# 75. Mutation : générer de façon asynchrone « EquationMap »

## Aperçu

Générer "EquationMap" pour le "Field" de manière asynchrone.

{% hint style="info" %}
L'approche asynchrone place une tâche (Générer "`generateEquationMap`") à traiter et l'abonnement sera reçu dès que le traitement sera terminé.
{% endhint %}

## Couches de données prises en charge

Les EquationMaps peuvent être exécutés sur n'importe quelle couche de données disponible dans GeoPard, y compris l'imagerie satellitaire, les jeux de données pédologiques, les jeux de données de rendement, les jeux de données appliqués, la topographie, les cartes de zones, et même d'autres EquationMaps. Le format de `dataVariables` d'entrée variera en fonction de la couche de données sélectionnée.

```graphql
dataVariables: [
  # Jeu de données de rendement
  {
    variable: "yield_variable"
    yieldDatasetUuid: "<placeholder_of_yielddataset_uuid>"
    yieldAttribute: "<placeholder_of_yielddataset_attribute>"
  }, 
  
  # Jeu de données de sol
  {
    variable: "soil_variable"
    soilDatasetUuid: "<placeholder_of_soildataset_uuid>"
    soilAttribute: "<placeholder_of_soildataset_attribute>"
  },
  
  # Jeu de données appliqué (AsAppliedDataset)
  {
    variable: "asapplied_variable"
    asAppliedDatasetUuid: "<placeholder_of_asapplieddataset_uuid>"
    asAppliedAttribute: "<placeholder_of_asapplieddataset_attribute>"
  },
  
  # Image satellite
  {
    variable: "satelliteimage_variable"
    satelliteImageUuids: ["<placeholder_of_satelliteimage_uuid>"]
    index: "<placeholder_of_satelliteimage_vegetation_index>"
  },
  
  # Carte topographique
  {
    variable: "topography_variable"
    topographyMapUuid: "<placeholder_of_topographymap_uuid>"
    topographyAttribute: "<placeholder_of_topography_attribute>"
  },
  
  # EquationMap
  {
    variable: "equationmap_variable"
    equationMapUuid: "<placeholder_of_equationmap_uuid>"
  },
  
  # Carte des zones (VectorAnalysisMap)
  {
    variable: "zonesmap_variable"
    vectorAnalysisMapUuid: "<placeholder_of_zonesmap_uuid>"
  }
]
```

## Exemple

<pre class="language-graphql" data-overflow="wrap" data-line-numbers><code class="lang-graphql">mutation GenerateEquationMap {
  generateEquationMapAsync(input: {
    fieldUuid: "&#x3C;placeholder_of_field_uuid>"
    gridPixelSizeX: <a data-footnote-ref href="#user-content-fn-1">30</a>
    gridPixelSizeY: <a data-footnote-ref href="#user-content-fn-1">30</a>
    type: FERTILISATION
    equationAsText:"""calculated = yield_vol/prod + 0.5
si calculated >= 9 :
    resultat = 35
elif calculated >=5  et calculated &#x3C; 9 :
    resultat = 25
sinon :
    resultat = 15
    """
    equationResultVariable: "result"
    dataVariables: [{
      variable: "yield_vol"
      yieldDatasetUuid: "&#x3C;placeholder_of_yielddataset_uuid>"
      yieldAttribute: "Yld_Vol_We"
    }, {
      variable: "prod"
      yieldDatasetUuid: "&#x3C;placeholder_of_yielddataset_uuid>"
      yieldAttribute: "Prod_ac_h_"
    }]
  }) {
    uuid
    fieldUuid
    statusCode
  }
}
</code></pre>

[^1]: indiquez ici toute taille de pixel en mètres


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