OpenStreetMap-derived multimodal dataset across 23 cities: Paired urban morphology tiles with bioclimatic variables.

We present an OpenStreetMap-derived multimodal dataset spanning 23 cities and 11,711 tile-level samples. For each 768 × 768 m tile, we provide an aligned image pair: (i) a stylized ecological baseline that generalizes green and water features together with major roads and railways, and (ii) a target urban morphology map color-coded by functional building classes, transport infrastructure, green space, and water. Each sample includes latitude/longitude; the eight WorldClim v2.1 bioclimatic variables can be reconstructed locally with the provided script. The dataset is organized by city and indexed with JSONL records linking image paths and attributes, enabling direct integration into machine learning pipelines. Cross-city and cross-climate coverage supports training and evaluation of generative models for urban design, comparative analyses of morphology across climate regimes, and imputation of functional footprints in data-scarce regions. The ecological baseline represents a constructed pre-urban template rather than a historical map.