Monthly precipitation mapping of the Iberian Peninsula using spatial interpolation tools implemented in a Geographic Information System |
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| Authors: | M Ninyerola X Pons J M Roure |
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| Institution: | (1) Department of Animal Biology, Vegetal Biology and Ecology, Autonomous University of Barcelona, Barcelona, Spain;(2) Department of Geography and Center for Ecological Research and Forestry Applications, Autonomous University of Barcelona, Barcelona, Spain |
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| Abstract: | Summary In this study, spatial interpolation techniques have been applied to develop an objective climatic cartography of precipitation
in the Iberian Peninsula (583,551 km2). The resulting maps have a 200 m spatial resolution and a monthly temporal resolution. Multiple regression, combined with
a residual correction method, has been used to interpolate the observed data collected from the meteorological stations. This
method is attractive as it takes into account geographic information (independent variables) to interpolate the climatic data
(dependent variable). Several models have been developed using different independent variables, applying several interpolation
techniques and grouping the observed data into different subsets (drainage basin models) or into a single set (global model).
Each map is provided with its associated accuracy, which is obtained through a simple regression between independent observed
data and predicted values. This validation has shown that the most accurate results are obtained when using the global model
with multiple regression mixed with the splines interpolation of the residuals. In this optimum case, the average R
2 (mean of all the months) is 0.85. The entire process has been implemented in a GIS (Geographic Information System) which
has greatly facilitated the filtering, querying, mapping and distributing of the final cartography. |
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