Global Digital Twin for Florence by Snap4City, 3D city view

Please note that in Snap4City Global and Local Digital Twins are integrated with IOT models, maps, heatlamps, etc.

Snap4City provides support for creating enhanced Global Digital Twin intgrated with Local Digital Twins, it is part of the Dashboard Builder of Snap4City which is 100% open source. The Global digital twin representing the 3D shape of the city that can be very detailed as in the Local Digital Twin or simplified in shape and volumes. The new Digital Twin 3D view in Snap4City is now able to manage multiple layers on the map with different levels of opacity. Also heatmaps can be added in the 3D view since they are shown integrated in the Digital Twin. POI markers are also integrated in the 3D view with the possibility to see the detailed popup by clicking the corresponding POI marker on the map. The following dashboard shown an example of a 3D representation of the City of Florence, with POIs, heatmaps and geometries that can be activated/deactivated by clicking the corresponding item in the selector widget on the left.

The visualization of the Point of interests’ icons on the map can be activated by selecting the corresponding icon item in the selector widget on the left. By clicking a POI in the map, a pop up is open showing the information related to the selected service. If real time values are available, they are shown on the pop up and trends and last data can be connected and shown on external widgets in the same dashboard.

Please note that in Snap4City Global and Local Digital Twins are integrated with IOT models, maps, heatlamps, etc.:

Digital Twin (local and global): Snap4City view

Control Buttons

On the top left corner of the map there is a drop-down list, where you can choose the basic orthomaps and the type of buildings you want to show. It is also possible to select the type of map to be displaied, 3D or 2D.

In the 3D visualization of the map some small buttons are available on the top left allowing to manage visualization parameters like the zoom, the rotation and inclination of the map.Also the visualizaztion of the 3D view can be governed by using the mouse, the mouse wheel to change the zoom level, and by pressing the Shift key with the left button of the mouse to modify the rotation and inclination of the 3D map. Right buttons and wheel can provide shorcut controls for fluid movements of 3D scene.

In addition, it is also possible to activate the lighting effect by clicking the "L" button always at the top left. Once the effect has been activated, a field for the date and time for the light effect also appears (illuminating the scene according to the light of Sun in different moments of the day), active by default with date and time of the current day.

Depending on the selected data, you can also have other controls on the map, for example once a heatmap has been activated, you will have another control at the top right that will allow you to manage the opacity of the chosen heatmap (default 0.25) and also select the desired date, using the "next" and "prev" buttons.


[DigitalTwin1] L. Adreani, P. Bellini, C. Colombo, M. Fanfani, P. Nesi, G. Pantaleo, R. Pisanu, "Digital Twin Framework for Smart City Solutions", DMSVIVA 2022, The 28th International DMS Conference on Visualization and Visual Languages, KSIR Virtual Conference Center, Pittsburgh, USA, June 29 - 30, 2022,, Best Paper Award

[DigitalTwin2] L. Adreani, C. Colombo, M. Fanfani, P. Nesi, G. Pantaleo, R. Pisanu, "Rendering 3D City for Smart City Digital Twin", IEEE SMARTCOMP, June 2022, Aalto University, Espoo, Finland.