Interpolation of temperature at 1000 hPa affected by::
HRES T1279
- Differences between EMOSLIB and MIR are due toUse 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
- use by MIR uses of a more accurate truncation of the spectral series to correspond target grid resolution to avoid ripples from aliasing effects
HRES T1279
- For transformations to high resolution target grids (0.1x0.1 and 0.125x0.125) for which no spectral truncation occurs
- differences are at most +/-3K
- differences are smaller than +/-1K for more than 99% of grid points
These differences are due to the use of an intermediate Gaussian grid followed by grid-to-grid interpolation to the regular lat-lon grid - 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 absolute difference = 0.000041022411
Median absolute difference = - 0.000107009872
Standard deviation = 0.047950
Variance = 0.002299
RMS of differences = 0.047950 Percentage of points with absolute difference < 0.5 = 99.914%
< 1.0 = 99.994%
< 2.0 = 100.000% | -2.500000 : -1.500000 - 4 ( 0.000062%)
-1.500000 : -0.500000 - 2959 ( 0.045638%-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 500000 : 0.000000 500000 - 3432007 6478007 ( 5299.933663%913736%)
0.000000 500000 : 01.338651 - 3033555 ( 46.788127%)
0.338651 : 0.677301 - 7733 500000 - 2603 ( 0.119270%040147%)
0.677301 : 1.015952 - 771 ( 0.011892%)
1.015952 : 1.354602 - 140 ( 0.002159%)
1.354602 : 1.693253 - 50 500000 : 2.500000 - 27 ( 0.000771%000416%)
|  Image Removed Image Added
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| 0.125x0.125 | Maximum difference = 2.510147
Minimum difference = -2.505478
Average difference = 0.000059
Mean absolute difference = 0.000059033943
Median absolute difference = 0.000381015244
Standard deviation = 0.072670
Variance RMS of differences = 0.005281072670RMS of differences = 0.072670 Percentage of points with absolute difference < 0.5 = 99.703%
< 1.0 = 99.965%
< 2.0 = 99.999% | -3.500000 : -2.500000 - 2 ( 0.000048%)
-2.500000 : -1.500000 - 138 ( 0.003325%-2.510147 : -2.008118 - 22 ( 0.000530%)
-2.008118 : -1.506088 - 115 ( 0.002771%)
-1.506088 : -1.004059 - 621 ( 0.014964%)
-1.004059 500000 : -0.502029 500000 - 5551 6237 ( 0.133756%150286%)
-0.502029 500000 : 0.000000 500000 - 2018900 4137753 ( 4899.647255%702970%)
0.000000 : 0.502029 - 2118984 ( 51.058871%)
0.502029 : 1.004059 - 5228 500000 : 1.500000 - 5805 ( 0.125973%139877%)
1.004059 : 1.506088 - 515 ( 0.012409%)
1.506088 : 2.008118 - 122 500000 : 2.500000 - 144 ( 0.002940%003470%)
2.008118 500000 : 23.510147 500000 - 22 1 ( 0.000530%000024%)
|  Image Removed Image Added
| |
| 0.25x0.25 | Maximum difference = 8.004074
Minimum difference = -7.327957
Average difference = -0.000261
Mean absolute difference = - 0.000261114489
Median absolute difference = 0.000168050949
Standard deviation = 0.244372
Variance RMS of differences = 0.059717244372RMS of differences = 0.244372 Percentage of points with absolute difference < 0.5 = 96.187%
< 1.0 = 98.910%
< 2.0 = 99.820% | -8.500000 : -7.500000 - 0 ( 0.000000%)
-7.500000 -8.004074 : -6.403259 500000 - 1 ( 0.000096%)
-6.403259 .500000 : -5.500000 - 11 ( 0.001059%)
-5.500000 : -4.802444 500000 - 18 19 ( 0.001734%001830%)
-4.802444 : 500000 : -3.500000 - 87 ( 0.008380%)
-3.201630 500000 : -2.500000 - 169 339 ( 0.016278%032651%)
-32.201630 500000 : -1.600815 500000 - 1595 1667 ( 0.153625%160560%)
-1.600815 500000 : -0.500000 - 17696 ( 1.704423%)
-0.500000 : 0.000000 500000 - 514518 998656 ( 4996.556750%187394%)
0.000000 500000 : 1.600815 500000 - 520200 ( 50.104022% 17694 ( 1.704230%)
1.600815 .500000 : 2.500000 - 1590 ( 0.153144%)
2.500000 : 3.201630 500000 - 1527 325 ( 0.147076%031303%)
3.201630 500000 : 4.802444 500000 - 168 91 ( 0.016181%008765%)
4.802444 .500000 : 5.500000 - 40 ( 0.003853%)
5.500000 : 6.403259 500000 - 35 16 ( 0.003371%001541%)
