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The t0 can be set to the selected time in the time slider by the button  "Set t0 to the selected time". If a location is not visible at the selected time in the time slider, the location will still be shown in the map and the filter, but will be greyed out to indicate that it is not valid at the selected time. For performance reasons the icons in the filters will not be updated according to the selected time when the time slider is shown in the map display. The MapToolTip (button "tooltip") and MapItemSelectTool (button "select locations with lasso tool") take into account the selected time in time slider. If the time slider is not selected the system time is used.

In typical WIS systems users still want to have access to the data although the locations has been "stopped" by the provided stoptime. Therefore, the option <showLocationsOutsideVisibilityPeriod>true</showLocationsOutsideVisibilityPeriod> can be defined in Explorer.xml to show all locations no matter the start-/stoptime in de Filters. Locations outside of the defined start-/stoptime will be marked using black/gray crosses instead of the typical red/darkred ones for missing data.

Filter change events

Since 2016.02 a filter button has been added which lets the user choose which change events should be included. The change events are grouped by type of change events recognized in Delft-FEWS: Map Layers, Locations, Location Attributes, Location Relations;