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.