Instant updating and distributing method and system for foundation pit survey tasks based on unmanned aerial vehicle

The invention discloses a foundation pit survey task instant updating and distributing method and system based on an unmanned aerial vehicle. The method comprises the steps that an unmanned aerial vehicle survey mechanism is established; a survey task management platform is built, and task management logic is configured; an image analysis module of the platform is configured to divide a corresponding image into specified survey point data and in-transit data based on attributes of image transmission data; the flight task management module is used for identifying the specified survey point data, judging whether a preset task updating condition is met or not, and if yes, making a response by the flight task management module; a flight task management module of the platform is configured to read an identification result of specified survey point data and record the identification result as a task updating factor; and a task updating plan database is searched according to the task updating factors, if a matching