Thursday, August 7, 2008

Index Value Plot




An index value plot is a type of visualization map. An index value is plotted on a line graph. This particular index value plot is of the steam flow averages. The Average Streamflow Index, which is plotted as the red line on the above graph, is calculated each day as the average of the streamflow index values for all the stream gaging stations in the state or water resource region having at least 30 years of record.

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