Interpolation of significant wave height is affected by the changes to
- the default interpolation method
- the distance computation and selection of nearest points
- the handling of missing values
HRES WAM 0.125 degree reduced lat-lon grid
Significant wave height has been interpolated from the 0.125 degree reduced lat-lon grid to regular lat-lon grids at different target resolutions using EMOSLIB and MIR.
- The differences for more than 99.8% of grid points are less than 0.05m.
- The largest differences occur close to the coasts and ice shelves. These are due to the different distance computation and selection of nearest points and different handling of missing values in the interpolation formula.
The plots show the differences with the contours chosen on a logarithmic scale to enhance the smaller differences. Differences smaller than 0.1% of the field range are not shown. Grid points where the absolute difference is greater than 50% of the maximum absolute difference are indicated with red (EMOSLIB greater than MIR) and blue (EMOSLIB less than MIR) filled circles.
| Target | Statistics of differences | Histogram of differences | Global | Europe |
|---|
| 0.125x0.125 | Maximum difference = 1.139648
Minimum difference = -1.192383
Mean absolute difference = 0.000186
Median absolute difference = 0.000000
Standard deviation = 0.005439
RMS of differences = 0.005439 Percentage of points with absolute difference < 0.05 = 99.895%
< 0.10 = 99.953%
< 0.50 = 99.999% | -1.2 : -1.1 - 1 ( 0.000024%)
-1.1 : -1.0 - 1 ( 0.000024%)
-1.0 : -0.9 - 4 ( 0.000096%)
-0.9 : -0.8 - 3 ( 0.000072%)
-0.8 : -0.7 - 3 ( 0.000072%)
-0.7 : -0.6 - 7 ( 0.000169%)
-0.6 : -0.5 - 10 ( 0.000241%)
-0.5 : -0.4 - 26 ( 0.000626%)
-0.4 : -0.3 - 70 ( 0.001687%)
-0.3 : -0.2 - 182 ( 0.004385%)
-0.2 : -0.1 - 763 ( 0.018385%)
-0.1 : 0.0 - 42440 ( 1.022631%)
0.0 : 0.1 - 4105684 ( 98.930237%)
0.1 : 0.2 - 593 ( 0.014289%)
0.2 : 0.3 - 167 ( 0.004024%)
0.3 : 0.4 - 58 ( 0.001398%)
0.4 : 0.5 - 36 ( 0.000867%)
0.5 : 0.6 - 14 ( 0.000337%)
0.6 : 0.7 - 4 ( 0.000096%)
0.7 : 0.8 - 9 ( 0.000217%)
0.8 : 0.9 - 2 ( 0.000048%)
0.9 : 1.0 - 1 ( 0.000024%)
1.0 : 1.1 - 1 ( 0.000024%)
1.1 : 1.2 - 1 ( 0.000024%) | | |
| 0.25x0.25 | Maximum difference = 1.139648
Minimum difference = -0.675537
Mean absolute difference = 0.000182
Median absolute difference = 0.000000
Standard deviation = 0.005373
RMS of differences = 0.005373 Percentage of points with absolute difference < 0.05 = 99.897%
< 0.10 = 99.953%
< 0.50 = 99.999% | -1.2 : -1.1 - 0 ( 0.000000%)
-1.1 : -1.0 - 0 ( 0.000000%)
-1.0 : -0.9 - 0 ( 0.000000%)
-0.9 : -0.8 - 0 ( 0.000000%)
-0.8 : -0.7 - 0 ( 0.000000%)
-0.7 : -0.6 - 4 ( 0.000385%)
-0.6 : -0.5 - 1 ( 0.000096%)
-0.5 : -0.4 - 8 ( 0.000771%)
-0.4 : -0.3 - 17 ( 0.001637%)
-0.3 : -0.2 - 50 ( 0.004816%)
-0.2 : -0.1 - 180 ( 0.017337%)
-0.1 : 0.0 - 10962 ( 1.055825%)
0.0 : 0.1 - 1026794 ( 98.897557%)
0.1 : 0.2 - 142 ( 0.013677%)
0.2 : 0.3 - 44 ( 0.004238%)
0.3 : 0.4 - 20 ( 0.001926%)
0.4 : 0.5 - 9 ( 0.000867%)
0.5 : 0.6 - 4 ( 0.000385%)
0.6 : 0.7 - 1 ( 0.000096%)
0.7 : 0.8 - 3 ( 0.000289%)
0.8 : 0.9 - 0 ( 0.000000%)
0.9 : 1.0 - 0 ( 0.000000%)
1.0 : 1.1 - 0 ( 0.000000%)
1.1 : 1.2 - 1 ( 0.000096%) | | |
| 0.5x0.5 | Maximum difference = 0.535156
Minimum difference = -0.661621
Mean absolute difference = 0.000189
Median absolute difference = 0.000000
Standard deviation = 0.005269
RMS of differences = 0.005269 Percentage of points with absolute difference < 0.05 = 99.889%
< 0.10 = 99.952%
< 0.50 = 99.999% | -0.7 : -0.6 - 1 ( 0.000385%)
-0.6 : -0.5 - 0 ( 0.000000%)
-0.5 : -0.4 - 1 ( 0.000385%)
-0.4 : -0.3 - 6 ( 0.002308%)
-0.3 : -0.2 - 17 ( 0.006540%)
-0.2 : -0.1 - 40 ( 0.015389%)
-0.1 : 0.0 - 2821 ( 1.085334%)
0.0 : 0.1 - 256974 ( 98.866574%)
0.1 : 0.2 - 42 ( 0.016159%)
0.2 : 0.3 - 9 ( 0.003463%)
0.3 : 0.4 - 5 ( 0.001924%)
0.4 : 0.5 - 2 ( 0.000769%)
0.5 : 0.6 - 2 ( 0.000769%)
0.6 : 0.7 - 0 ( 0.000000%) | | |
| 1.0x1.0 | Maximum difference = 0.424805
Minimum difference = -0.413086
Mean absolute difference = 0.000183
Median absolute difference = 0.000000
Standard deviation = 0.005198
RMS of differences = 0.005198 Percentage of points with absolute difference < 0.05 = 99.902%
< 0.10 = 99.954%
< 0.50 = 100.000% | -0.5 : -0.4 - 1 ( 0.001535%)
-0.4 : -0.3 - 0 ( 0.000000%)
-0.3 : -0.2 - 3 ( 0.004604%)
-0.2 : -0.1 - 7 ( 0.010743%)
-0.1 : 0.0 - 704 ( 1.080417%)
0.0 : 0.1 - 64426 ( 98.873542%)
0.1 : 0.2 - 11 ( 0.016882%)
0.2 : 0.3 - 5 ( 0.007673%)
0.3 : 0.4 - 2 ( 0.003069%)
0.4 : 0.5 - 1 ( 0.001535%) | | |
