Results

 

The area at the eastern end of the Nyando basin shows what appears to be the greatest change in NDVI values independent of changes due to agricultural factors such as crop rotation and fallow periods as seen in the agricultural areas in the northwestern section of the basin.

 

            

                  NDVI Difference image p169r60

 

                  

                   1986 NDVI

 

 

            

                   2000 NDVI

 

            

                     Results displayed in ArcView

 

Negative change NDVI values are represented by green and positive change values are represented by red. White represents little change. Displaying along the continuum allows for error (e.g. lighter red and green areas may represent little to no change). These results indicate that the Nyando River Basin has experienced revegatation between 1986 and 2000. Due to these surprising and unlikely results, additional remote sensing studies are necessary to quantify these results and to identify possible sources of error.