Comparison of selected data acquisition methods for GNSS terrain obstacles modeling

Abstract

For satellite measurements, both in navigation and surveying, unobstructed visibility of at least three (2D positioning), four (3D positioning) or five (RTK) satellites is essential. In urban areas or in the vicinity of trees knowledge of shape and location of the terrain obstacles may determine the success of GNSS positioning. The aim of the presented research is to investigate the suitability of the use of laser scanning and digital hemispherical photography for modeling terrain obstacles over the GNSS measurement points. The accuracy of data acquisition methods was examined by taking the coordinates from tacheometric measurement as the reference.