Unclassified vs. classified. Left: the raw multispectral image with 11 classes in the legend (Meadow, Lawn, Oak, Residential, Dry grass, Swamp, Lake, Salt evap, Comm/Indu, Transportation…). Right: the same scene after classification — each pixel assigned to one of those classes, shown as a flat color.

• A good thematic map has tight spectral separability between classes and an accuracy assessment to back it up (see slide 3).