EMOSLIB does not apply any land sea-mask processing when interpolating the mean sea-level pressure so differences arise only from the different interpolation method and selection of nearest points used by MIR

HRES O1280

Mean sea-level pressure has been interpolated from the O1280 octahedral reduced Gaussian grid to regular lat-lon grids at different target resolutions using EMOSLIB and MIR.

The differences for more than 99% of grid points are less than 20Pa and in the cases presented here all differences are less than 1 hPa.
The largest differences occur in regions of high orography with the field gradient changes most rapidly.
Larger differences are also seen in the lower resolution target grids (0.5ºx0.5º and 1.0ºx1.0º) at the polar latitudes (90ºN and 90ºS) which arise from the different handling of the interpolation at the poles.

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 resolution	Statistics of differences	Histogram of differences
0.1x0.1	Maximum difference = 68.125000 Minimum difference = -91.375000 Mean absolute difference = 0.312304 Median absolute difference = 0.125000 Standard deviation = 1.072257 RMS of differences = 1.072257 Percentage of points with absolute difference < 1.0 = 95.306% < 2.0 = 97.828% < 10.0 = 99.743%	-100.0 : -90.0 - 1 ( 0.000015%) -90.0 : -80.0 - 0 ( 0.000000%) -80.0 : -70.0 - 1 ( 0.000015%) -70.0 : -60.0 - 5 ( 0.000077%) -60.0 : -50.0 - 12 ( 0.000185%) -50.0 : -40.0 - 36 ( 0.000555%) -40.0 : -30.0 - 153 ( 0.002360%) -30.0 : -20.0 - 638 ( 0.009840%) -20.0 : -10.0 - 7583 ( 0.116957%) -10.0 : 0.0 - 3294855 ( 50.818295%) 0.0 : 10.0 - 3172050 ( 48.924209%) 10.0 : 20.0 - 7478 ( 0.115337%) 20.0 : 30.0 - 603 ( 0.009300%) 30.0 : 40.0 - 121 ( 0.001866%) 40.0 : 50.0 - 49 ( 0.000756%) 50.0 : 60.0 - 13 ( 0.000201%) 60.0 : 70.0 - 2 ( 0.000031%) 70.0 : 80.0 - 0 ( 0.000000%) 80.0 : 90.0 - 0 ( 0.000000%) 90.0 : 100.0 - 0 ( 0.000000%)
0.125x0.125	Maximum difference = 92.937500 Minimum difference = -80.062500 Mean absolute difference = 0.297040 Median absolute difference = 0.062500 Standard deviation = 1.112258 RMS of differences = 1.112258 Percentage of points with absolute difference < 1.0 = 95.244% < 2.0 = 97.784% < 10.0 = 99.717%	-100.0 : -90.0 - 0 ( 0.000000%) -90.0 : -80.0 - 1 ( 0.000024%) -80.0 : -70.0 - 3 ( 0.000072%) -70.0 : -60.0 - 10 ( 0.000241%) -60.0 : -50.0 - 7 ( 0.000169%) -50.0 : -40.0 - 26 ( 0.000626%) -40.0 : -30.0 - 84 ( 0.002024%) -30.0 : -20.0 - 387 ( 0.009325%) -20.0 : -10.0 - 5446 ( 0.131226%) -10.0 : 0.0 - 2862191 ( 68.967128%) 0.0 : 10.0 - 1276136 ( 30.749672%) 10.0 : 20.0 - 5303 ( 0.127781%) 20.0 : 30.0 - 362 ( 0.008723%) 30.0 : 40.0 - 81 ( 0.001952%) 40.0 : 50.0 - 28 ( 0.000675%) 50.0 : 60.0 - 9 ( 0.000217%) 60.0 : 70.0 - 2 ( 0.000048%) 70.0 : 80.0 - 3 ( 0.000072%) 80.0 : 90.0 - 0 ( 0.000000%) 90.0 : 100.0 - 1 ( 0.000024%)
