TY JOUR TI THE USE OF GEOGRAPHIC INFORMATION PROGRAMS TO CONSTRUCT A DIGITAL ELEVATION MODEL OF THE CATCHMENT AREA OF THE CHIR RIVER KW GIS technologies KW geographic information programs KW drainage area KW Tsimlyansk reservoir KW Chir River KW central relief model. JO International Journal of Applied Sciences and Technology Integral AU Zubkov, A.Y. AU Mulin, M.O. AU Shirokova, V.A. PY 2024 IS 0 PB Electronic science