255 - 
ERTS Band 6 IR Energy 
ERTS Band 5 Red Energy 
Figure 4. ERTS images of Madison area lakes taken 28 August 
1972. On Band 5 note how the very clear Devils 
Lake»which is oliotrophic,is very dark, the some 
what enriched lakes such as Mendota and Monona 
are slightly dark, while the very enriched eutrophic 
lakes such as Kegonsa and Koshkonong are very light, 
almost indistinguishable from the surrounding fields.