BEV semantic map construction method and system

The invention provides a BEV semantic map construction method and system, and relates to the technical field of map construction, and the method comprises the steps: obtaining a common weather scene graph and a complex weather scene graph of a to-be-constructed traffic scene; based on the common weather scene graph and the complex weather scene graph, carrying out combined two-stage training on the constructed map construction model, and outputting a BEV semantic map; according to the method, fog, rain, snow and other weather affecting driving safety are defined as complex weather, sunny days, cloudy days and the like are regarded as common weather, rain, fog and snow effects are added to a data set under the common weather to obtain complex weather data, traffic scene information under the common weather is called, generation of a traffic scene BEV semantic map under the complex weather is promoted, and the driving safety is improved. The problem that BEV semantic maps of traffic scenes in complex weather at