Validation Results

Summary: ERA5_CCI_COMBINED_v04.7_v05.2

  • Started validation on Oct. 22, 2020, 7:19 a.m. UTC, finished on Oct. 23, 2020, 2:19 a.m. UTC.
  • Compared 3 datasets:
    • Dataset 1: ESA CCI SM combined (v05.2, sm) [Filters: Variable in valid geophysical range; Data with no inconsistencies detected (flag = 0); ]
    • Dataset 2: ESA CCI SM combined (v04.7, sm) [Filters: Variable in valid geophysical range; Data with no inconsistencies detected (flag = 0); ]
    • Reference: ERA5 (v20190613, swvl1) [Filters: Soil not frozen; Variable in valid geophysical range; ]
  • Validated globally.
  • Validation period / temporal filter: Jan. 1, 1978, midnight UTC to Dec. 31, 2019, 11:59 p.m. UTC.
  • Validation metrics calculated from absolute values.
  • Triple collocation analysis was activated.
  • Scaling reference: ERA5 (v20190613, swvl1) [Filters: Soil not frozen; Variable in valid geophysical range; ]
  • Scaling method: Mean/standard deviation.
  • Processing took 1139 minutes (wall time).
  • 0% (0 of 244450) of the processed locations (grid points) produced errors during calculation.
  • This result was published on zenodo with DOI 10.5281/zenodo.4120784.
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Summary statistics

The mean, median and standard deviation are calculated on the validation results aggregated by metric and dataset. The reference dataset used is ERA5 (v20190613, swvl1).

Metric Mean Median IQ range Dataset
# observations 3663.19 3508. 2985. All datasets
Bias (difference of means) [m³/m³] ~ 0 ~ 0 ~ 0 2-ESA_CCI_SM_combined (v04.7)
Bias (difference of means) [m³/m³] ~ 0 ~ 0 ~ 0 1-ESA_CCI_SM_combined (v05.2)
Error standard deviation [m³/m³] 4.6e-03 4.12e-03 4.62e-03 1-ESA_CCI_SM_combined (v05.2); other ref: 2-ESA_CCI_SM_combined (v04.7)
Error standard deviation [m³/m³] 7.8e-03 6.47e-03 6.73e-03 2-ESA_CCI_SM_combined (v04.7); other ref: 1-ESA_CCI_SM_combined (v05.2)
Mean square error [(m³/m³)²] 4.00e-03 3.27e-03 2.77e-03 2-ESA_CCI_SM_combined (v04.7)
Mean square error [(m³/m³)²] 3.94e-03 3.20e-03 2.76e-03 1-ESA_CCI_SM_combined (v05.2)
Mean square error bias [(m³/m³)²] ~ 0 ~ 0 ~ 0 2-ESA_CCI_SM_combined (v04.7)
Mean square error bias [(m³/m³)²] ~ 0 ~ 0 ~ 0 1-ESA_CCI_SM_combined (v05.2)
Mean square error correlation [(m³/m³)²] 4.00e-03 3.27e-03 2.77e-03 2-ESA_CCI_SM_combined (v04.7)
Mean square error correlation [(m³/m³)²] 3.94e-03 3.20e-03 2.76e-03 1-ESA_CCI_SM_combined (v05.2)
Mean square error variance [(m³/m³)²] ~ 0 ~ 0 ~ 0 2-ESA_CCI_SM_combined (v04.7)
Mean square error variance [(m³/m³)²] ~ 0 ~ 0 ~ 0 1-ESA_CCI_SM_combined (v05.2)
Pearson's r [-] 0.46 0.52 0.47 1-ESA_CCI_SM_combined (v05.2)
Pearson's r [-] 0.46 0.51 0.47 2-ESA_CCI_SM_combined (v04.7)
Pearson's r p-value [-] 1.76e-02 ~ 0 ~ 0 1-ESA_CCI_SM_combined (v05.2)
Pearson's r p-value [-] 1.85e-02 ~ 0 ~ 0 2-ESA_CCI_SM_combined (v04.7)
Residual sum of squares [(m³/m³)²] 12.16 10.76 9.29 1-ESA_CCI_SM_combined (v05.2)
Residual sum of squares [(m³/m³)²] 12.39 10.98 9.52 2-ESA_CCI_SM_combined (v04.7)
Root-mean-square deviation [m³/m³] 5.84e-02 5.66e-02 2.38e-02 1-ESA_CCI_SM_combined (v05.2)
Root-mean-square deviation [m³/m³] 5.89e-02 5.72e-02 2.36e-02 2-ESA_CCI_SM_combined (v04.7)
Signal-to-noise ratio [db] 15.5 15.60 9.01 1-ESA_CCI_SM_combined (v05.2); other ref: 2-ESA_CCI_SM_combined (v04.7)
Signal-to-noise ratio [db] 13.45 13.54 6.23 2-ESA_CCI_SM_combined (v04.7); other ref: 1-ESA_CCI_SM_combined (v05.2)
Spearman's rho [-] 0.45 0.5 0.48 1-ESA_CCI_SM_combined (v05.2)
Spearman's rho [-] 0.44 0.49 0.48 2-ESA_CCI_SM_combined (v04.7)
Spearman's rho p-value [-] 1.90e-02 ~ 0 ~ 0 1-ESA_CCI_SM_combined (v05.2)
Spearman's rho p-value [-] 2.09e-02 ~ 0 ~ 0 2-ESA_CCI_SM_combined (v04.7)
TC scaling coefficient [m³/m³] 0.47 0.53 0.47 1-ESA_CCI_SM_combined (v05.2); other ref: 2-ESA_CCI_SM_combined (v04.7)
TC scaling coefficient [m³/m³] 0.49 0.54 0.48 2-ESA_CCI_SM_combined (v04.7); other ref: 1-ESA_CCI_SM_combined (v05.2)
Unbiased root-mean-square deviation [m³/m³] 5.89e-02 5.72e-02 2.36e-02 2-ESA_CCI_SM_combined (v04.7)
Unbiased root-mean-square deviation [m³/m³] 5.84e-02 5.66e-02 2.38e-02 1-ESA_CCI_SM_combined (v05.2)

Result files

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