Fig. 6: Hierarchical clustering of adaptation-related topics in Henan.
From: The 2021 Henan flood increased citizen demand for government-led climate change adaptation in China
Dendrogram shows hierarchical agglomerative clustering of six topics derived from BERTopic analysis, using Ward’s method and cosine distance between class-based TF-IDF vectors. Each leaf node represents one topic, with truncated labels showing the top-ranked keywords. Horizontal linkage distance indicates semantic dissimilarity; shorter branches denote greater topic similarity. TF-IDF Term Frequency-Inverse Document Frequency.
