[IDV #HHW-840109]: IDV v4.1u1: 3-D flow vector plotting options

Dave,

> Unidata support,
> 
> I don’t know if comments/questions/potential bug reports like those below 
> should be submitted via the IDV Steering Committee email list or here. 
> Anyway, here goes:
> 
> — I see that the choices for plotting the derived quantity, “3-D Flow Vectors 
> (from U & V & W)”, are just two: “3D vector plan view” and “3D vector cross 
> section". 3D flow vectors might naturally be plotted over topography, too, 
> especially near the surface, where the flow approximately follows the 
> surface. (I’ve seen horizontal flow vectors plotted over steep topography, if 
> they point upslope, vanish under the topographic surface if a 0% transparency 
> color-fill contour plot of topography is also present, though the attached 
> bundle doesn’t seem to suffer from this problem for some reason. In theory, 
> if the aspect ratio of the 3-D flow vectors and the topography were the same, 
> then 3D vectors near the surface would lie approximately parallel to the 
> surface and hence wouldn’t disappear beneath them, even if they pointed 
> upslope.)

Yuan will look into this issue.


> 
> — If I check "View > Show > Display Scales”, then I can’t subsequently turn 
> display scales off by unchecking "View > Properties > Show Display Scales”.

This appears to be a bug. On the to do list.

> 
> — When I click on the “Vertical Range” icon (left-hand edge of the Map View 
> window), I see a “Visible” check box. I’m expecting to be able to check that 
> box and see a vertical scale, but nothing happens when I do that. The next 
> time I click on the icon, the “Visible” check box is unchecked again. I’d 
> like to be able to turn on the vertical scale without also turning on the 
> latitude and longitude scales along the edges of the plot domain.

This appears to be a bug. On the to do list.


> 
> — When I’ve got a data transect (vertical cross section) set up along with 
> plan views, and the transect crosses the domain at an angle other than 
> north/south or east/west, I’d like to have a way to specify a perspective 
> view that is perpendicular to the vertical cross section. I have been 
> clicking one of the standard N, S, E, or W perspective views and then trying 
> to rotate the perspective manually until it’s as nearly perpendicular to the 
> vertical cross section as I can get it, but this is awkward and unreliable. 
> If it isn’t pretty close to perpendicular, then contour labels in the 
> vertical cross section. become hard or impossible to read.

We suggest this is a feature requests that you can bring up with the steering 
committee.

> 
> — When I have contour line labeling set to “Label Every 2nd Line” (the 
> default?) and the base contour is set to an even humber initially, then 
> even-numbered contours are labeled. If I then reset the base contour to an 
> odd number, the contours continue to be labeled only on even-numbered 
> contours. It would be good if line labeling always started with the base 
> contour and went up and down from there in whatever increment is specified by 
> “Label Every Nth Line”.

We agree that there are some ambiguities with the contouring logic. We will 
have to work with SSEC to make progress on these issues.

> 
> I’ve attached a bundle during the development of which I encountered these 
> issues.
> 
> — Dave
> 
> 
> ****************************************************************
> *                                      |         __ __    \|/  *
> *   Dr. Dave Dempsey                   | )   ^  /|| ||\  --0-- *
> *   Dept. of Earth & Climate Sciences  |) ) ^  / ||_|| \  /|\  *
> *   San Francisco State University     | ) )  /  | _ |  \      *
> *   1600 Holloway Ave.                 |)   )/   || ||   \     *
> *   San Francisco, CA   94132          | )   )   ||_||    \    *
> *                                      |)  ) )   | _ |     \   *
> *   Phone:  (415) 338-7716             |  )   )  || ||      \  *
> *   FAX:    (415) 338-7705             |)   )  )~~~~~~~~~~~~~~~*
> *   Email:  address@hidden<mailto:address@hidden>           |  )  )  )  ~  ~  
>  ~ ~  *
> *                                      |)  )   ) )  ~   ~  ~   *
> ****************************************************************
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: HHW-840109
Department: Support IDV
Priority: Normal
Status: Open