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THE SPATIAL INTERPOLATION OF AGRO-CLIMATIC DATA 
Cokriging Software and Source Code 
User’s Manual 
Version 1.0b November 1995 
 
1. Introduction 
1.1 Presentation of the method 
The spatial interpolation of agroclimatic data aims at estimating the value of rainfall, 
temperature, or any other agroclimatic parameter at a given site based on the observations at 
neighbouring locations. 
This is a problem operational agroclimatology and agrometeorology are regularly confronted 
with, for instance when estimating missing data. 
Over recent years, with the development of Geographic Information Systems (GIS), there has 
been an increased need for gridded datasets, i.e. datasets in which the value of an agroclimatic 
parameter has been estimated at regularly spaced points. From a methodological viewpoint, the 
problems of missing data interpolation and of data gridding are thus largely the same. 
It is mainly in crop forecasting for Food Security that the Agrometeorology Group of FAO has 
been led to use spatial interpolation techniques: yields are estimated using station values of 
climatic and agronomic variables, but food production data must be presented by districts and 
provinces. Yields must thus be area-averaged, which implies that yields climates must be 
computed for a number of locations exceeding the number of available meteorological 
stations. 
Area averaging 
………… 
 
相关页面: 
                                                             Methods and tools 
         
Publications 
        AEZWIN: Agroecological zoning (AGLL) 
        CLIMWAT: Climatic database to be used in combination with CROPWAT (AGLW) 
        CPSZ: Crop Production System Zones of the IGAD Sub-region 
        FAOClim 2.0: World-wide agroclimatic database CD-Rom 
        LocClim: Local climate estimator CD-Rom 
        New_LocClim: Local climate estimator (CD-Rom) 
        Spatial Interpolation of Agro-climatic data. Cokriging software and source code. 
        Spatial Interpolation of Agro-climatic data. User's manual 
        SDRN - Agrometeorology Working Papers 
        SDRN - Environment Publications 
 
 
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