Abstract
Abstract. Close-Range Photogrammetry (CRP) technology advanced rapidly along with the development of camera sensors. CRP has many advantages over other methods in terms of technical data acquisition, product quality, and cost. Because of these advantages, the CRP method can be used in various applications. In this study, the CRP method is used to monitor the deformation of the SF6 Gas Insulated Line (GIL) object between two substations of the Indonesian National Electricity Service in Kuningan Barat, South Jakarta. Planning was carried out with a simulation using 3D field data obtained from reconnaissance process. During the survey, photo data was collected using a smartphone and processed to form a 3D model. The simulation produced a configuration of control points, check points, and camera stations that have the best Strength of Figure (SoF) values. In the planning process, camera pre-calibration is carried out to get the best camera orientation parameter values from several experiments. The planning results are used in the next stage, namely field data acquisition and data processing. The data acquisition process was carried out for two sessions. This is done to see the changes in coordinates that occur between these sessions. Data processing was carried out by following the classical photogrammetric stages. The results obtained from this study are the average accuracy produced by Close-Range Photogrammetry method for measuring deformation which is below a tolerance of 3 mm. With this method, deformation measurements can be carried out quickly, accurately, and at a relatively lower cost than other observation methods.
Highlights
Deformation monitoring is an essential part of natural disaster mitigation efforts to reduce the impact of such events
Geometric analysis can be done by quantifying the amount of deformation that occurs by determining the coordinate shift vector's magnitude
We propose Close-Range Photogrammetry (CRP) method to be used as a deformation measurement solution for small objects with high accuracy and low cost, in the case of SF6 Gas Insulated Line (GIL) objects
Summary
Deformation monitoring is an essential part of natural disaster mitigation efforts to reduce the impact of such events. Deformation is a change of the dimensions and, in some cases, the shape of a body due to an applied external force (Ratner, 2003). Geometric analysis can be done by quantifying the amount of deformation that occurs by determining the coordinate shift vector's magnitude. The calculation of the geometric deformation in some cases requires observations that yield data down to the millimetre fraction. This must be supported by tools, technology, and methods, requiring data resolution of up to the fraction of millimetre and submillimetre in some instances
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