This repo is based on ST-RTA, but analyze with QGIS and R, analyze goal including:

• Mapper Algorithm: Identify high-risk road segments and intersections for traffic accidents in Taiwan, and integrate SNA with TDA for reveal main hotspot factor.

• Spatial Analysis: Explore spatial patterns and trends of traffic accidents in Taiwan using various spatial analysis techniques.

taiwan-latest-free : Data downloaded from OpenStreetMap, with road network, which will be use in future, and also infrastructures, landuse, etc. county, city, village : downloaded from nlsc, with counties, city, and village boundaries.

• QGIS Tutorials and Tips
• GeoTech Center Model Courses

This repo includes the following folders:

• Analyze/Entropy: Entropy analysis for traffic accident data.

• Analyze/Mapper: Topological Data Analysis (TDA) Mapper algorithm analysis for traffic accident data.

• Analyze/SNA: Social Network Analysis (SNA) for traffic accident data based on Mapper Algorithm.

• Analyze/SpeedDifference: Calculate speed difference for traffic accident data based on the road network.

KDE:

• Analyze/KDE: Kernel Density Estimation (KDE) for traffic accident data. - Analyze/WKDE: Weighted Kernel Density Estimation (KDE) for traffic accident data. - Analyze/NKDE: Network-based Kernel Density Estimation (KDE) for traffic accident data.