This exercise is based on an exceptional Landsat MSS dataset acquired on January 13, 1979. The atmosphere was unusually clear with very few clouds visible in the subscene for the M rida vicinity. Both are necessary for Idrisi to create a display. This great range of elevations over short distances gives rise to large variations in local climate, vegetation, geomorphic processes, and human land use. Distribution of precipitation is strongly controlled by elevation and prevailing winds.
Summer is the rainy season, and winter is relatively dry.
At lower elevations in relatively dry valleys, a desert-like vegetation consists of cactus, thistles and thorny plants. Main agricultural crops of the region include potatoes and carrots, which are grown year round, cattle are grazed in high meadows, and trout are raised in fish farms. This boundary separates the South American plate from the Caribbean plate. Next examine the documentation files for MR1. These files give basic information about data and file type, and geometrical features of the raster data.