fitting new variograms using the up-to-date dwd weather data (here for precipitation)
DWD weather data is downloaded from https://opendata.dwd.de/climate_environment/CDC/observations_germany/climate/daily/more_precip/historical/
A comparison to the precipitation station data stored in /data/stohyd/data/processed/Germany/DWD/pre/pre_1900-2015/ to the new station data showed that some stations changed:
Nr Stations| Old LUT | New LUT | Same | Abandoned | New Stations pre |5394 |5616 |5380 |14 |236 tavg |1059 |1213 |1055 |4 |158 tmax |1059 |1213 |1055 |4 |158 tmin |1059 |1213 |1055 |4 |158
However it is unclear which data was used for calculation of the variograms used in the current drought monitor version (status: 2019-11-28).
Calculation of the variogram resulted in the following theoretical variogram parameters (using exponential variogram type)
nugget sill range Type Easting Northing BIAS RMSE r 0.3199E+00 0.9526E+00 0.6429E+05 2 0.0 0.0 0.0098 0.0009 0.9946
The Old variogram parameters were:
nugget sill range varTyp 0.2000E+00 0.9014E+00 0.3990E+05 2
Interestingly, the old nugget seems to fit the data better. The range is remarkable bigger in the new data. @thober any possible explanations?