TY JOUR TI Geoinformation analysis of forest types of geosystems using spectral index estimation KW geoinformation analysis KW remote sensing of the Earth KW soil degradation KW vegetation cover KW hydrological monitoring KW urban areas KW nature management JO INTERNATIONAL AGRICULTURAL JOURNAL AU Pyanzin, I.S. AU Yamashkin, S.A. AU Yamashkin, A.A. PY 2026 IS 0 PB Electronic science