... on April 15, 199 9.Popular satellite-based sensors and platforms include Landsat MSS and TM,AVHRR, AVIRIS, SPOT XS, GOES, SEASAT, SIR, RADARSAT, SRTM, TOPSAT,ERS-1 and 2, and JERS-1 (Luce, 2001; ... visibility, beach charac-teristics, and near-shore soil and vegetation (Lillesand and Kiefer, 199 9).In the future, maps of dubious accuracy will not be digitized into a GIS. Con-temporary imagery ... colorimages. Landsat 4 was retired in 199 1, and Landsat 5’s MSS sensor failed in October 199 3. The successor satellite, Landsat 6, failed to achieve orbit in 199 3. To keep theimagery flowing, Landsat...