AREAL RAINFALL EVALUATION USING TWO SURFACE FITTING TECHNIQUES

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Abstract
Two trend surface fitting techniques, the use of bi-cubic splines and multiquadric analysis, have been applied to the determination of areal rainfall. On two mathematically defined test surfaces, the methods were applied using gridded data; the bi-cubic splines gave the better results. For non-gridded data, selected and random points, the multiquadric analysis gives satisfactory values. With real catchment and storm data, multiquadric analysis is shown to be a potentially very useful and flexible method for determining areal rainfall.
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