6.403259 500000 : 7.500000 - 5 ( 0.000482%)
7.500000 : 8.004074 500000 - 9 3 ( 0.000867%000289%) |  Image Removed Image Added
| |
| 0.5x0.5 | Maximum difference = 13.379105
Minimum difference = -9.935349
Average difference = -0.002242
Mean Mean absolute difference = - 0.002242206355
Median absolute difference = - 0.001755101761
Standard deviation = 0.414993
Variance RMS of differences = 0.172219414999RMS of differences = 0.414999 Percentage of points with absolute difference < 0.5 = 90.877%
< 1.0 = 97.080%
< 2.0 = 99.299% | -13.500000 : -12.500000 - 0 ( 0.000000%) 0 ( 0.000000%)
-12.500000 : -11.500000 - 0 ( 0.000000%) 0 ( 0.000000%)
-11.500000 : -10.500000 - 0 ( 0.000000%) -13.379105 : -10.703284 - 0 ( 0.000000%)
-10.703284 .500000 : -9.500000 - 2 ( 0.000769%) 2 ( 0.000769%)
-9.500000 : -8.027463 - 5 500000 - 2 ( 0.000769%) 2 ( 0.001924%000769%)
-8.027463 .500000 : -7.500000 - 4 ( 0.001539%) 4 ( 0.001539%)
-7.500000 : -6.500000 - 11 ( 0.004232%) 11 ( 0.004232%)
-6.500000 : -5.351642 - 49 500000 - 30 ( 0.011542%) 30 ( 0.018852%011542%)
-5.351642 .500000 : -4.500000 - 51 ( 0.019621%) 51 ( 0.019621%)
-4.500000 : -3.500000 - 114 ( 0.043860%) 114 ( 0.043860%)
-3.500000 : -2.675821 - 412 500000 - 319 ( 0.122730%) 319 ( 0.158510%122730%)
-2.675821 .500000 : -1.500000 - 1212 ( 0.466297%) 1212 ( 0.466297%)
-1.500000 : -0.500000 - 10435 ( 4.014697%) 10435 ( 4.014697%)
-0.500000 : 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%)500000 - 236207 ( 90.876808%) 232907 ( 89.607187%)
0.500000 : 1.500000 - 9823 ( 3.779240%) 9823 ( 3.779240%)
1.500000 : 2.500000 - 1218 ( 0.468606%) 1218 ( 0.468606%)
2.500000 : 3.500000 - 300 ( 0.115420%) 300 ( 0.115420%)
3.500000 : 4.500000 - 110 ( 0.042321%) 110 ( 0.042321%)
4.500000 : 5.500000 - 39 ( 0.015005%) 39 ( 0.015005%)
5.500000 : 6.500000 - 18 ( 0.006925%) 18 ( 0.006925%)
6.500000 : 7.500000 - 11 ( 0.004232%) 11 ( 0.004232%)
7.500000 : 8.500000 - 7 ( 0.002693%) 7 ( 0.002693%)
8.500000 : 9.500000 - 2 ( 0.000769%) 2 ( 0.000769%)
9.500000 : 10.500000 - 2 ( 0.000769%) 2 ( 0.000769%)
10.500000 : 11.500000 - 2 ( 0.000769%) 2 ( 0.000769%)
11.500000 : 12.500000 - 0 ( 0.000000%) 0 ( 0.000000%)
12.500000 : 13.500000 - 1 ( 0.000385%) 1 ( 0.000385%)
|  Image Added Image Removed
| |
| 1.0x1.0 | Maximum difference = 9.762299
Minimum difference = -10.036530
Average difference = -0.006566
Mean absolute difference = - 0.006566340498
Median absolute difference = - 0.002350180267
Standard deviation = 0.635313
Variance RMS of differences = 0.403623635347RMS of differences = 0.635347 Percentage of points with absolute difference < 0.5 = 81.599%
< 1.0 = 93.099%
< 2.0 = 98.275% | -10.500000 : -9.500000 - 2 ( 0.003069%)
-9.500000 -10.036530 : -8.029224 500000 - 14 10 ( 0.021486%015347%)
-8.029224 500000 : -7.500000 - 11 ( 0.016882%)
-7.500000 : -6.021918 500000 - 5 ( 0.007673%)
-6.500000 : -5.500000 - 20 15 ( 0.030694%023020%)
-65.021918 500000 : -4.014612 500000 - 81 31 ( 0.124309%047575%)
-4.014612 500000 : -3.500000 - 95 ( 0.145795%)
-3.500000 : -2.007306 500000 - 462 190 ( 0.709024%291590%)
-2.007306 .500000 : -1.500000 - 696 ( 1.068140%)
-1.500000 : -0.500000 - 5038 ( 7.731737%)
-0.500000 : 0.000000 500000 - 32208 53170 ( 4981.429098%599141%)
0.000000 500000 : 1.500000 - 4915 ( 7.542971%)
1.500000 : 2.007306 500000 - 31834 ( 48.855126% 670 ( 1.028238%)
2.007306 .500000 : 3.500000 - 167 ( 0.256292%)
3.500000 : 4.014612 500000 - 438 65 ( 0.672192%099754%)
4.014612 .500000 : 5.500000 - 39 ( 0.059853%)
5.500000 : 6.021918 500000 - 68 17 ( 0.104359%026090%)
6.021918 500000 : 7.500000 - 10 ( 0.015347%)
7.500000 : 8.029224 500000 - 24 11 ( 0.036832%016882%)
8.029224 .500000 : 9.500000 - 2 ( 0.003069%)
9.500000 : 10.036530 500000 - 11 1 ( 0.016882%001535%) |  Image Removed Image Added
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