Status Draft

- to verify the results of QC2-checks - the redistribution to RR_24. Confirmation of the quality of results - rewiew of statistics? Or a separate analysis: Dataset should cover all country and both convective and frontal precipitation, and main circulation paterns (west-coast rain, central south-eastern rain, rain on nortwest coast, rain in Nordland/Troms, east Finnmark.)?

- to take active part in the general space-check algorithm.

- others?

Specification of algorithms and general guidelines.

1. Defintion of algorithms
   • Tests for interdependence, spatial correlation, pass and fail criteria …
   • Strategies for interpolation in both space and time,
   • Use of station aspect, and other methods for the choice of the best neighbours
   • Spatial bivariate, multivariate, tests etc …
   • Other statistical tests, regression techniques, appropriate residuals analysis, etc …
   • …
2. General guidelines
   • Optimum number of points to include in an interpolation,
   • Recommended statistics (e.g. monthly averages, normals, medians etc …) to use in comparison with data (e.g. for outlier checks etc., other quality controls)
   • Statistical checks to use for checking the performance of interpolation methods (e.g. see Algorithm Gallery)
   • Identification of regions that are best handled separately, e.g. North, South, East, West, Coastal, Interior, and the region variation with season
   • …
3. Other
   • Use of semivariograms in general as a method to assess spatial homogeneity
   • Automating kriging methods: calculation of semivariogram, fitting model, applying the kriging interpolator
   • Boundary detection
   • First definition of other algorithms involving satellite, radar data etc …
   • General advice on priorities on particular algorithms etc. to develop
   • …

Original testing was carried out for data obtained between March 2007 and December 2007 giving rise to a comparison to with simulated test data (constructed from real observations) as well as a comparison to the HQC:kvoss:system:qc2:requirements:nordklim:hqc_vs_rarr_24.jpg?25x25.