| Summary: | The essential techniques used in 3D model reconstruction are LIDAR scanning, close-range photogrammetry, and aerial photogrammetry. The aim of this study is to investigate 3D building model results using a UAV platform using different altitudes and ranges. The methodology was divided into four phases. Phase one was a preliminary study and phase two was the data acquisition phase which included flight planning, camera calibration, and image acquisition at three different altitudes; 150m, 170m, and 190m and at different ranges; 180m, 190m, and 200m, respectively. Phase three was data processing whereby the resulting 3D models were generated using five steps which are image masking, image aligning, image dense clouding, image meshing, and image texturing. Phase four contained analyses on the 3D model such as accuracy assessment of the 3D model and analysis on the different altitudes and ranges employed. This study stated that the maximum accuracy was 0.195m without a control point, while the minimum accuracy was 0.123m with a control point. It shows that the 3D model with a control point produced measurements that were 37% more accurate than the 3D model without a control point. In the final analysis, the results showed that the built 3D model resulting from the UAV platform can provide an accuracy of less than 0.200m with or without control points. These findings can be applied to many fields, such as heritage and conservation in the efforts to preserve the 3D model of heritage objects. © Published under licence by IOP Publishing Ltd.
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