Keywords : Close range Photogrammetry
Engineering and Technology Journal,
2016, Volume 34, Issue 14, Pages 2739-2753
This paper studies data manipulation using analytical relative orientation process to determine the exterior orientation parameters. This process can be accomplished by two scenarios; the first one is implemented using collinearity condition while the second one is implemented using coplanarity condition. The final results of both scenarios will be a three dimensional (3D) model and in order to specify the more precise scenario in reconstruction of (3D) models Root Mean Square Error (RMSE) for each scenario was computed. Absolute orientation process was used to transform coordinates of the model system into coordinates of the ground system then (RMSE) for each was computed. The difficulty of obtaining Ground Control Points (GCPs) that covers the photogrammetric project had been overcome by establishing a Portable Control System (PCS) .This (PCS) is a block made of an Aluminum alloy that had been shaped by a (TNC) milling machine to produce plane surfaces on it. The points of intersection of the produced surfaces on the block was labeled or coded and the distances between these points were measured manually by the digital vernier caliper 150mm and micrometer. These points represented control points in the captured images also a specific point within the block was chosen to be the center of this control system and all the remaining points was calculated with reference to it. The calculated (RMSE) for collinearity condition was 1.0212 mm. while for coplanarity condition was 1.0230 mm. So the precision of both models is nearly identical moreover coplanarity condition was more feasible for the requirements of close range photogrammetry.
Engineering and Technology Journal,
2016, Volume 34, Issue 11, Pages 2140-2151
Photogrammetry is an approach that can determine the size and the shape of objects through analyzing images recorded by a photographic or video camera.This paper studies measuring and evaluating the structure by using analytical close range photogrammetry method since it is characterized by; high precision, low effort and cost, as well as the possibility of measuring and / or assessing inaccessible places.The objective of the present study is toassess the distortion that occur during projects execution in compare with charts and designs and detect the problem by using (DCRP) with high precision to make a decision to keep or stop working.Several methods can be applied in data processing to determine 3D coordinates of object points for two or more images. To evaluate data processing using four commercial software (LPS, PhotoModeler, Photogrammetric MATLAB and AutoCAD Civil 3D). Also to overcome the difficulty of obtaining Ground Control Points (GCPs) that covers the photogrammetric object, a Portable Control System (PCS) had been established.Using a single camera Canon EOS 500D with image size is (4752 x 3168) pixels to capturing images. Two approaches used for 3D assessment of structure (single model and all models). This study depended structure of directorate of engineering projects at the university of technology this structures represented the study area.The results of analysis processes (3D model) will help the researcher to detect the distortion and suggest the proper solution for dissolve and develop it. The precision obtained from this results show high precision. The results are very promising ranges between (0.18 – 1.77) mm.