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Although early crowd forecasting has become possible by leveraging visitors\u2019 mobility schedules extracted from transit search logs, the forecasting area is limited to regions near railroad stations because the logs do not explicitly reflect, but only implicitly, the locations away from stations where people go after arriving. To address this issue, this paper presents an early crowd forecasting method capable of predicting crowding a week in advance in both station vicinities and areas away from stations by introducing an innovative crowd forecasting model called <jats:italic>geographically complemented multi-task Poisson regression (GCPR)<\/jats:italic>. Our method infers the flows of people after they arrive at railroad stations based on GPS-based mobility logs and transit search logs by leveraging the heterogeneous characteristics of nearby stations. Specifically, the model forecasts the number of visitors to an event 1\u00a0week in advance by using transit search logs recorded more than 1\u00a0week prior to the event, along with contextual features (such as day of the week) and time information. Furthermore, the model performs multi-task learning for station arrival schedules and mobility patterns, addressing the challenge of accurately predicting people flow to congestion points based on geographical and mobility proximity between stations and crowded areas. We conduct an empirical evaluation using a real-world dataset that includes 12 large-scale events held in Japan from 2019 to 2020, such as the Jingu Gaien Fireworks Festival, the Comik Market 96, and the Rugby World Cup 2019. Results demonstrate that the GCPR can forecast crowd gatherings 1\u00a0week before their occurrence in areas previously challenging to predict, achieving up to 42% performance improvement over CityOutlook+, a state-of-the-art approach for early crowd forecasting.<\/jats:p>","DOI":"10.1186\/s40537-025-01214-6","type":"journal-article","created":{"date-parts":[[2025,7,8]],"date-time":"2025-07-08T06:46:21Z","timestamp":1751957181000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Early crowd forecasting away from stations by geographically complemented regression using transit search and mobility logs"],"prefix":"10.1186","volume":"12","author":[{"given":"Soto","family":"Anno","sequence":"first","affiliation":[]},{"given":"Kota","family":"Tsubouchi","sequence":"additional","affiliation":[]},{"given":"Masamichi","family":"Shimosaka","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,7,8]]},"reference":[{"key":"1214_CR1","volume":"32","author":"A Ali","year":"2021","unstructured":"Ali A, et al. 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