OPTIMAL SPECTRAL INDEX AND THRESHOLD APPLIED TO SENTINEL-2 DATA FOR EXTRACTING IMPERVIOUS SURFACE: VERIFICATION ACROSS LATITUDES, GROWING SEASONS, APPROACHES, AND COMPARISON TO GLOBAL DATASETS Article Dvornikov Y., Grigorieva V., Varentsov M., Vasenev V. International Journal of Applied Earth Observation and Geoinformation. Elsevier B.V.. Vol. 123. 2023.