Mapping potential evapotranspiration: the smooth interpolation of isolines with a low density station network |
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| Authors: | Angela M Gurnell |
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| Institution: | University of Southampton, England |
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| Abstract: | The criteria which may be employed when selecting an approach to a particular evapotranspiration mapping problem are discussed in the light of previous attempts at mapping evapotranspiration. Evapotranspiration mapping involves two main stages: firstly the derivation of point evapotranspiration estimates, and secondly the interpolation of isolines around these estimates. Many studies have emphasized the first stage, frequently applying estimation formulae to data from climate stations, and have given substantially less attention to the interpolation of isolines. In the present study, where potential evapotranspiration estimates were derived for only 70 stations over the area of the European Economic Community and where maps showing the general trends in potential evapotranspiration were required, the technique of isoline interpolation was of great importance. Two forms of polynomial trend surface analysis were applied to the point estimates and a technique employing a restricted use of all three dimensions of location was found to be appropriate for denning the position of the smoothed evapotranspiration isolines. |
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