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DIGITIZATION OF ARC‐SHAPED TIME‐LINE EVENT RECORDING CHART: A COMPUTER ALGORITHM 1
Author(s) -
Liu C. J.,
Albright R. C.
Publication year - 1986
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1986.tb00750.x
Subject(s) - digitization , chart , computer science , algorithm , hydrography , digital recording , computer graphics (images) , engineering drawing , computer hardware , computer vision , engineering , statistics , mathematics , oceanography , geology
A mechanical drum‐type data logger registers data on a recording chart in graphic form. Subsequent computer analysis requires that the data be transformed into digital form. Besides the traditional manual chart‐interpretation techniques, electronic digitization can be used for data transformation. Our paper reports an algorithm for rectilinear digitization of event‐recording charts whose time lines are inherently arc shaped. Using this algorithm, we obtained accurate data transformations from repeated tests of digitizing hydrographic charts at the Watershed Laboratory, Department of Forestry, University of Kentucky. Our experience has shown that ‐ in terms of speed and accuracy ‐ this computer‐based procedure is superior to available alternative procedures.