Tao SunHui XiaLin LiHang ShenYu Liu2025-05-142025-05-142019jz000156-0580https://tustorage.ulb.tu-darmstadt.de/handle/tustorage/29608550A Semantic Expansion Model for VGI RetrievalArticlehttps://doi.org/10.3390/ijgi8120589