$unit tag formatting

[František Slimařík]

Hello,

I have question regarding tag $unit. When I have for example tag $unit.label.rain it will show me " mm". Is there any way how to show different type of unit in case I want to show snow in my highchart graph and use this tag option? Like $unit.label.rain.cm?

Thanks for answer.

[Tom Keffer]

Not understanding your question. The $unit tag is designed to retrieve the reporting unit being used by an observation type. Why would you want to retrieve something different?

If you want the value of a type in a different unit, you can do something like:

$day.rain.sum.cm

This will give the rain since midnight in cm. Is this what you are looking for?

-tk

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[gjr80]

I think, reading between the lines, the issue may be that the OP wants to include something like snow in a WeeWX generated data file to be used by Highcharts, but using cm instead of mm as (seemingly) used for rain. I would expect that instead of passing something like '23 cm' in a single field Highcharts would want the value 23 in one field and 'cm' in another. The former can be obtained (for example) via $day.snow.cm.raw or $day.snow.cm.format(add_label=False) but there is no tag to get the unit label for 'cm' when your default unit for group_rain is mm. The only solution I can think of short of digging into the WeeWX internals is some in-line python code that parses the result of $day.snow.cm. Or hardcoding cm, but that is rather limiting.

Gary

[Tom Keffer]

That makes sense, but then why not just use $unit.label.snow?

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[gjr80]

Because the unit group being applied to snow, group_rain, is set to ‘mm’ (presumably so that rain appears in the correct/preferred default units) so $unit.label.snow will result in ‘mm’.

Gary

[František Slimařík]

Hi Gary,

You got my point and you are also right that “hardcoding” will be probably the best option. Since I am not using default unit I would have to anyway format string and take it out with split() for example but it’s not worth of it. 

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[Tom Keffer]

Yes, but then snow should be measured in mm.

I can see an issue if you change units. That is, if you're doing something like $day.snow.sum.cm, then you want the appropriate unit label. 

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[gjr80]

That is exactly the issue; the OP wishes to generate a file that includes rain in mm and snow in cm with separate tags for each data value and corresponding unit. Presently I don’t believe that can be done with the existing tag system.

Gary