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HRES T1279
- Differences between EMOSLIB and MIR are due to
- Use by MIR of an intermediate full (regular) Gaussian grid at a resolution corresponding to the target lat-lon resolution for the spectral to grid transformation followed by grid-to-grid interpolation
- MIR uses a more accurate truncation of the spectral series to correspond target grid resolution to avoid ripples from aliasing effects
- For transformations to high resolution target grids for which no spectral truncation occurs
- differences are at most +/-3K
- differences are smaller than +/-1K for more than 99% of grid points
- For transformations to lower resolution target grids
- the maximum and minimum differences are significantly larger.
- differences are smaller than +/-2K for more than 99% of grid points
- larger differences are due to sub-optimal default truncation of the spectral series used by EMOSLIB:
- EMOSLIB truncation=T799 for 0.25x0.25 where theoretical ideal used by MIR is truncation=T719
- EMOSLIB truncation= T319 for 0.5x0.5 where theoretical ideal used by MIR is truncation=T359
- EMOSLIB truncation=T213 for 1.0x1.0 where theoretical ideal used by MIR is truncation=T179
Consequently, fields produced by EMOSLIB are more affected by 'aliasing'
- The use of the intermediate grid with MIR generally produces smoother fields.
Target resolution | Statistics of differences | Histogram of differences | Global | Europe |
---|
0.1x0.1 | Maximum difference = 1.693253 Minimum difference = -1.505966 Average difference = 0.000041 Mean difference = 0.000041 Median difference = -0.000107 Standard deviation = 0.047950 Variance = 0.002299 RMS of differences = 0.047950 | -1.693253 : -1.354602 - 28 ( 0.000432%) -1.354602 : -1.015952 - 127 ( 0.001959%) -1.015952 : -0.677301 - 905 ( 0.013958%) -0.677301 : -0.338651 - 8284 ( 0.127769%) -0.338651 : 0.000000 - 3432007 ( 52.933663%) 0.000000 : 0.338651 - 3033555 ( 46.788127%) 0.338651 : 0.677301 - 7733 ( 0.119270%) 0.677301 : 1.015952 - 771 ( 0.011892%) 1.015952 : 1.354602 - 140 ( 0.002159%) 1.354602 : 1.693253 - 50 ( 0.000771%) | | |
0.125x0.125 | Maximum difference = 2.510147 Minimum difference = -2.505478 Average difference = 0.000059 Mean difference = 0.000059 Median difference = 0.000381 Standard deviation = 0.072670 Variance = 0.005281 RMS of differences = 0.072670 | -2.510147 : -2.008118 - 22 ( 0.000530%) -2.008118 : -1.506088 - 115 ( 0.002771%) -1.506088 : -1.004059 - 621 ( 0.014964%) -1.004059 : -0.502029 - 5551 ( 0.133756%) -0.502029 : 0.000000 - 2018900 ( 48.647255%) 0.000000 : 0.502029 - 2118984 ( 51.058871%) 0.502029 : 1.004059 - 5228 ( 0.125973%) 1.004059 : 1.506088 - 515 ( 0.012409%) 1.506088 : 2.008118 - 122 ( 0.002940%) 2.008118 : 2.510147 - 22 ( 0.000530%) | | |
0.25x0.25 | Maximum difference = 8.004074 Minimum difference = -7.327957 Average difference = -0.000261 Mean difference = -0.000261 Median difference = 0.000168 Standard deviation = 0.244372 Variance = 0.059717 RMS of differences = 0.244372 | -8.004074 : -6.403259 - 1 ( 0.000096%) -6.403259 : -4.802444 - 18 ( 0.001734%) -4.802444 : -3.201630 - 169 ( 0.016278%) -3.201630 : -1.600815 - 1595 ( 0.153625%) -1.600815 : 0.000000 - 514518 ( 49.556750%) 0.000000 : 1.600815 - 520200 ( 50.104022%) 1.600815 : 3.201630 - 1527 ( 0.147076%) 3.201630 : 4.802444 - 168 ( 0.016181%) 4.802444 : 6.403259 - 35 ( 0.003371%) 6.403259 : 8.004074 - 9 ( 0.000867%) | | |
0.5x0.5 | Maximum difference = 13.379105 Minimum difference = -9.935349 Average difference = -0.002242 Mean difference = -0.002242 Median difference = -0.001755 Standard deviation = 0.414993 Variance = 0.172219 RMS of differences = 0.414999 | -13.379105 : -10.703284 - 0 ( 0.000000%) -10.703284 : -8.027463 - 5 ( 0.001924%) -8.027463 : -5.351642 - 49 ( 0.018852%) -5.351642 : -2.675821 - 412 ( 0.158510%) -2.675821 : 0.000000 - 130551 ( 50.227378%) 0.000000 : 2.675821 - 128490 ( 49.434441%) 2.675821 : 5.351642 - 366 ( 0.140813%) 5.351642 : 8.027463 - 38 ( 0.014620%) 8.027463 : 10.703284 - 6 ( 0.002308%) 10.703284 : 13.379105 - 3 ( 0.001154%) | | |
1.0x1.0 | Maximum difference = 9.762299 Minimum difference = -10.036530 Average difference = -0.006566 Mean difference = -0.006566 Median difference = -0.002350 Standard deviation = 0.635313 Variance = 0.403623 RMS of differences = 0.635347 | -10.036530 : -8.029224 - 14 ( 0.021486%) -8.029224 : -6.021918 - 20 ( 0.030694%) -6.021918 : -4.014612 - 81 ( 0.124309%) -4.014612 : -2.007306 - 462 ( 0.709024%) -2.007306 : 0.000000 - 32208 ( 49.429098%) 0.000000 : 2.007306 - 31834 ( 48.855126%) 2.007306 : 4.014612 - 438 ( 0.672192%) 4.014612 : 6.021918 - 68 ( 0.104359%) 6.021918 : 8.029224 - 24 ( 0.036832%) 8.029224 : 10.036530 - 11 ( 0.016882%) | | |