Stefan, HeinzFu, Alec2011-10-292011-10-291979-07https://hdl.handle.net/11299/117295LANDSAT images taken in the fall of 1972, 1973, 1974 and 1975 were analyzed to estimate dates of ice formation on Minnesota lakes. Lakes located in the northern, central and southern parts of Minnesota were studied. Lake surface areas and depths were identified from a lake inventory. The observations derived from the satellite images were compared to theoretical prediction of freeze-over dates based on seasonal heat budget cycles and water temperature cycles. The theory was then applied to all of Minnesota to provide an estimate of average annual freeze-over dates of lakes located in different parts of the state and having different depths. LANDSAT images taken in the Spring of 1976 were analyzed to determine ice break-up dates.en-USReport