AN IMPROVED DEM CONSTRUCTION METHOD FOR MUDFLATS BASED ON BJ-1 SMALL SATELLITE IMAGES: A CASE STUDY ON BOHAI BAY

Human activities across China show a similar trend in response to rains. However, urban resilience varies significantly by region. The northwestern arid region and the central underdeveloped areas are very fragile, and even low-intensity rains can trigger significant human activity anomalies. By contrast, even high-intensity rains might not affect residents in the southeast.

This paper utilized the advantages of smartphone location data to study human responses to rainstorm disasters. Intense rainstorms disrupt city residents' behaviors as reflected in anomalies of location-based service requests. Anomaly identification from fine-scale smartphone location data facilitates the monitoring of social responses to rainstorms. Residents' collective geotagged behaviors in different cities show different sensitivities to rainstorms.