View source for Result type (Watershed Overlay)

The [[Watershed Module]] of a [[Watershed Overlay]] performs complex calculations and multiple types of results can be provided.
==Unique results==
Each result type represents an aspect of the calculated watershed simulation, and is accompanied by its own [[Grid Overlay legend|legend]]. As can be seen in the list below, many result types are supported. The watershed module can record more than one result type. However, since not all result types can be stored at the same time, only the selected ones are recorded. These results will be stored in individual overlays. 

There is always one general Watershed Overlay. The configuration for the calculation is only defined in this overlay, which makes it easier to verify and configure the used simulation parameters. Result child overlays can be added to this Watershed Overlay to store additional result types. The advantage of using result child overlays are that for any given watershed overlay, the calculation of the overlay only occurs once, rather than multiple times equal to the amount of desired result types. 

It is currently only possible to add result child overlays via the [[Watershed Overlay Wizard|configuration wizard]], in the step regarding output overlays.

Naturally, the results can be [[Results (Watershed Overlay)#Overlay_visualization|seen visually]]. They can also be [[Results (Watershed Overlay)#Inspecting_results|inspected]] in more detail, and also [[How to export a Grid Overlay as GeoTIFF|exported as a GeoTiff]].

==Changing a result type==
When the result type of the Watershed Overlay or any of its children, is changed, the legend is updated automatically. However, the data for this new result type must still be calculated. This may result in the visual output of the overlay changing, because the unchanged data is displayed with a new legend. When changing the result types, it is recommended to force a recalculation of the overlay before inspecting the results.

==List of Result Types==
{{result types|suppresscategory=true|allowselflinks=true|
  {{:Base types result type (Watershed Overlay)}}
  {{:Direction result type (Watershed Overlay)}}
  {{:Discharge areas result type (Watershed Overlay)}}
  {{:Watersheds result type (Watershed Overlay)}}
}}

==Notes==
* Although it is possible to duplicate the overlay, and set the copy of the overlay to a different result type, we strongly advice to use child overlays instead. Downsides of the duplication approach are: 
# the simulation has to run in full multiple times, causing a severe increase in calculation time.
# when changes to the overlay's configuration have to be made those changes need to be made to all water overlays.
* Result child overlays are not (re)calculated if either they or their parent is set to [[Grid Overlay#Active|inactive]].
* If a calculation overlay is removed, all result child overlays of that overlay are removed as well. Separate overlays set as child overlays (such as [[input overlay]]s) of the overlay will not be removed.

==How-to's==
* [[How to add and remove a Result type]]

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[[Category:Watershed Module]]