Abstract: Energy co-simulation can be used to analyze the dynamic energy consumption of a building
or a region, which is essential for decision making in the planning and management of smart cities. To
increase the accessibility of energy simulation results, a dynamic online 3D city model visualization
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framework based on 3D Tiles is proposed in this paper. Two types of styling methods are studied,
attribute-based and ID map-based. We first perform the energy co-simulation and save the results in
CityGML format with EnergyADE. Then the 3D geometry data of these city objects are combined
with its simulation results as attributes or just with object ID information to generate Batched 3D
Models (B3DM) in 3D Tiles. Next, styling strategies are pre-defined and can be selected by end-users
to show di erent scenarios. Finally, during the visualization process, dynamic interactions and data
sources are integrated into the styling generation to support real-time visualization. This framework
is implemented with Cesium. Compared with existing dynamic online 3D visualization framework
such as directly styling or Cesium Language (CZML), a JSON format for describing a time-dynamic
graphical scene, primarily for display in a web browser running Cesium, the proposed framework is
more flexible and has higher performance in both data transmission and rendering which is essential
for real-time GIS applications.
Keywords: energy simulation; online 3D visualization; real-time; 3D tiles; dynamic styling
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