0.25x0.25	Maximum difference = 92.875000 Minimum difference = -61.875000 Mean absolute difference = 0.338583 Median absolute difference = 0.125000 Standard deviation = 1.266861 RMS of differences = 1.266861 Percentage of points with absolute difference < 1.0 = 95.149% < 2.0 = 97.663% < 10.0 = 99.580%	-100.0 : -90.0 - 0 ( 0.000000%) -90.0 : -80.0 - 0 ( 0.000000%) -80.0 : -70.0 - 0 ( 0.000000%) -70.0 : -60.0 - 4 ( 0.000385%) -60.0 : -50.0 - 4 ( 0.000385%) -50.0 : -40.0 - 6 ( 0.000578%) -40.0 : -30.0 - 15 ( 0.001445%) -30.0 : -20.0 - 101 ( 0.009728%) -20.0 : -10.0 - 2043 ( 0.196775%) -10.0 : 0.0 - 527362 ( 50.793843%) 0.0 : 10.0 - 506516 ( 48.786022%) 10.0 : 20.0 - 2066 ( 0.198991%) 20.0 : 30.0 - 93 ( 0.008957%) 30.0 : 40.0 - 19 ( 0.001830%) 40.0 : 50.0 - 6 ( 0.000578%) 50.0 : 60.0 - 2 ( 0.000193%) 60.0 : 70.0 - 1 ( 0.000096%) 70.0 : 80.0 - 1 ( 0.000096%) 80.0 : 90.0 - 0 ( 0.000000%) 90.0 : 100.0 - 1 ( 0.000096%)
0.5x0.5	Maximum difference = 51.000000 Minimum difference = -61.000000 Mean absolute difference = 0.309541 Median absolute difference = 0.000000 Standard deviation = 1.523147 RMS of differences = 1.523153 Percentage of points with absolute difference < 1.0 = 94.304% < 2.0 = 97.268% < 10.0 = 99.306%	-70.0 : -60.0 - 2 ( 0.000769%) -60.0 : -50.0 - 1 ( 0.000385%) -50.0 : -40.0 - 1 ( 0.000385%) -40.0 : -30.0 - 3 ( 0.001154%) -30.0 : -20.0 - 21 ( 0.008079%) -20.0 : -10.0 - 855 ( 0.328947%) -10.0 : 0.0 - 41886 ( 16.114958%) 0.0 : 10.0 - 216238 ( 83.194060%) 10.0 : 20.0 - 871 ( 0.335103%) 20.0 : 30.0 - 33 ( 0.012696%) 30.0 : 40.0 - 6 ( 0.002308%) 40.0 : 50.0 - 2 ( 0.000769%) 50.0 : 60.0 - 1 ( 0.000385%) 60.0 : 70.0 - 0 ( 0.000000%)
1.0x1.0	Maximum difference = 50.937500 Minimum difference = -60.812500 Mean absolute difference = 0.437874 Median absolute difference = 0.062500 Standard deviation = 1.932739 RMS of differences = 1.932777 Percentage of points with absolute difference < 1.0 = 94.672% < 2.0 = 96.980% < 10.0 = 98.766%	-70.0 : -60.0 - 1 ( 0.001535%) -60.0 : -50.0 - 0 ( 0.000000%) -50.0 : -40.0 - 0 ( 0.000000%) -40.0 : -30.0 - 0 ( 0.000000%) -30.0 : -20.0 - 2 ( 0.003069%) -20.0 : -10.0 - 389 ( 0.596992%) -10.0 : 0.0 - 44619 ( 68.476059%) 0.0 : 10.0 - 19737 ( 30.290055%) 10.0 : 20.0 - 401 ( 0.615408%) 20.0 : 30.0 - 9 ( 0.013812%) 30.0 : 40.0 - 1 ( 0.001535%) 40.0 : 50.0 - 0 ( 0.000000%) 50.0 : 60.0 - 1 ( 0.001535%) 60.0 : 70.0 - 0 ( 0.000000%)