IMPROVEMENT OF THE PHOTOGRAMMETRIC SURVEY METHOD IN UNDERGROUND MINE WORKINGS CONSIDERING HUMIDITY (CASE STUDY OF GISSARAK HPP TUNNELS)

Abstract

This study explores the specifc features
of photogrammetric surveying of cross-sections
in underground mine workings located in high
humidity environments, particularly near reservoirs.
The theoretical foundations of photogrammetry,
hardware and software tools, and the measurement
methodology under hydrogeological conditions are
analyzed. Special attention is given to the impact
of humidity on image quality, including reduced
contrast. Based on the research results, a humidity
correction coeffcient is proposed to improve the
accuracy of photogrammetric measurements and
enhance spatial modeling technologies for mine
workings in complex hydrogeological conditions.