## 4 Bibliometric Analysis
### Science Mapping Analysis
#### 4.3.1 Co-Citation Analysis
Meanwhile, _Proceedings CVPR IEEE_ has the second-highest total link strength in the red cluster with 8626. The green cluster is composed of nine sources. The most influential source in the cluster is _Computer-Aided Civil and Infrastructure Engineering_ with 19 links and a total link strength of 10,694. The journal is related to _IEEE Transactions on Intelligent Transportation Systems_ with 134 citations and _Automation in Construction_ with 134 citations. _Automation in Construction_ is the second-most cited source in the green cluster with a total link strength of 8425. After analyzing the co-citation network of the cited sources, the authors analyzed the co-citation network of the cited authors. To filter the top 20 authors in terms of total link strength, the citation threshold is set to at least 46 citations. Table 8 shows the total co-citation link strength of the cited authors. The total link strength of the authors determines the order of this table. For better understanding, we have generated the scientific landscape of the cited authors' co-citation network using the VOSviewer 1.6.20 software, as shown in Figure 7.  
As can be seen in Figure 7, the cited authors are grouped into a total of three clusters (red, green, and blue). Each node represents the corresponding cited author: the larger the node, the higher the citation, and the thicker the line between two nodes, the stronger the link strength between the two cited authors. The total link strength is also chosen as the weight of the co-citation analysis, and the cited author with a higher citation has a higher link strength. The cited authors were cited together with the others cited author of the cluster in which they are located. Figure 6: Network visualization of co-citation analysis of the sources. The red cluster contains 9 authors. The lead author of this cluster is \"[PERSON], [PERSON]\" with a total link strength of 1118. This author has the highest number of citations with 157. The second author is \"[PERSON], [PERSON]\" with a total link strength of 888 and 138 citations. The third author is \"[PERSON], [PERSON]\" with a total link strength of 749 and 96 citations. \"[PERSON], [PERSON]\" and \"[PERSON], [PERSON]\" have 49 citations together. [PERSON]\" and \"[PERSON], [PERSON]\" are cited together 68 times, and \"[PERSON], [PERSON]\" and \"[PERSON], [PERSON]\" are cited together 33 times. \"This suggests a high degree of similarity in the focus of their research topics. There is a higher correlation \begin{table}
\begin{tabular}{c c c} \hline
**Cited Author** & **Citations** & **Total Link Strength** \\ \hline [PERSON] (zou, q) & 157 & 1118 \\ [PERSON] [PERSON] (zhang, a) & 138 & 888 \\ [PERSON] (cha, yj) & 124 & 875 \\ [PERSON] [PERSON] (shi, y) & 96 & 749 \\ [PERSON] (he, km) & 88 & 659 \\ [PERSON] (zhang, l) & 89 & 641 \\ [PERSON] (fan, z) & 75 & 584 \\ [PERSON] (oliveira, h) & 87 & 571 \\ [PERSON] (yang, f) & 74 & 567 \\ [PERSON], [PERSON] (ronneberger, o) & 74 & 560 \\ [PERSON], [PERSON] (long, j) & 56 & 498 \\ [PERSON] (amhaz, r) & 65 & 489 \\ [PERSON] (hoang, nd) & 78 & 438 \\ [PERSON] (badrinarayanan, v) & 51 & 426 \\ [PERSON] (li, qq) & 57 & 388 \\ [PERSON] (grishick, r) & 50 & 378 \\ [PERSON] (lin, ty) & 46 & 343 \\ [PERSON] (tong, z) & 60 & 316 \\ [PERSON], [PERSON] (redmon, j) & 48 & 306 \\ [PERSON] [PERSON] & 52 & 286 \\ (gopalakrishnan, k) & & \\ \hline \end{tabular}
\end{table} 
Table 8: Authors’ co-citation indices. Figure 7: Network visualization of co-citation analysis of the cited authors. between the authors of the red clusters than between the authors of the red clusters and the authors of the other color clusters. The green cluster has six authors. The most cited author in this cluster is \"[PERSON]\" with a total link strength of 875. This author has the highest link strength with \"[PERSON], [PERSON]\" with a value of 41 and also has a higher link strength with \"[PERSON], [PERSON]\" with a value of 37. Another influential author in this cluster is \"[PERSON]\" with a total link strength of 659.