Convert wind direction degrees to N,S, etc

[David Edelman]

I have a signal that gives the wind direction in degrees from North (0-360). I want to convert a range of values to a cardinal direction, so I used "toStates" with a custom group to do so

$wind_dir = group(
capsule(0, 22.5).setProperty('Value', 'N'),
capsule(22.5, 67.5).setProperty('Value', 'NE'),
capsule(67.5, 112.5).setProperty('Value', 'E'),
capsule(112.5, 158.5).setProperty('Value', 'SE'),
capsule(158.5, 202.5).setProperty('Value', 'S'),
capsule(202.5, 247.5).setProperty('Value', 'SW'),
capsule(247.5, 292.5).setProperty('Value', 'W'),
capsule(292.5, 337.5).setProperty('Value', 'NW'),
capsule(337.5, 360).setProperty('Value', 'N')
)

$w0wd.toStates($wind_dir)

This formula works, but the Y axis is sorted alphabetically (W, SW, SE, S, etc). Can I force a particular sorting (N, NE, E, etc) or is there a different/better way to implement the above?

 

Thanks,

David

[James DeMarco]

If you modify your

wind_dir

variable to 

$wind_dir = group(
capsule(0, 22.5).setProperty('Value', 'ENUM{{0|N}}'),
capsule(22.5, 67.5).setProperty('Value', 'ENUM{{1|NE}}'),
capsule(67.5, 112.5).setProperty('Value', 'ENUM{{2|E}}'),
capsule(112.5, 158.5).setProperty('Value', 'ENUM{{3|SE}}'),
capsule(158.5, 202.5).setProperty('Value', 'ENUM{{4|S}}'),
capsule(202.5, 247.5).setProperty('Value', 'ENUM{{5|SW}}'),
capsule(247.5, 292.5).setProperty('Value', 'ENUM{{6|W}}'),
capsule(292.5, 337.5).setProperty('Value', 'ENUM{{7|NW}}'),
capsule(337.5, 360).setProperty('Value', 'ENUM{{8|N}}')
)

You will get an ordered Y axis:

This is how Seeq handles enum Signal values from other systems - it has some limitations, but it seems like it should work well for your use case.

[David Edelman]

That worked great - thanks!