Time Series Modifiers

This display is used to apply changes to time series within the FEWS database. the definition of modification to a time series is that a change is made to that time series without actually editing the values themselves. The changes are established as a "description of the change". This could be for example the increase of an observed level by 2 cm over a given time period. It could also be applied as an edited time series to replace the original time series. On retrieval of a time series from the database, the data access layer checks if there are any modifiers applicable to the data being extracted. If relevant modifiers are found, then these are applied before the data is passed to the module that has requested the data. The module itself is not "aware" that the data has been amended by a modifiers. The diagram below illustrates this process.

Modifiers can be entered and managed through the Time Series Modifier Display.

Time Series Modifier Display
Modifiers are defined through the modifier display, which can be opened either through the FEWS explorer menu, or through the toolbar on the main window (when configured).

The modifier display contains five sections;
• A tree view of the pre-configured display groups containing links to time series to which modifiers can be applied.
• A panel allowing the user to select the specific location to which a modifier is to be applied.
• A panel allowing the user to select the specific parameter to which a modifier is to be applied.
• A main window showing time series contained in the display group selected.
• An information panel allowing new modifiers to be defined, and existing modifiers to be managed.