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360 lines
9.8 KiB
Markdown
360 lines
9.8 KiB
Markdown
# Units
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WeeWX offers three different *unit systems*:
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<table>
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<caption>The standard unit systems used within WeeWX</caption>
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<tr>
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<th>Name</th>
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<th>Encoded value</th>
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<th>Description</th>
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</tr>
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<tr>
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<td class="first_col code">US</td>
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<td>0x01</td>
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<td>U.S. Customary</td>
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</tr>
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<tr>
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<td class="first_col code">METRICWX</td>
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<td>0x11</td>
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<td>Metric, with rain related measurements in <span class="code">mm</span> and speeds in <span
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class="code">m/s</span>
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</td>
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</tr>
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<tr>
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<td class="first_col code">METRIC</td>
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<td>0x10</td>
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<td>Metric, with rain related measurements in <span class="code">cm</span> and speeds in <span
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class="code">km/hr</span>
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</td>
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</tr>
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</table>
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The table below lists all the unit groups, their members, which units
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are options for the group, and what the defaults are for each standard
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unit system.
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<table>
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<caption>Unit groups, members and options</caption>
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<tbody class="code">
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<tr>
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<th>Group</th>
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<th>Members</th>
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<th>Unit options</th>
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<th><span class="code">US</span></th>
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<th><span class="code">METRICWX</span></th>
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<th><span class="code">METRIC</span></th>
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</tr>
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<tr>
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<td class="first_col">group_altitude</td>
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<td>altitude<br/> cloudbase
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</td>
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<td>foot <br/> meter
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</td>
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<td>foot</td>
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<td>meter</td>
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<td>meter</td>
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</tr>
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<tr>
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<td class="first_col">group_amp</td>
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<td></td>
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<td>amp</td>
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<td>amp</td>
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<td>amp</td>
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<td>amp</td>
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</tr>
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<tr>
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<td class="first_col">group_angle</td>
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<td></td>
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<td>degree_angle<br/>radian</td>
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<td>degree_angle</td>
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<td>degree_angle</td>
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<td>degree_angle</td>
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</tr>
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<tr>
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<td class="first_col">group_boolean</td>
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<td></td>
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<td>boolean</td>
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<td>boolean</td>
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<td>boolean</td>
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<td>boolean</td>
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</tr>
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<tr>
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<td class="first_col">group_concentration</td>
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<td>no2<br/>pm1_0<br/>pm2_5<br/>pm10_0</td>
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<td>microgram_per_meter_cubed</td>
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<td>microgram_per_meter_cubed</td>
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<td>microgram_per_meter_cubed</td>
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<td>microgram_per_meter_cubed</td>
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</tr>
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<tr>
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<td class="first_col">group_count</td>
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<td>leafWet1<br/>leafWet2<br/>lightning_disturber_count<br/>lightning_noise_count<br/>lightning_strike_count<br/></td>
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<td>count</td>
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<td>count</td>
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<td>count</td>
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<td>count</td>
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</tr>
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<tr>
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<td class="first_col">group_data</td>
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<td></td>
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<td>byte<br/> bit</td>
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<td>byte</td>
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<td>byte</td>
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<td>byte</td>
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</tr>
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<tr>
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<td class="first_col">group_db</td>
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<td>noise</td>
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<td>dB</td>
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<td>dB</td>
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<td>dB</td>
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<td>dB</td>
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</tr>
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<tr>
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<td class="first_col">group_deltatime</td>
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<td>daySunshineDur<br/>rainDur<br/>sunshineDurDoc</td>
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<td>second<br/> minute<br/>hour<br/>day<br/></td>
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<td>second</td>
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<td>second</td>
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<td>second</td>
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</tr>
