We were tasked with creating an isohyet map showing average rainfall for Georgia. Doing isarithmic mapping manually isn't too bad at all but then we had a fairly easy dataset. Just for grins and because I had some extra time on my hands - I did input the points into an shapefile and ran the lines through the spatial analyst tools. I did it to see how different my lines were from the computer generated ones and to see the difference between the different interpolation methods. I didn't do any data checks so I am assuming I put the rainfall values in correctly but the results were close but did change from method to method. I chose not to add a legend as the numbered lines and info in the title, I felt, was sufficient.
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