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When a user double clicks on a spot in a shape in the grid display, the plots dialog will automatically open and the time series of the selected polygon will be shown. But with the introduction of time dependent locations it is possible that the polygon which overlaps a selected geographical point varies over time. If this is the case and the user double clicks on a spot where the overlap in time occurs, the time series shown in the plots display will also vary over time, so multiple time series will be visible for the total period.” The MapToolTip (button "tooltip") also takes into account that locations and the related polygons can vary over time.

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By default the map display and filters will not take into account that the locations shown are time dependent but show the situation as it is at the display time. In the explorer.xml it is possible to configure that the map display shows a time slider when locations are shown on the map which are time dependent. Activating the time slider should be considered as going into a sort of special mode which allows to view how locations were configured in the past.

Code Block
xml
xml
		<locationHistoryBarRelativePeriod unit="week" start="-100" end="100"/>

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The time slider will show a time mark for each time there was a change for a location (in the view period were a location shown in the display changes). The default view period will be the period configured in the explorer.xml. The view period can be changed by selecting the button "Period history time slider" (button with the clock and arrows).

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. Activating the time slider

should be considered as going into a sort of special mode which allows to view how locations were configured in the past.

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.

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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):;

Together with the context menu option for location filter "Show Config Diff for Selected Time" (see screenshot below) it will show a clear overview of only the locations that have changed on that time step:

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Time dependent map layers

The map layers can be configured in the SystemConfigFiles/Explorer.xml file.The map layers in the map display can be made time dependent in the same way as the map layers in the grid display .(configuration in the SystemConfigFiles/Explorer.xml file). The example in the section Grid display shows how this can be done.

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The transformation module automatically takes into account the time dependency of the locations. No configuration is needed in the transformation module. If an end time is introduced for a location and time series are in the database for this location after the end time, then the part of the time series which is not valid anymore will not be read from the database. The benefit of this approach is that the configurator doesn't need to remove obsolete parts of time series for the location from the database. Note: the usage of time dependent location relations is not supported in the transformation module because this requires to switch the location itself during the transformation.

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