Assessment of Interpolation Methods For EFAS

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The observed meteorological inputs for the European Flood Alert System (EFAS) have been analysed. Observed sources are: 1) Grid and Station data collected from the MARS-STAT data base, 2) high resolution rainfall and mean temperature data covering Germany and upper Danube (HR). Several interpolation methods have been calibrated and cross validated. The comparisons of the different interpolated data sources are discussed and the “best” interpolation method and parameters are suggested. The software station2map [3] is used to cross validate the different interpolation methods.

1. Data Sources

The data sources used for the assessment of the interpolation methods for EFAS are the JRC MARSSTAT data base, daily available from 1978 up to now, and the High Resolution Rainfall and Mean Temperature from Central Europe, available from year 1991 to 2002.

1.1 The MARS-STAT data base

The JRC-MARS project (Monitoring Agriculture through Remote Sensing techniques) provides timely information on the agricultural production to be expected in the current season, used by the European Commission for the implementation of the Common Agricultural Policy.

Available products include:
- maps of weather indicators based on observations and numerical weather models
- maps and time profiles of crop indicators based on agro-meteorological models
- maps of vegetation indices and cumulated dry matter based on remote sensing images

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