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Re: Direction of Wind Vectors: A bug? [message #90288 is a reply to message #90287]

Wed, 18 February 2015 11:23

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Wednesday, February 18, 2015 at 1:32:50 PM UTC-5, David Fanning wrote:

> So, here is my question. Are both of these programs "right"? If not, why
> not? And, which would convey the "true wind direction" more convincingly
> on a plot?

I'd vote for the partvelvec.pro approach where the angle -- like everything else on the map -- is distorted by the unequal projections.

However, in a similar case I chose the opposite approach -- in my tvcircle.pro I have the comment

"TVCIRCLE always draws a circle --- even when in data coordinates and the X and Y data scales are unequal. (The X data scale is used to define the circle radius.) If this is not the behavior
you want, then use TVELLIPSE instead."

In any case, the behavior of the program should be documented (which partvelvec.pro currently isn't), and perhaps a keyword could be added to let the user choose which approach he wants.

--Wayne

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[Message index]

		Direction of Wind Vectors: A bug? By: David Fanning on Wed, 18 February 2015 10:32
		Re: Direction of Wind Vectors: A bug? By: wlandsman on Wed, 18 February 2015 11:23
		Re: Direction of Wind Vectors: A bug? By: David Fanning on Wed, 18 February 2015 11:44
		Re: Direction of Wind Vectors: A bug? By: natha on Wed, 18 February 2015 12:04
		Re: Direction of Wind Vectors: A bug? By: David Fanning on Wed, 18 February 2015 12:09
		Re: Direction of Wind Vectors: A bug? By: Paul Van Delst[1] on Wed, 18 February 2015 12:25
		Re: Direction of Wind Vectors: A bug? By: David Fanning on Wed, 18 February 2015 12:46
		Re: Direction of Wind Vectors: A bug? By: David Fanning on Wed, 18 February 2015 14:23
		Re: Direction of Wind Vectors: A bug? By: Fabzi on Wed, 18 February 2015 14:27
		Re: Direction of Wind Vectors: A bug? By: David Fanning on Wed, 18 February 2015 14:44
		Re: Direction of Wind Vectors: A bug? By: David Fanning on Mon, 23 February 2015 07:28

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