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Re: [idvusers] painting map lines on 3D topography

Hi Yuan,

 

I was talking about spatial extent matching, not grid characteristics.  There 
might be YX grids out there, but not that I’ve seen.

 

The main problem is that the selected “topography” sometimes shows up on the 
right side of the dreaded MAP/TOPO screen, and sometimes it doesn’t.  Usually, 
local NC grids don’t, but I’m not sure if this is universal.  Usually online 
THREDDS grids do show up on the right, but I’m not sure if this is universal.

 

Murray

 

From: Yuan Ho [mailto:yuanho@xxxxxxxx] 
Sent: Monday, October 06, 2014 6:51 PM
To: David P Dempsey
Cc: Murray Brown; idvusers
Subject: Re: [idvusers] painting map lines on 3D topography

 

Dave,

        Yes, there is matching issue when creating the 3D map. If the grid is 
(y,x) and the map is (x,y), you will see the problem. But, the IDV does have a 
solution for you. When selecting the topography field, you should select 

Formula > Define a grid diagnostic, and then enter "GridUtil.swapLatLon(a)", 
then, enter the topography field which is

2D grid > Mass > Geopotential height @ ground, ...... after swapping, you 
should get the corrected 3D map.

 

 

Yuan 

 

On Sat, Oct 4, 2014 at 12:36 PM, David P Dempsey <dempsey@xxxxxxxx 
<mailto:dempsey@xxxxxxxx> > wrote:


On Oct 4, 2014, at 4:34 AM, Murray Brown <m.brown.nsb@xxxxxxxxx 
<mailto:m.brown.nsb@xxxxxxxxx> <mailto:m.brown.nsb@xxxxxxxxx 
<mailto:m.brown.nsb@xxxxxxxxx> >> wrote:

I got the impression during all my tests that there may be a complication due 
to the relative spatial extents of the two objects, the map and the topo.  Do 
you or the IDV folks know if there is some limitation/restriction on the 
success of this formula, due to spatial relationship?  And could spatial 
subsetting (although I did not use it) play a role?

Murray,

That’s a good question, and though I don’t know the answer, I haven’t had any 
trouble with at least some model output files whether I accepted all the region 
defaults, specified a custom region using an elastic box, or selected “Match 
Display Region”.

The exception seems to be when I try to use GFS model analyses.

I just tried loading a GFS analysis (a local file acquiring using our RAMADDA 
server: see Catalogs: http://virga.sfsu.edu:8080/repository/thredds > 
14100412_gfs2_F00.grb, for example) and plotting hi-res state boundaries. If I 
accept the region defaults for both the map data and the topography (which is 
geopotential height of ground and water surfaces) and plot hi-res state 
boundaries, then I get a 3D map for the eastern part of the US, but it’s cut 
off west of there and the topography doesn’t make sense for the eastern U.S. 
(or anyplace else that I know). Moreover, I’m unable to improve on that result 
using GFS data from another model run or by selecting custom regions or by 
selecting “Match Display Region". In fact, when I specify a custom region or 
select “Match Display Region”, I get no map plot at all and the map plot color 
table is labeled “missing gpm”.

In contrast, when I tried a 40 km NAM forecast, an 80 km NAM forecast, a RUC 
forecast, and a 10 km WRF model forecast, all using the same hi-res state map 
data, all plotted just fine, regardless of whether I accepted the default 
regions or specified “Match Display Region”.

Seems like the IDV is having a problem reading the GFS model files correctly in 
this context. (But even with the GFS data, as my screen shot yesterday showed, 
I get separate prompts for the map data and the topography, and both offer 
correct choices to choose from, which differed from what you had reported 
seeing.)

— Dave

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