Table 2. Characteristics of the Landsat satellite data used. Image date (dd-mm-yyyy) Sun elevation angle Landsat number Scanner† Season Root mean square error 31-10-1972 32 1 MSS Wet 0.49489 08-07-1984 35 5 TM Dry 0.46038 15-08-1986 39 5 MSS Dry 0.45213 02-08-1987 37 5 MSS Dry 0.46662 †TM, Thematic Mapper; MSS, Multispectral Scanner.