Geostatistical approaches for incorporating elevation into the spatial interpolation of rainfall

This paper presents three multivariate geostatistical algorithms for incorporating a digital elevation model into the spatial prediction of rainfall: simple kriging with varying local means; kriging with an external drift; and colocated cokriging. The techniques are illustrated using annual and monthly rainfall observations measured at 36 climatic stations in a 5000 km2 region of Portugal. Cross validation is used to compare the prediction...