Wind directions for airborne spread are misleading

Component:User interface
Category:bug report

NOTE: Wind direction is always reported as the direction from which the wind is blowing outside of NAADSM, i.e. National Weather Service, All Nautical and Aeronautical communities, etc.

In NAADSM wind direction must be assumed to indicate, as the circle on that screen seems to indicate, the direction to which it will blow, when the wind is blowing, i.e. the "fallout" of spread from the unit, which the center of the circle seems to represent.

Otherwise the circle representation makes no sense since it would inidicate that somehow the winds converge on a point and go nowhere after that.

Since that parameter input screen does not mention that NAADSM does not follow standard convention, the user could easily become confused about this parameter.  (Are we following standard convention?  If so, then we need to alter the graphical representation.)

Suggested fix: Either explain in detail on the input screen that NAADSM does not use standard conventions, or use a different picture scheme to illustrate the values that the user has chosen. (See example of potential graphical method of display attached)

Wind Direction Sample.png9.57 KB



Yes, the use of the phrase "wind direction" on that parameter screen is misleading. Figure A4-5 in the Users Guide explicitly shows the infected farm at the center of the circle, and describes the two parameters as the start and end of the area affected by airborne spread.

Perhaps the parameter screen can be adapted to look more like Figure A4-5, explicitly label the "infected unit" and "affected area", and use the terminology "start of affected area" and "end of affected area" instead of "wind direction"?


(The figure number was A4-5 in the model spec for NAADSM 3.2 -- it's A4-6, "Example parameters for north winds (left) and south winds (right)", in the model spec for NAADSM 4.0. Sorry!)


Priority:not yet set» low
Assigned to:guest»

Any changes will also need to be ported to versions 3.1, 3.2, and 5.


The attached png incorporates suggestions by Neil. Will this sufffice? Thanks.

AirborneSpreadDepositionArea.png 6.89 KB


Now that 3.2 is out, I suggest that 3.1 should be treated as "no longer supported". We should apply whatever patch we come up with to versions 3.2 and 5. (3.2 and 4.0 will likely be supported in parallel for a while yet.)

Other thoughts/comments?


In an email conversation today with Neil and Shaun, Shaun had similar point of view. I agree too, but I wondered if we have a responsability to let the public know that v 3.1 is now deprecated and maintanence has ceased. That way there is no misunderstanding and more motivation on their part to download and begin using 3.2.

Regarding the fix for this issue, Neil is writing an RFC such that the phrasing in the specification and the GUI will match. After it is circulated to the team and approved I was going to make the changes to 3.2 and 5, and I suppose their specs also would need to be updated. The attached png depicts the changes in terminology.

I was unsure whether to add these phrases to the caption language database now or wait until we see the outcome of the RFC approval.

AirborneSpreadDepositionArea.png 5.19 KB


Status:active» needs review


Status:needs review» fixed

Updated the terminology in accordance with RFC-20110705NH-RenameWindDirection. Will also update 3Line and 5Line and add the new phrases to the translation dictionary.


Status:fixed» closed


Assigned to:» guest
Status:closed» active

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