Irrigation in Nebraska 1954-1989
This animation was created by Todd D. Noble during the Fall semester of
1989 using MacChoro with Map Animation. The individual frames of the animation
were later converted to a QuickTime movie in the Spring of 1995 using Adobe
Premiere. A brief "dissolve" transition effect was added between
each frame with Adobe Premiere.
The shadings were assigned by county using an unclassed algorithm. The
number of shadings, however, are limited to 16 shadings so the maps can
be regarded as 16 class, equal-interval maps. Each data set is classified
individually so that the shadings do not represent an absolute quantity
but are relative the extreme (highest and lowest) values in each data set.