Data management method and system for handheld surveying and mapping terminal

The invention is suitable for the technical field of surveying and mapping data processing, and provides a data management method and system for a handheld surveying and mapping terminal, and the method comprises the following steps: receiving a time section inputted by a user, and calling surveying and mapping data which accord with the time section; exporting position coordinates of the called surveying and mapping data, and automatically marking the position coordinates and time information when the handheld surveying and mapping terminal records the surveying and mapping data; analyzing the position coordinates, determining an engineering area range and a project area range, and generating an engineering area map and a project area map; receiving map contour adjustment information input by a user, and updating the project area map and the project area map; performing primary classification on the surveying and mapping data according to the project area map, and performing secondary classification on the s