Draft version ensemble contour map

content/3d-main-window/EnsembleContourMap.md

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+title = "Ensemble Contour Maps"
+weight = 40
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+
+![](/images/3d-main-window/ensemble-grid-contour-map.png)
+
+ResInsight can create contour maps from an ensemble of grid models based on different forms of aggregation of 3D Eclipse data onto a 2D plane.
+
+## Creating Contour Maps
+
+Import grid models using the **Create Grid Case Ensemble**. The grid models can have individually specified geometry. For grids with equal geometry, consider using [Grid Case Group]({{% relref "casegroupsandstatistics" %}}). The formation information is imported for each grid.
+
+![](/images/3d-main-window/import-grid-case-ensemble.png)
+
+Select "New Statistics Contour Map" from the right-click menu on the grid ensemble.
+
+## Properties of the Contour Maps
+
+![](/images/3d-main-window/statistics-contour-map-properties.png)
+
+The **General** group is used to define how to compute the contour map. See [Contour Map]({{% relref "contourmaps" %}}) for details.
+
+The grid case model defined by *"Primary Case"* is used for fault and simulation well visualization. The 2D area used to evaluate the contour map values is based on the bounding box of the **Primary Case**. Use **Bounding Box Expansion** to ensure that the area covers the geometry variation within the ensemble.
+
+### Time Step Selection
+
+Select the time steps to compute the contour map for.
+
+### Formation Selection
+
+Select the formations to compute the contour map for.
+
+### Result Definition
+
+Select the property to compute the contour map for.
+
+## Performance Considerations
+
+When working with multiple grid models, importing and processing data will take time. Understand how to limit the data involved in calculations, and consider a test run with a small number of realizations before using the full ensemble.
+
+As the grid geometry can be defined individually, grid cell geometry needs to be imported for each case. To ensure the import of only required geometry, use the **opm-common (beta)** grid reader and make sure to import only active cell geometry, as configured in [Preferences]({{% relref "performancehints" %}}).
+
+Consider setting the **Sampling Resolution** to coarse to improve performance. Note that this option will introduce interpolation effects.
+
+Click the **Compute** button in the **Property Editor** to start the computation.
+
+## Display of Contour Map Data
+
+A view is automatically created and displayed when the computation is completed. Select the **Map Projection** object to control the display. Create additional views from the right-click menu of the **Statistics Contour Map** object.
+
+![](/images/3d-main-window/ensemble-grid-map-projection.png)
+
+Select the current statistical property from **Statistics Type**. A value filter can be used to filter the display of the contour map.
+
+## Create Polygon
+
+Select "*Create Polygon from Contour Map*" from the right-click menu. This will create a polygon of the outline of the contour map. The shape of the polygon can be simplified using the right-click menu of the generated polygon.
+
+### References
+
+[Contour Map]({{% relref "contourmaps" %}})
+
+[Grid Case Group]({{% relref "casegroupsandstatistics" %}})