ANALYSIS OF ACCURACY OF INITIAL DATA USED IN MODELING RELIEF AND PROFILE OF THE MAIN PIPELINES ROUTE

Abstract

The relevance of the research is caused by fact that in order to ensure the safe operation of pipeline networks in areas with active natural processes, it is always necessary to organize monitoring of the pipeline route corridor. Comprehensive analysis of the condition of the pipeline is carried out according to various types of diagnostics, geodetic and geological surveys, as well as materials obtained using aerial photography, including aerial laser scanning materials. At the same time, information about relief in the route corridor, geometry of pipeline and dynamics of changes in state of natural and technical environment during operation of the pipeline is extremely important. The use of geographic information model of territory is effective tool for assessing state of natural and technical system of pipeline network, determining position of pipeline defects in space, analyzing the causes of their occurrence and identify trends in dynamics of natural processes. The peculiarity of such model need to use source data from different sources for create it. These are the data of in-line inspection, materials of aerial laser scanning, aerial photography using unmanned aerial vehicles, materials of engineering and geodetic surveys. Initial data have different characteristics, can be obtained on different monitoring phase, in different coordinate systems and heights, and may have different spatial accuracy at same time. The characteristics of geographic information model are determined primarily by accuracy of source data, so this issue requires special attention. The purpose of the research was to analyze the possibilities of using initial data from various sources when creating geoinformation models: aerial photography materials using unmanned aerial vehicles, aerial laser scanning, integrated diagnostics, measurements during engineering and geodetic surveys. Methods: decoding of aerial photographs, experimental research of accuracy of unmanned aerial vehicles and aerial laser scanning data, geoinformation technologies. Results. The article provides an analysis of the spatial accuracy of the initial data used in modeling the relief and profile of the pipeline route. Working with the tools of the linear coordinate system allows you to use as calibration points, objects of the main pipeline, which can be discerned from aerial survey materials. Coordinates and elevation marks of objects used for calibration can be obtained from operational documentation with reference to the kilometer of the route or geodetic survey materials. The use of linear coordinate system tools also makes it possible to fill the model with data on pipeline defects obtained in the in-line inspections, with accuracy sufficient to analyze the causes of their occurrence. In geotechnical monitoring of main pipeline, main role assigned to the technologies of the in-line inspection in order to determine pipeline defects and remote sensing. Special attention is paid to the control of the planned altitude position during the formation of a three-dimensional digital terrain model based on aerial laser scanning data, which allows us to assess the impact of exogenous geological processes on the pipeline. Smart pigging data, as well as global terrain data, should be used with great care, when forming the geoinformation space of pipeline transport in the process of modeling linear and areal pipeline objects, or they should be used after additional verification and correction.

Keywords

• natural and technical environment of pipeline transport
• in-line diagnostics
• aerial surveys
• aerial laser scanning
• in-line diagnosticsaerial laser scanning
• geoinformation model
• three-dimensional model
• spatial accuracy
• srtm
• arcticdem