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The WHEN statement compares the trajectory segment’s start and end times to the current TimeManager animation time. For the plugins: Select the Plug-ins entry. Now you have to add to the Gimp Folders paths. The second geometry generator expression interpolates the position on the segment that contains the current TimeManager animation time: Unzip the zip (In Windows, click on the zip to open it) That gives a folder GAP27. The first geometry generator expression splits the trajectory in its segments: To do that, we interpolate the position along the trajectory segments. Once TimeManager is set up, we can edit the line style to add a point marker to visualize the position of the moving object at the current animation timestamp. TimeManager exposes an animation_datetime() function which returns the current animation timestamp, that is, the timestamp that is also displayed in the TimeManager dock, as well as on the map (if we don’t explicitly disable this option). The layer is added to TimeManager using t_start and t_end attributes to define the trajectory’s temporal extent. (In part 2 of this series, we already saw how a geometry generator can be used to visualize speed along a trajectory.) So there is only one line feature loaded in QGIS: roku space screensaver easter eggs 2021 On spark plug gap simonis x1 review e. What makes this approach interesting is that the trajectory is stored in PostGIS as a LinestringM instead of storing individual trajectory points. This is another example of what is possible thanks to QGIS’ geometry generator feature. In this post, we use TimeManager to visualize the position of a moving object over time along a trajectory.