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

[Support #PSU-394434]: LEAD Workflow Viewing Problem

Hi Stefan-

Please send these questions to address@hidden.  That way, you
will get an answer if I am out of town.  

>I am running and testing work flows for the LEAD project at Millersville 
>University. I have come across an interesting error when trying to view any 
>vorticity type in IDV.  Attached is the image. The first thing I have a 
>question on is the map projection. It seems like IDV is not auto-correcting to 
>get the correct map projection to match the data. Is it suppose to auto 
>correct to the correct map projection for the data? 

For the raw WRF netCDF output, when we calculate derived quantities, the 
projection
information gets lost.

>Second, when you look at the image, notice the streaks of no color 
>shading(black streaks). At first I thought this was missing data from the 
>model run, but it has consistently been showing up run after run in any 
>vorticity field I try to color shade. So, I don't think its a data outage 
>problem. Dr. Yalda and I were wondering if you had an idea on either of the 
>problems. I will also test other parameters to see if I get the 
>"streaking" pattern.

This is a function of the resampling of the grid to create the slices.  
Unfortunately, 
with these staggered  grids, the sampling doesn't always get the correct points.

In general, we recommend that WRF netCDF data be post-processed before being 
used
in the IDV.   That removes the staggering, creates the standard meteorological
variables that are generally used and avoids the large memory overhead and 
sampling
issues you see with the staggered netCDF grids.  LEAD was supposed to include
WRFPost as a service, but I'm not sure what ever happened to that.

Don Murray

Ticket Details
===================
Ticket ID: PSU-394434
Department: Support IDV
Priority: Normal
Status: Open