identifiable by Australis. A separate set of surveys is, however, necessary for the rotating targets. Rotating targets were used because they can be seen at any angle by being turned to face the camera. However, a test was conducted to ensure that while rotating, the targets maintained the same centroid position. First, a survey was taken of a façade with the normal distribution of coded and point targets placed on it while the rotating targets were spread out in front facing parallel to the wall. Then, two similar surveys were conducted with half of the targets rotated by 45 degrees to either the left or right. After running the images through Australis and setting the same coordinate system based off non-moving point targets on the wall, the positions of all of the points in the survey, including the rotating targets, were compared between the three similar surveys. The final test of the equipment and Australis was to plan out and conduct a full survey of a building to ascertain whether or not the use of photogrammetry for the generation of a 3D model was a viable and practical approach. Not only was it necessary to find out if the creation of the model was achievable, but also if the model outputted would be accurate enough to serve as an alternative modeling technique for placement in the GIS. Although Australis does give results on the precision of the target locations by outputting standard errors and root mean squares, to determine the accuracy of the model, it is necessary to still perform a hand survey with a tape measure to obtain the real measurements. Measurements from both the photogrammetric model and the hand survey must be within one inch of agreement to sufficiently demonstrate that the photogrammetric model is valid and accurate.
identifiable by Australis. A separate set of surveys is, however, necessary for the rotating targets. Rotating targets were used because they can be seen at any angle by being turned to face the camera. However, a test was conducted to ensure that while rotating, the targets maintained the same centroid position. First, a survey was taken of a façade with the normal distribution of coded and point targets placed on it while the rotating targets were spread out in front facing parallel to the wall. Then, two similar surveys were conducted with half of the targets rotated by 45 degrees to either the left or right. After running the images through Australis and setting the same coordinate system based off non-moving point targets on the wall, the positions of all of the points in the survey, including the rotating targets, were compared between the three similar surveys. The final test of the equipment and Australis was to plan out and conduct a full survey of a building to ascertain whether or not the use of photogrammetry for the generation of a 3D model was a viable and practical approach. Not only was it necessary to find out if the creation of the model was achievable, but also if the model outputted would be accurate enough to serve as an alternative modeling technique for placement in the GIS. Although Australis does give results on the precision of the target locations by outputting standard errors and root mean squares, to determine the accuracy of the model, it is necessary to still perform a hand survey with a tape measure to obtain the real measurements. Measurements from both the photogrammetric model and the hand survey must be within one inch of agreement to sufficiently demonstrate that the photogrammetric model is valid and accurate.
Zhou_paper.docx