The scatter plot is a type of geovisualization, where individual data points are plotted on a graph. A trend line is then adding showing the mean and directional how the data lays out. This plot is from U.S. Department of the Interior and shows reservoir water surface elevation in feet verse the hydraulic piezometer water surface elevation also in feet. They both increase up the trend line, thus indicating a positive relationship. The dots are also close to the line showing a strong relationship. Also, instead of just using dots in the scatter, they instead used the value of the data points.
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