  In this paper, we introduce STOAViz, a visual analytics tool for analyzing
the saturated thickness of the Ogallala aquifer. The saturated thicknesses are
monitored by sensors integrated on wells distributed on a vast geographic area.
Our analytics application also captures the trends and patterns (such as
average/standard deviation over time, sudden increase/decrease of saturated
thicknesses) of water on an individual well and a group of wells based on their
geographic locations. To highlight the usefulness and effectiveness of STOAViz,
we demonstrate it on the Southern High Plains Aquifer of Texas. The work was
developed using feedback from experts at the water resource center at a
university. Moreover, our technique can be applied on any geographic areas
where wells and their measurements are available.
