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Vertical stratification and route collaborative optimization of low-altitude airspace in hilly cities
MU Ren, ZHANG Lijun, XU Ming, WEI Xiaoshun, YAO Junya, LV Hanbo
PROGRESS IN GEOGRAPHY . 2026, (7): 1487 -1507 .  DOI: 10.18306/dlkxjz.2026.07.008