FreqChange: Frequency-aware spatiotemporal learning with prior guidance for semantic change detection in remote sensing images - Haiyan Huang; Zhenfeng Shao; Duowang Zhu; Xiao Huang; Ruiqian Zhang; Qimin Cheng; Jindou Zhang; Yueming Duan; Deren Li (ISPRS Journal of Photogrammetry and Remote Sensing, 2026)