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40 lines
1.9 KiB
Markdown
40 lines
1.9 KiB
Markdown
# [StdConvert]
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The `StdConvert` service acts as a filter for units, converting the unit
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system coming off your hardware to a target output unit system. All downstream
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services, including the archiving service, will then see this unit system.
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Hence, your data will be stored in the database using whatever unit system
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you specify here.
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*Once chosen, the unit system in the database cannot be changed!*
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WeeWX does not allow you to mix unit systems within the databases. You must
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choose a unit system and then stick with it. This means that users coming from
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wview (which uses US Customary) should not change the default setting. Having
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said this, there is a way of reconfiguring the database to use another unit
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system. See the section [*Changing the unit system in an existing
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database*](../../custom/database.md#change-unit-system) in the
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*Customization Guide*.
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!!! note
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This service only affects the units used in the databases. In particular,
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it has nothing to do with what units are displayed in plots or files.
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Those units are specified in the skin configuration file, as described
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in the *Customization Guide*, under section
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[*Changing unit systems*](../../custom/custom-reports.md#changing-unit-systems).
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Because of this, unless you have a special purpose application, there is
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really no good reason to change from the default, which is `US`.
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!!! Warning
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If, despite these precautions, you do decide to change the units of data
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stored in the database, be sure to read the sections `[StdCalibrate]` and
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`[StdQC]`, and change the units there as well!
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#### target_unit
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Set to either `US`, `METRICWX`, or `METRIC`. The difference between `METRICWX`
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and `METRIC` is that the former uses `mm` instead of `cm` for rain, and `m/s`
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instead of `km/hr` for wind speed. See the reference section
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[*Units*](../units.md) for the exact differences beween each of these options.
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Default is `US`. |