Description
Geopotential height for standard levels is encoded in only 3 digits in TEMP messages. To enable this, height is recorded in decameters above the 700 hPa level and the thousands digit is left off, as it can be determined from the standard atmosphere.
Formula
| Standard level | Height given in unit | Value < 500 | Value > 500 |
|---|---|---|---|
| 1000 hPa | m | Treat as negative | |
| 920 hPa | m | ||
| 850 hPa | m | +1000m | +1000m |
| 700 hPa | m | +3000m | +2000m |
| 500 hPa | decameters | ||
| 400 hPa | decameters | ||
| 300 hPa | decameters | +10000m | |
| 250 hPa | decameters | +10000m | |
| 200 hPa | decameters | +10000m | +10000m |
| 150 hPa | decameters | +10000m | +10000m |
| 100 hPa | decameters | +10000m | +10000m |
| 70 hPa | decameters | +10000m | +10000m |
| 50 hPa | decameters | +20000m | +10000m |
| 30 hPa | decameters | +20000m | +20000m |
| 20 hPa | decameters | +20000m | +20000m |
| 10 hPa | decameters | +30000m | +20000m |
| 7 hPa | decameters | +30000m | +30000m |
| 5 hPa | decameters | +30000m | +30000m |
| 3 hPa | decameters | +40000m | +30000m |
| 2 hPa | decameters | +40000m | +30000m |
| 1 hPa | decameters | +50000m | +40000m |
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