# SINDVis: User-Centered Dynamic Interactive Visualization System for Space Information Networks
## 4 Results
### GeoView Implementation
#### 4.1.2 GeoView Function Implementation  
As described in Section 3.2.1, we used the LEO satellite system as an example to determine the whole function of the system. It was assumed that the LEO satellite system consists of five LEO satellites and one ground station. The GeoView not only supports a 3D view display, but also supports 2.5D and 2D view modes, and users can switch between pages. Figure 11(a) shows the specific network form of the LEO satellite system from the ground station point, and the purple curve in the diagram shows the orbit of the satellite in the information system. When the satellite is operating in an effective range with the ground station, the satellite is connected with the station and the data is transmitted, as shown in the cyan line in Figure 11(b). Figure 11(c) shows the 2.5D view, and Figure 11(d) shows the 2D view, in which the purple curve is the orbit of the satellite. Based on LEO satellite information system, an MEO/LEO satellite system based on MEO/LEO constellation can be realized by increasing the MEO constellation. In this section, six MEO satellites were added to construct the MEO/LEO satellite information system based on the LEO satellite information system, as shown in Figure 12.  
As shown in Figure 12, the green curve is the orbit of the MEO satellite in Figure 12(a), and it shows the satellite layout and the specific distribution of the MEO constellation. When the MEO satellites and LEO satellites run into a valid range, they are connected to each other for data transmission. The green line in Figure 12(b) shows that the MEO satellite and LEO satellite are transmitting data. Based on the above-mentioned system, we built the integral satellite information system by adding the GEO satellite information system. By considering the characteristics of GEO satellites, we used three GEO satellites, evenly distributed in the GEO orbit, to establish full coverage of the GEO satellite information system, as shown in Figure 13.  
In Figure 14, the yellow curve is the orbit of the GEO satellite, and Figure 14a,b show the connections between the GEO satellites and the data transmission status of GEO-2 and the ground station named BS. The purple line in the diagram is the transmission link. Thus, now, we have established the satellite information system of the SIN. Compared to the four-story structure of the Near Space layer, due to its particular structure and location and the page range limitation of the SINDVis system, the specific network situation is not clear in the overall view of Near Space. Figure 12: The view display of the LEO satellite information system: (**a**) The specific network form of the LEO satellite system from the ground station point; (**b**) the satellite is connected with the station and the data is transmitting; (**c**) 2.5D view of the LEO satellite information system; (**d**) 2D view of the LEO satellite information system. Figure 13: The 3D view display of the MEO/LEO satellite information system: (**a**) The satellite layout and the specific distribution of the MEO constellation; (**b**) the MEO satellite and LEO satellite are transmitting data. Next, we use the HABs as an example to display the concrete network of the Near Space layer information system. For terrain complex areas, people can only rely on the Hab group to complete the task. Therefore, we chose the terrain complex mountainous area as the background environment, with 12 HABs forming a group, as shown in Figure 15.  
As shown in Figure 15, by loading the balloon model in the Cesium library, a balloon swarm is constructed with 12 balloons. We selected the balloon surrounded in the green box as a data transmission center that can connect with the ground station and 11 other balloons. To sum up, combining the architecture of SIN and the function of view in GeoView in the entity domain, we constructed the GeoView.