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Unit Conversions

CDIP archives its data in metric units. In the website's Recent-Observed section - which displays the latest data from currently active stations - a number of products can be viewed using either English or metric units. On the nowcast swell models and forecast models English units are used, with wave heights measured in feet. Everywhere else on the site, metric units are used. Below is some conversion information that may help in interpreting data.

Length conversions

The primary unit of length used by CDIP is meters(m). To convert from meters to feet, the formula is as follows:
    (feet) = 3.28 * (meters)

Meters to Feet Conversion Table
m 1 2 3 4 5 6 7 8 9 10 11 12
ft 3.3 6.6 9.8 13.1 16.4 19.7 23.0 26.2 29.5 32.8 36.1 39.4

When describing station locations and on maps, distances may given in miles(mi), nautical miles(nm), or kilometers(km). The conversions between these units are as follows:
    1 mi = 1.61 km = 0.87 nm

Temperature conversions

The temperature unit used by CDIP is degrees Celsius(C). To convert from Celsius to Farenheit(F), the formula is as follows:
    (F) = (9/5)*(C) + 32

Celcius to Farenheit Conversion Table
C 10° 15° 20° 25° 30° 35° 40° 45° 50° 55°
F 32° 41° 50° 59° 68° 77° 86° 95° 104° 113° 122° 131°

Other conversions

Wind speed is archived in meters per second (m/s).
    1 m/s = 1.94 knots = 2.24 miles per hour

Pressure is archived in millibars (mB).
    1 mB = 0.0295 inches of Hg


CDIP's major funding contributors are the US Army Corps of Engineers and the California Department of Boating and Waterways.
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