GPS;  electronic maps;  control points;  Geographic Information System

Electronic map is the basis of geographic information system (GIS), in the process of electronic map production, in order to achieve the conversion from the plane coordinates of the map to the geodetic coordinates to the screen coordinates, it is necessary to use the geographical coordinates of the control point. In the actual operation process, the geographical coordinates of the control points are obtained by GPS (Global Positioning System) measurement. According to the use of GPS in the production of highway electronic maps in Henan Province, the application of GPS control points in vector data export and coordinate conversion was discussed. Taking Mengjin County and Yanshi City as examples, the role of GPS control points in map data conversion and map stitching is illustrated.