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<tr>
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<td class="first_col">group_degree_day</td>
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<td>cooldeg<br/> heatdeg<br/> growdeg
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</td>
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<td>degree_F_day<br/> degree_C_day</td>
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<td>degree_F_day</td>
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<td>degree_C_day</td>
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<td>degree_C_day</td>
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</tr>
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<tr>
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<td class="first_col">group_direction</td>
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<td>gustdir <br/> vecdir <br/> windDir <br/> windGustDir</td>
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<td>degree_compass</td>
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<td>degree_compass</td>
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<td>degree_compass</td>
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<td>degree_compass</td>
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</tr>
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<tr>
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<td class="first_col">group_distance</td>
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<td>windrun<br/>lightning_distance</td>
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<td>mile<br/>km</td>
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<td>mile</td>
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<td>km</td>
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<td>km</td>
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</tr>
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<tr>
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<td class="first_col">group_energy</td>
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<td></td>
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<td>kilowatt_hour<br/>mega_joule<br/>watt_hour<br/>watt_second</td>
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<td>watt_hour</td>
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<td>watt_hour</td>
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<td>watt_hour</td>
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</tr>
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<tr>
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<td class="first_col">group_energy2</td>
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<td></td>
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<td>kilowatt_hour<br/>watt_hour<br/>watt_second</td>
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<td>watt_second</td>
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<td>watt_second</td>
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<td>watt_second</td>
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</tr>
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<tr>
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<td class="first_col">group_fraction</td>
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<td>co<br/>co2<br/>nh3<br/>o3<br/>pb<br/>so2</td>
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<td>ppm</td>
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<td>ppm</td>
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<td>ppm</td>
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<td>ppm</td>
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</tr>
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<tr>
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<td class="first_col">group_frequency</td>
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<td></td>
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<td>hertz</td>
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<td>hertz</td>
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<td>hertz</td>
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<td>hertz</td>
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</tr>
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<tr>
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<td class="first_col">group_illuminance</td>
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<td>illuminance</td>
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<td>lux</td>
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<td>lux</td>
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<td>lux</td>
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<td>lux</td>
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</tr>
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<tr>
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<td class="first_col">group_interval</td>
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<td>interval</td>
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<td>minute</td>
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<td>minute</td>
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<td>minute</td>
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<td>minute</td>
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</tr>
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<tr>
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<td class="first_col">group_length</td>
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<td></td>
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<td>inch<br/> cm
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</td>
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<td>inch</td>
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<td>cm</td>
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<td>cm</td>
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</tr>
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<tr>
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<td class="first_col">group_moisture</td>
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<td>soilMoist1 <br/> soilMoist2 <br/> soilMoist3 <br/> soilMoist4
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</td>
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<td>centibar</td>
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<td>centibar</td>
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<td>centibar</td>
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<td>centibar</td>
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</tr>
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<tr>
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<td class="first_col">group_percent</td>
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<td>
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cloudcover<br/>extraHumid1 <br/> extraHumid2 <br/> inHumidity <br/> outHumidity <br/>pop<br/>
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rxCheckPercent<br/>snowMoisture
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</td>
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<td>percent</td>
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<td>percent</td>
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<td>percent</td>
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<td>percent</td>
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</tr>
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<tr>
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<td class="first_col">group_power</td>
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<td></td>
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<td>kilowatt<br/>watt</td>
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<td>watt</td>
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<td>watt</td>
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<td>watt</td>
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</tr>
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<tr>
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<td class="first_col">group_pressure</td>
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<td>
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barometer <br/> altimeter <br/> pressure
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</td>
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<td>
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inHg<br/>mbar<br/>hPa<br/>kPa
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</td>
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<td>inHg</td>
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<td>mbar</td>
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<td>mbar</td>
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</tr>
