Interpolation of temperature at 2m is affected by the changes to:

  • the land sea-mask processing
  • the default interpolation method
  • the distance computation and selection of nearest points

HRES - O1280

Temperature at 2m has been interpolated from the O1280 octahedral reduced Gaussian grid to regular lat-lon grids at different target resolutions using EMOSLIB and MIR. 

  • For the cases shown here, differences between MIR and EMOSLIB generally lie between +/-5K.
  • In general, more than 99.55% of points differ by less than +/-0.5 K.
  • The largest differences occur close to the coasts and in areas of steep orography where the gradient of the 2m temperature field changes most rapidly

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 25% of the maximum absolute difference are indicated with red (EMOSLIB greater than MIR) and blue (EMOSLIB less than MIR) filled circles.


Target resolutionStatistics of differencesHistogram of differencesGlobalEurope
0.1x0.1

Maximum difference = 4.757812
Minimum difference = -4.185547
Mean absolute difference = 0.011020
Median absolute difference = 0.001953
Standard deviation = 0.054195
RMS of differences = 0.054195

 Percentage of points with absolute difference

        < 0.5 = 99.771%
        < 1.0 = 99.955%
        < 2.0 = 99.996%

-5.5 : -4.5 -          0 (  0.000000%)
-4.5 : -3.5 -          4 (  0.000062%)
-3.5 : -2.5 -         44 (  0.000679%)
-2.5 : -1.5 -        322 (  0.004966%)
-1.5 : -0.5 -       7168 (  0.110556%)
-0.5 : 0.5 -    6468824 ( 99.772102%)
  0.5 : 1.5 -       6847 (  0.105605%)
  1.5 : 2.5 -        354 (  0.005460%)
  2.5 : 3.5 -         31 (  0.000478%)
  3.5 : 4.5 -          4 (  0.000062%)
  4.5 : 5.5 -          2 (  0.000031%)

0.125x0.125

Maximum difference = 5.131653
Minimum difference = -3.907410
Mean absolute difference = 0.011335
Median absolute difference = 0.001160
Standard deviation = 0.054557
RMS of differences = 0.054557

 Percentage of points with absolute difference

        < 0.5 = 99.772%
        < 1.0 = 99.954%
        < 2.0 = 99.996%

-6.5 : -5.5 -          0 (  0.000000%)
-5.5 : -4.5 -          0 (  0.000000%)
-4.5 : -3.5 -          3 (  0.000072%)
-3.5 : -2.5 -         25 (  0.000602%)
-2.5 : -1.5 -        230 (  0.005542%)
-1.5 : -0.5 -       4543 (  0.109468%)
-0.5 : 0.5 -    4140621 ( 99.772077%)
 0.5 : 1.5 -       4386 (  0.105685%)
 1.5 : 2.5 -        249 (  0.006000%)
 2.5 : 3.5 -         20 (  0.000482%)
 3.5 : 4.5 -          2 (  0.000048%)
 4.5 : 5.5 -          1 (  0.000024%)
 5.5 : 6.5 -          0 (  0.000000%)

0.25x0.25

Maximum difference = 3.029404
Minimum difference = -3.908096
Mean absolute difference = 0.011457
Median absolute difference = 0.001846
Standard deviation = 0.057023
RMS of differences = 0.057023

Percentage of points with absolute difference

        < 0.5 = 99.743%
        < 1.0 = 99.946%
        < 2.0 = 99.996%

-4.5 : -3.5 -          1 (  0.000096%)
-3.5 : -2.5 -          7 (  0.000674%)
-2.5 : -1.5 -         60 (  0.005779%)
-1.5 : -0.5 -       1293 (  0.124538%)
-0.5 : 0.5 -    1035573 ( 99.743123%)
  0.5 : 1.5 -       1224 (  0.117892%)
  1.5 : 2.5 -         79 (  0.007609%)
  2.5 : 3.5 -          3 (  0.000289%)
  3.5 : 4.5 -          0 (  0.000000%)



0.5x0.5

Maximum difference = 4.168945
Minimum difference = -3.477539
Mean absolute difference = 0.013174
Median absolute difference = 0.000977
Standard deviation = 0.066953
RMS of differences = 0.066953

Percentage of points with absolute difference

        < 0.5 = 99.645%
        < 1.0 = 99.920%
        < 2.0 = 99.990%

-5.5 : -4.5 -          0 (  0.000000%)
-4.5 : -3.5 -          0 (  0.000000%)
-3.5 : -2.5 -          4 (  0.001539%)
-2.5 : -1.5 -         23 (  0.008849%)
-1.5 : -0.5 -        434 (  0.166974%)
-0.5 : 0.5 -     258998 ( 99.645275%)
  0.5 : 1.5 -        433 (  0.166590%)
  1.5 : 2.5 -         25 (  0.009618%)
  2.5 : 3.5 -          2 (  0.000769%)
  3.5 : 4.5 -          1 (  0.000385%)
  4.5 : 5.5 -          0 (  0.000000%)

1.0x1.0

Maximum difference = 2.676575
Minimum difference = -1.856628
Mean absolute difference = 0.013214
Median absolute difference = 0.001160
Standard deviation = 0.063501
RMS of differences = 0.063501

Percentage of points with absolute difference

        < 0.5 = 99.652%
        < 1.0 = 99.932%
        < 2.0 = 99.994%

-3.5 : -2.5 -          0 (  0.000000%)
-2.5 : -1.5 -          2 (  0.003069%)
-1.5 : -0.5 -        116 (  0.178023%)
-0.5 : 0.5 -      64933 ( 99.651627%)
  0.5 : 1.5 -        104 (  0.159607%)
  1.5 : 2.5 -          4 (  0.006139%)
  2.5 : 3.5 -          1 (  0.001535%)