...
When annotations have different content for either the annotation itself text (valueColumn) or any of the properties (propertyColumn), they are considered unique annotations and will exist next to eachother (this is solved in the background of FEWS by shifting newer annotations by milliseconds).
When an annotation is imported with the exact same location-time combination and identical contents of the annotation text (valueColumn) and all properties (propertyColumn) for an already existing annotation, then it is checked whether the start and or end time has changed and if so, they are updated . But when the start and end time are also the same the "new" annotation is considered the same and is ignored.any potential changes in other columns are ignored and the annotation will not be imported.
Example: Import of Meteosat images as time-series
...