Abstract
The topographic mapping application ofunmanned aerial vehicles (UAV) has been applied and is gradually becoming morepopular. Determining the exact factors external orientation of photos is one ofthe factors determining the accuracy of topographic maps should be establishedinstead of setting the image control network. This article discusses the issueof integrating GNSS-IMU devices on unmanned aerial vehicles (UAVs) incombination with virtual reference station technology (VRS) to identifyoutward-facing elements of an image with accurately ensure the creation of alarge scale terrain map with the maximum number of image control points
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