An interactive program for the digitalization of rainfall charts is presented. A curve is extracted from a scanned picture of a paper strip and the intensity of rainfall is read at a given time interval. The program allows us to modify the parameters and manually correct the results of an automatic rainfall chart reading algorithm, upon which the interactive system is based. The main methods used to correct the readings are selecting an area to be excluded from further analysis, adding inversion points and manually drawing the curve. Using this interactive program, 58 rainfall charts were processed and the results were compared to those of the Environmental Agency of the Republic of Slovenia. We proved that the interactivity allows a wider spectrum of charts to be processed and gives more accurate results than the automatic procedure.
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