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Technical Report No. ? - DKRZ

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3.3 THE GRIB-FORMAT<br />

<strong>DKRZ</strong> GRIB/EXTRA Format Module Documentation<br />

The programs described below use the following specifications.<br />

- TYPE Data representation type<br />

0 latitude / longitude grid<br />

4 gaussian latitude / longitude grid<br />

-4 0 or 4<br />

50 spherical harmonic coefficients<br />

-1 any<br />

- TIME Time step number<br />

Time steps have decimal format YYMMDDHH<br />

Day of year is specified as MMDD, hour of day as HH, etc.<br />

Time ranges are specified as parameters NT1 and NT2.<br />

- CODE Data code, please refer to Table 1.<br />

Codes greater than 256 are folded to fit in one byte.<br />

Programs treat codes equal, if they have equivalent representation, e.g. codes 263 and 7 match.<br />

- LEVEL Either Isobaric level, pressure specified in hPa, or Sigma level number.<br />

Ranges are specified as parameters LV1 and LV2.<br />

For full details about the internal byte structure of grib code data see inline comments of the conversion<br />

program package and the appropriate pages of documentation ‘MARS USER GUIDE’.<br />

PAGE 3.3.1

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