BFASTm-L2, an unsupervised LULCC detection based on seasonal change detection – An application to large-scale land acquisitions in Senegal

•Change maps based on breakpoint magnitudes often highlight abrupt/amplitude changes.•Land use changes induced by Large-Scale Land Acquisitions are mostly seasonal.•BFASTm-L2, a fast and unsupervised new method to timely detect seasonal changes.•BFASTm-L2 over performed BFASTm, BFAST Lite, Edyn mapping regional LSLAs.•BFASTm-L2 may be used to highlight important land use changes at regional scale.