This week in Cartography, we created an isohyetal map that shows annual rainfall in the state of Georgia. We were provided rainfall data values at weather station points across the state and then manually interpolated the isohyet lines. Manually interpolating the lines is not unlike Sudoku or similar brain teaser games. You have to find the best-fit dividing line between diverse data points while keeping the "rules for drawing isolines" in mind. Since this map was created completely in Adobe Illustrator, we also needed to manually label the isolines (including ticking for depressions) and the normal essential map elements (legend and North arrow in particular).
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