Fig 1.
Distribution map of fort-type settlements in Shaanxi.
Fig 2.
Research framework diagram.
Table 1.
Quantitative index factors.
Fig 3.
Clustering analysis line chart.
Fig 4.
Clustering analysis scatters plot.
Table 2.
Analysis of the average nearest neighbor of the different cluster systems.
Fig 5.
Nearest neighbor index analysis chart.
Fig 6.
Kernel density estimation map.
Fig 7.
Cluster distribution map.
Fig 8.
Group system distribution map.
Fig 9.
Correlation analysis.
Fig 10.
Type factors statistical chart.
Fig 11.
Distribution map of different construction forces.
Fig 12.
Scope of the war conflict.
Fig 13.
The chronological trend of fort-type settlements.
Fig 14.
Analysis of elevation.
Fig 15.
Analysis of slope.
Fig 16.
Analysis of slope direction.
Fig 17.
Line density map.
Fig 18.
Influencing factors action process.
Table 3.
Characteristics of cluster systems classification.