Since the traditional UAV terrain measurement has the problems of cumbersome image control point laying and low operational efficiency,in order to effectively solve its shortcomings,the image-control-free inclined photographic terrain measurement method based on GNSS RTK+IMU UAV is now proposed.Firstly,based on GNSS RTK+IMU UAV acquires the photographic terrain data and realizes the accurate measurement of the terrain,secondly,realizes the image matching of UAV image-control-free tilted data and derives the information of scale,position and direction of each control point,and lastly,sets the requirements for UAV photographic terrain mapping.Experimental results:the image-control tilt-free photographic terrain measurement method based on GNSS RTK+IMU UAV is able to effectively realize the measurement of terrain with an error value of 0.05m at most,which proves that the method has a wide range of application prospects,especially in the areas with complex terrain and difficult to reach by personnel,and is able to provide a fast and efficient ability to acquire terrain data.
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