Thursday, January 12, 2017

A PowerShell function to translate wind speed to Beaufort scale numbers

While last week I have shown you how to write a PowerShell function aimed at converting the direction of wind in degrees to the italianate wind name, this time I am introducing a function, called Get-WindForce that translates the speed of the wind in m/s to a readable description taken from the Beaufort Scale.

While the function that I wrote last week uses the Italian wind names of Medieval origin, which aren't translated because they have become an international standard still used nowadays, the function that gives you a description of the wind force has to be developed in a way to return the information in the language of the reader.

That's why I had to add a -Language optional parameter that tells the function the language you want to use in the output. Based on the passed value it relies on the Switch statement to choose the proper values to display:

Then it uses again the Switch statement to pick the description in the given language:

Nothing especially difficult here, apart from the fact that it took quite a bit of typing to get all the possible wind speeds and descriptions in the four languages that I have pre-loaded in my function; English, Italian, French and German.

Here's the full code of my function:

function Get-WindForce {

   Returns wind force from speed in m/s
   Returns wind force in a give language from speed in m/s
   Get-WindForce -speed 2 -language EN
   Get-WindForce -speed 31.5 -language IT
    15,40 | Get-WindForce -Language FR -Verbose
        # Speed of wind in m/s

        # Language to use for the output of the wind force
        [string]$Language = 'EN'
    Process {
        Write-Verbose "working on $speed m/s"
        $windforce = switch ($speed) {
            {$_ -lt 0.3} { @('Calm','Calma','Calme','WindStille') }
            {($_ -ge 0.3) -and ($_ -le 1.5)} { @('Light air','Bava di vento','Très légère brise','Leichter Zug') }
            {($_ -ge 1.6) -and ($_ -le 3.3)} { @('Light breeze','Brezza leggera','Légère brise','Leichte Brise') }
            {($_ -ge 3.4) -and ($_ -le 5.5)} { @('Gentle breeze','Brezza testa','Petite brise','Schwache Brise') }
            {($_ -ge 5.6) -and ($_ -le 7.9)} { @('Moderate breeze','Vento moderato','Jolie brise','Mäßige Brise') }
            {($_ -ge 8) -and ($_ -le 10.7)} { @('Fresh breeze','Vento teso','Bonne brise','Frische Brise') }
            {($_ -ge 10.8) -and ($_ -le 13.8)} { @('Strong breeze','Vento fresco','Vent frais','Starker Wind') }
            {($_ -ge 13.9) -and ($_ -le 17.1)} { @('Near gale','Vento forte','Grand frais','Steifer Wind') } 
            {($_ -ge 17.2) -and ($_ -le 20.7)} { @('Gale','Burrasca','Coup de vent','Stürmischer Wind') }
            {($_ -ge 20.8) -and ($_ -le 24.4)} { @('Strong gale','Burrasca forte','Fort coup de vent','Sturm') }
            {($_ -ge 24.5) -and ($_ -le 28.4)} { @('Storm','Tempesta','Tempête','Schwerer Sturm') }
            {($_ -ge 28.5) -and ($_ -le 32.6)} { @('Violent storm','Fortunale','Violent tempête','Orkanartiger Sturm') }
            {$_ -ge 32.7} { @('Hurricane','Uragano','Ouragan','Orkan') }
            default { 'NA','NA','NA','NA' }

        Write-Verbose "Printing in choosen language: $Language"
        switch ($language) {
            'EN' {$windforce[0]}
            'IT' {$windforce[1]}
            'FR' {$windforce[2]}
            'DE' {$windforce[3]}
            Default {$windforce[0]}


Feel free to adapt this function to you own language. In my case I am using this function as an additional function to the module I am writing to manage my pellet stove. To be more specific, I am using those few lines of code to translate the raw information I get from an external weather data provider, but I'll talk about that part in a future post. Stay tuned for more PowerShell for Domotics!

UPDATE: It looks like my function has been improved: check out MCT Carnegie Johnson version on Github.

1 comment:

  1. Cool function. I extended it through implementation of System.Globalization namespace and Hasthtable of specific cultural strings locale ID.

    See code revision on GitHub,


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