The accuracy assessment of agisoft photoscan and Pix4D mapper software in orthophoto production

Abstract

Unmanned Aerial Vehicle (UAV) has succeeded in attaining a position in the aerial image survey as a cheaper and more effective for 3-dimension-modelling compared to traditional photogrammetry and Light Detection and Ranging (LIDAR). Besides that, the utilization of UAV photogrammetry software is important in giving the highest accuracy for orthophoto production. This research will compare two different software packages used namely, Agisoft PhotoScan version 1.3.1 and Pix4D version 1.3.67. The project aims to assess the accuracy of orthophoto generated using Agisoft PhotoScan and Pix4D Mapper. The ground control points (GCP) was carried out during the field survey observation and later the UAV images were processed by using the software. The processing phases involved were photo alignment, geo-referencing, dense points cloud and mesh, texture model, Digital Elevation Model (DEM), and orthophoto. The assessment on the accuracy of the software was based on both qualitative and quantitative analysis. The qualitative analysis includes points and distance measurement that used the RMSE method for accuracy, while the quantitative analysis was used on the quality of the images. Finally, the best software in accuracy specification used in UAV processing method will be determined.