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<tr>
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<td class="first_col">group_pressurerate</td>
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<td>
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barometerRate <br/> altimeterRate <br/> pressureRate
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</td>
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<td>
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inHg_per_hour <br/> mbar_per_hour <br/> hPa_per_hour <br/> kPa_per_hour
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</td>
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<td>inHg_per_hour</td>
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<td>mbar_per_hour</td>
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<td>mbar_per_hour</td>
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</tr>
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<tr>
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<td class="first_col">group_radiation</td>
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<td>maxSolarRad <br/> radiation</td>
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<td>watt_per_meter_squared</td>
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<td>watt_per_meter_squared</td>
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<td>watt_per_meter_squared</td>
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<td>watt_per_meter_squared</td>
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</tr>
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<tr>
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<td class="first_col">group_rain</td>
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<td>rain<br/>ET<br/>hail<br/>snowDepth<br/>snowRate</td>
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<td>inch <br/> cm <br/> mm
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</td>
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<td>inch</td>
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<td>mm</td>
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<td>cm</td>
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</tr>
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<tr>
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<td class="first_col">group_rainrate</td>
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<td>rainRate <br/> hailRate
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</td>
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<td>inch_per_hour <br/> cm_per_hour <br/> mm_per_hour
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</td>
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<td>inch_per_hour</td>
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<td>mm_per_hour</td>
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<td>cm_per_hour</td>
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</tr>
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<tr>
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<td class="first_col">group_speed</td>
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<td>wind <br/> windGust <br/> windSpeed <br/> windgustvec <br/> windvec
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</td>
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<td>mile_per_hour <br/> km_per_hour <br/> knot <br/> meter_per_second <br/> beaufort
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</td>
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<td>mile_per_hour</td>
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<td>meter_per_second</td>
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<td>km_per_hour</td>
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</tr>
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<tr>
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<td class="first_col">group_speed2</td>
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<td>rms <br/> vecavg
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</td>
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<td>mile_per_hour2 <br/> km_per_hour2 <br/> knot2 <br/> meter_per_second2
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</td>
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<td>mile_per_hour2</td>
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<td>meter_per_second2</td>
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<td>km_per_hour2</td>
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</tr>
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<tr>
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<td class="first_col">group_temperature</td>
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<td>appTemp <br/> dewpoint <br/> extraTemp1 <br/> extraTemp2 <br/> extraTemp3 <br/> heatindex <br/>
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heatingTemp <br/> humidex <br/> inTemp <br/> leafTemp1 <br/> leafTemp2 <br/> outTemp <br/> soilTemp1
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<br/> soilTemp2 <br/> soilTemp3 <br/> soilTemp4 <br/> windchill <br/> THSW
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</td>
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<td>degree_C<br/> degree_F <br/> degree_E<br/> degree_K
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</td>
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<td>degree_F</td>
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<td>degree_C</td>
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<td>degree_C</td>
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</tr>
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<tr>
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<td class="first_col">group_time</td>
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<td>dateTime</td>
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<td>unix_epoch <br/> dublin_jd
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</td>
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<td>unix_epoch</td>
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<td>unix_epoch</td>
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<td>unix_epoch</td>
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</tr>
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<tr>
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<td class="first_col">group_uv</td>
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<td>UV</td>
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<td>uv_index</td>
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<td>uv_index</td>
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<td>uv_index</td>
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<td>uv_index</td>
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</tr>
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<tr>
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<td class="first_col">group_volt</td>
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<td>consBatteryVoltage <br/> heatingVoltage <br/> referenceVoltage <br/> supplyVoltage
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</td>
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<td>volt</td>
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<td>volt</td>
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<td>volt</td>
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<td>volt</td>
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</tr>
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<tr>
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<td class="first_col">group_volume</td>
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<td></td>
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<td>cubic_foot<br/> gallon<br/> liter
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</td>
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<td>gallon</td>
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<td>liter</td>
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<td>liter</td>
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</tr>
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<tr>
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<td class="first_col">group_NONE</td>
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<td>NONE</td>
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<td>NONE</td>
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<td>NONE</td>
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<td>NONE</td>
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<td>NONE</td>
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</tr>
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</tbody>
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</table>
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