# An ARCore-Based Augmented Reality Campus Navigation System
## 5 System Test and Result Analysis
### Indoor Library Floor Map Test  
The library was selected as the indoor test site. In the daily campus life, the library is a frequent place for students to study and to examine literature. Before looking up the books, students often need to enter the title of the book in front of the library search system and to obtain the index number. They then proceed to the floor where the book is located and perform a search according to the shelf number. This process is not only cumbersome but also inefficient in query. Through the augmented reality navigation system, the specific storage location of the books to be borrowed can be found more intuitively and quickly. When the user arrives at the location of the library through path planning, the system will automatically switch between outdoor and indoor maps, and what is presented is a 3D indoor flat map of the library. The location of each book area is clearly listed on the map. As shown in Figure 9a, it is easier to enter the starting location and destination area in the dialog box, and the \"Navigation\" button is clicked in order to start route planning. The system will accurately mark the user's current location on the 3D map according to the entered starting place, and the red ball is used in order to locate it. At the same time, a red path will be displayed, which represents the best path from the starting point to the destination as shown in Figure 9b. Before navigating, an initial synchronization is also required in order to synchronize the initial position of the device camera with the position of the sphere on the map. It is also important to first place the sphere in the position and direction of the navigation and to navigate according to the planned route. When arriving at the corresponding area, the navigation system will automatically pop up a book query dialog box, as shown in Figure 9c. The book query function is connected to the school's  
Figure 8: Interface collections of the proposed system (**a–d**) and Gaode AR system (**e–h**) in outdoor navigation. (**a**) Outdoor navigation initialization interface of the proposed system. (**b**) Navigation information input interface of the proposed system. (**c**) Navigation interface after route planning of the proposed system. (**d**) Augmented reality information of the proposed system after arriving at the destination. (**e**) Outdoor navigation initialization interface of Gaode map after input the destination. (**f**) Navigation interface after route planning of Gaode map. (**g**) The terminal mark of Gaode map. (**h**) Comparison of the terminal mark with the real destination directed by red arrow. book database. When the user enters the title of a book and clicks on the query, the system calls the database to query the specific location of the book as the title of a book is typed. After the system recalls book information, basic introduction and location information of the book will be displayed on the screen of the mobile phone, as shown in Figure 9d. The user can quickly locate the location of the book in combination with 3D text. At the end of this navigation, the \"route planning\" button is clicked again to start the next round of regional navigations in the library. The proposed system shows great scalability and flexibility for indoor navigation. As long as there are clear 2D plans of other libraries, the library navigation of different schools can be realized by replacing the mapping shader. There are great advantages in integrating indoor and outdoor campus navigation in ARCore as shown in Figures 8 and 9. Compared with Gaode and other navigational software, the advantage of the app is that it takes the predefined indoor map as reference and realizes the indoor navigation accurately. It also solves situations in which GPS cannot be applied in the indoor navigation. In order to further compare with the previous AR navigation, the system shows powerful features in various scenarios, such as the location of large regional venues, exhibition stalls and so on.