Abstract
This work presents experience in the combined use of high-precision positioning methods and standard post-processing programs. This is necessary to provide geodetic support for aerial photo-geodetic work during engineering surveys in the oil and gas sector—to determine the coordinates and heights of control points using the example of an extended linear structure located in difficult physical and geographical conditions in the area of the Baikal-Amur Mainline. To solve the problem of refining the standard geoid model, based on the values of the normal heights of the starting points, using geoinformation technologies in GIS with open object code QGIS, a local spatial geoinformation correction model was created. This is a model of the surface of the difference between the normal and ellipsoidal heights of the starting points, obtained in the coordinate systems of the work object for the entire site. Analysis of the results of the work showed that modern GIS with their mathematical apparatus and geographic information technologies make it possible to create local geoid models that fully correspond to the characteristics of the work area. They are necessary because the post-processing programs used contain a standard geoid model that does not take into account local factors of geoid change for specific territories. The use of the proposed method can significantly simplify logistics processes when performing geodetic work, without reducing their accuracy at the same time. At all stages of the work, the capabilities and tools of modern geographic information systems and technologies were used, allowing for the effective comparison of engineering survey data and assessment of the accuracy of topographic and geodetic work.