[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[IDV #RVK-621478]: McIDAS-V inquiry #1048 updated

> 
> Thanks for the update, and I think you summarized the problem correctly.
> 
> Can you give me examples of the other meteorological visualization
> packages that plot the wind barbs that way?  Every reference that we
> found for the WMO standard is to plot winds less than 3 kt as a barb
> with no flags rather than as a circle.
> 
> - Becky
> 

I think this one is done and I am closing this ticket


Yuan
> 
> On 9/29/2011 11:18 AM, Unidata IDV Support wrote:
> > Dear Becky,
> >
> > This thread is getting rather long, so just for clarification, as far as I 
> > can tell, wind barbs are plotted consistently between the plan view and the 
> > time series plots. Let me know if you see otherwise.
> >
> > On the issue of low-speed winds, wind barbs have been plotted in the IDV 
> > plan view in this fashion for ~10 years. Therefore, I am reluctant to make 
> > any changes without very good reason. I believe the IDV wind barbs are 
> > consistent with other meteorological visualization packages.
> >
> > Best Regards,
> > Unidata IDV Support
> >
> >>
> >>
> >>
> >>
> >>
> >> Hello again! 
> >>
> >> Here's one more that I sent a few weeks ago, but haven't seen a
> >> response.  Julien did some initial work to get the layer controls
> >> and main display plotting the same, but our testers have found that
> >> the WMO standard is to plot winds less than 3 kt as a barb with no
> >> flags rather than a circle.   Have you had a chance to look into 
> >> it
> >> again?
> >>
> >> Thanks!
> >> Becky
> >>
> >> On 9/7/2011 2:06 PM, McIDAS Help Desk wrote:
> >>
> >>
> >>
> >> Can you update us on the status of this ticket?   It's more of a
> >> standard for winds less than 3kts to be plotted as a barb with no
> >> flags, but now it's plotted as a circle.  Can you switch it so
> >> that both the layer controls and main display plot these as a barb
> >> with no flags?
> >>
> >>
> >>
> >>
> >>
> >>
> >> -------- Original Message --------
> >>
> >>
> >>
> >> Subject:
> >>
> >>
> >> Re: [IDV #RVK-621478]: McIDAS-V inquiry #1048 updated
> >>
> >>
> >> Date:
> >>
> >> Fri, 05 Aug 2011 09:14:36 -0500
> >>
> >>
> >> From:
> >>
> >> Bob Carp<address@hidden>
> >>
> >>
> >> To:
> >> address@hidden
> >>
> >>
> >> CC:
> >> address@hidden
> >>
> >>
> >>
> >>
> >>
> >> Hi -
> >>
> >> Sorry for the delayed response. I was looking into this issue myself,
> >> and I have found a few reliable sources that state that wind barbs for
> >> winds of less than 3kts are plotted as a barb with no flags. Below are
> >> some of the places I saw that reference this:
> >>
> >> Training course from the United States Navy (page 165 in the chart)
> >> http://www.hnsa.org/doc/pdf/aerographer1.pdf
> >>
> >> Applied Atmospheric Dynamics (Text book, pages 7 - 8)
> >> http://books.google.com/books?id=7IsmskcU3msC&pg=PA7&lpg=PA7&dq=wind+barb+1kt+wind&source=bl&ots=5sazNCEaT-&sig=V58M9VOKCKeDrTY8liAyTP89Dco&hl=en&ei=4hUwTvr0MYiwsAKF4KBZ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CC0Q6AEwAw#v=onepage&q=wind%20barb%201kt%20wind&f=false
> >>
> >> University of Washington
> >> http://www.atmos.washington.edu/mm5rt/descript/definitions/windbarbs.html
> >>
> >> MAV MOS wind barbs from the NWS shows barbs without any flags on them
> >> http://www.nws.noaa.gov/mdl/forecast/graphics/MAV/MAV.BRBK_000.html
> >>
> >> Thanks
> >> Bob
> >>
> >> On 7/28/2011 2:15 PM, Unidata IDV Support wrote:
> >> > Bob,
> >> >
> >> > The wind barbs are now consistent between plots and views. Please get 
> >> the nightly build tomorrow to confirm.
> >> >
> >> > Best Regards,
> >> >
> >> > -Unidata IDV Support
> >> >
> >> >> Bob,
> >> >>
> >> >> I could be wrong, but here is my analysis of the situation which 
> >> is backwards from yours.
> >> >>
> >> >> First off, people appear to deal with wind barbs in knots rather 
> >> than meters per second.
> >> >>
> >> >> Second, my understanding is that wind speeds from 0 to 5 knots 
> >> are calm represented by a circle. After that, (i.e.>= 5 knots), we 
> >> start to see lines with barbs attached. The map view wind barbs, rendered 
> >> with VisAD, seem to do this correctly. Strictly speaking, as far as I can 
> >> tell, there is no wind barb line without a barb.
> >> >>
> >> >> In conclusion, I think the Map View of wind barbs are correct, 
> >> but the Dashboard Plot does not deal with calm wind speeds correctly. I 
> >> would recommend fixing the Dashboard plots of wind barbs for low wind 
> >> speeds.
> >> >>
> >> >> Best Regards,
> >> >>
> >> >> -Unidata IDV Support
> >> >>
> >> >>> While in most cases this problem appears to be fixed, there 
> >> is still an issue when a station is reading 1 m/s wind. When this is the 
> >> case, the plot in the Main Display Window shows an open circle, while the 
> >> plot in the Layer Controls (Displays) tab displays a barb without any 
> >> flags. However, the barb in the Layer Controls (Displays) tab does point 
> >> the proper direction with respect to the wind direction reported.
> >> >>>
> >> >>> This is a case where the barb is plotted correctly in the 
> >> Layer Controls (Displays) tab and not in the Main Display Window. This is 
> >> the only circumstance where I could find any inconsistency between the two 
> >> displays.
> >> >>>
> >> >>> ----==== Inquiry ====----
> >> >>> 1048
> >> >>>
> >> >>> ----==== Summary ====----
> >> >>> Point data wind barbs differ between map display and plot in 
> >> layer controls
> >> >>>
> >> >>>
> >> >>> 
> >> ################################################################################
> >> >>>
> >> >>> http://dcdbs.ssec.wisc.edu/inquiry-v/index.php?inquiry=1048
> >> >>>
> >> >>>
> >> >
> >> > Ticket Details
> >> > ===================
> >> > Ticket ID: RVK-621478
> >> > Department: Support IDV
> >> > Priority: Normal
> >> > Status: Closed
> >> >
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: RVK-621478
> > Department: Support IDV
> > Priority: Critical
> > Status: Closed
> >
> 
> 


Ticket Details
===================
Ticket ID: RVK-621478
Department: Support IDV
Priority: Critical
Status: Closed