Lot : Récapitulatif des paramètres utilisés :
La couche MapInfo correspond aux paramètres suivants :
. Dilatation : 50 mètres
. Érosion : -50 mètres

Échelle minimum d'utilisation : 1/25000
Échelle maximum d'utilisation : 1/5000
Fréquence de mise à jour : mise à jour prévue avec la BDTOPO maj/ PVA de chaque BDORTHO départementale</gco:CharacterString>
               </gmd:statement>
               <gmd:source>
                  <gmd:LI_Source>
                     <gmd:sourceCitation>
                        <gmd:CI_Citation>
                           <gmd:title>
                              <gco:CharacterString>DORDOGNE : BDTOPO (PVA 2005) GIRONDE : BDTOPO (PVA 2004) LANDES : BDTOPO (PVA 2006) LOT-ET-GARONNE : BDTOPO (PVA 2004) PYRENEES-ATLANTIQUES : BDTOPO (PVA 2002)</gco:CharacterString>
                           </gmd:title>
                           <gmd:date>
                              <gmd:CI_Date>
                                 <gmd:date>
                                    <gco:Date>2008-01-01</gco:Date>
                                 </gmd:date>
                                 <gmd:dateType>
                                    <gmd:CI_DateTypeCode codeListValue="revision"
                                                         codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/ML_gmxCodelists.xml#CI_DateTypeCode"/>
                                 </gmd:dateType>
                              </gmd:CI_Date>
                           </gmd:date>
                        </gmd:CI_Citation>
                     </gmd:sourceCitation>
                  </gmd:LI_Source>
               </gmd:source>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataConstraints>
      <gmd:MD_SecurityConstraints>
         <gmd:classification>
            <gmd:MD_ClassificationCode codeListValue="unclassified"
                                       codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/ML_gmxCodelists.xml#MD_ClassificationCode"/>
         </gmd:classification>
         <gmd:classificationSystem>
            <gco:CharacterString>ADELIE</gco:CharacterString>
         </gmd:classificationSystem>
      </gmd:MD_SecurityConstraints>
  </gmd:metadataConstraints>
</gmd:MD_Metadata>