Empirical Accuracy Assessment of UAV Photogrammetric Mapping

  • 郭 雪菲

Student thesis: Master's Thesis


In recent years over hundreds of UAV systems have been developed in some classes and fit the photogrammetry community need The technology of UAV photogrammetry is widely available by the presence of passive imaging sensor in optical Near Infrared (NIR) and Thermal Infrared (TIR) systems For mapping purposes the variety of user-friendly software can improve the final products generating process becomes more automatic The product quality should be controlled by the users and therefore it is necessary to understand the influencing and the most important factors in the process of generating products especially when the products do not meet the quality requirement This thesis will show and discuss the results of analysis of the influencing and the most important factors on the block adjustment as well as DSM and orthophoto generating processes In block adjustment process there are several tests are arranged to investigate the influence of flight altitude double block configuration image exposure position and camera calibration Several tests are also designed to check the influence of flight altitude and double block configuration on the generated DSM and orthophoto Aerial images of calibration field at NanGang Industrial Area Nantou County Taiwan were acquired using two different UAV systems Totally 15 data sets in different flight configurations are processed in block adjustment using 3 different scenarios based on the presence of GCPs and image exposure position In block adjustment process the most influencing factors are the image exposure position accuracy and camera calibration process In spite of improving the resulting accuracy presenting accurate image exposure position decreasing the flight altitude and utilizing double block configuration cannot compress the remaining systematic error The presence of 5 GCPs can significantly minimize the systematic error on the results in which have inaccurate image exposure position However utilizing 5 GCPs without camera calibration in adjustment process cannot suppress the remaining systematic error The changes of flight altitude varying with the image exposure position accuracy Utilizing single block tends to reduce the achievable accuracy In DSM and orthophoto generation increase the flight altitude can reduce the accuracy Applying double block can improve the visualization and reduce the over-exposure effect on digital orthophoto Other remaining factors are discovered influence the DSM and orthophoto qualities including camera and flight settings the products resolution and the light conditions
Date of Award2018 Jan 25
Original languageEnglish
SupervisorYi-Hsing Tseng (Supervisor)

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