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Changes to ECMWF's grids in 2016

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Gaussian <strong>grids</strong> of order N<br />

Regular (full) grid<br />

No po<strong>in</strong>t at pole<br />

Orig<strong>in</strong>al reduced grid<br />

N latitude l<strong>in</strong>es<br />

between pole and<br />

equa<strong>to</strong>r<br />

Latitude l<strong>in</strong>es not<br />

evenly spaced<br />

No latitude l<strong>in</strong>e at equa<strong>to</strong>r<br />

4N longitude po<strong>in</strong>ts at each latitude<br />

Symmetric about equa<strong>to</strong>r<br />

4N longitude po<strong>in</strong>ts close <strong>to</strong> equa<strong>to</strong>r<br />

Fewer longitude po<strong>in</strong>ts <strong>to</strong>wards poles<br />

EUROPEAN CENTRE FOR MEDIUM-RANGE WEATHER FORECASTS<br />

Oc<strong>to</strong>ber 29, 2014<br />

3

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