RHI wrong direction about pyart HOT 5 CLOSED

Hey Joe,
The way we coded this up was to use the sign of the X component of R. So that if the RHI was to the west it is negative and +ive if to the east.. Perhaps we need an override for this..

One of the reasons is for HS-RHIs (0-90-0 over the top) which have a +ive and -ve part.

On Dec 12, 2013, at 1:16 PM, Joseph Hardin [email protected] wrote:

I'm not sure if this is something weird with my data, but when plotting RHI's I get a plot that is backward from what people normally use for rhi's. The normal convention is the radar is at 0, distance goes out to positive numbers towards the right. I don't remember seeing this issue before so it may just be the data.
If this is indeed the format pyart uses, would it be possible to get an optional argument to switch to the normal layout. I'm attaching a plot. I checked and teh elevations are correct(0, to 40'ish). Code to reproduce:

import pyart
radar =pyart.io.read_sigmet(filename)
radar.elevation['data'][radar.elevation['data']>80]=0 #Fix some Iris weirdness
display = pyart.graph.RadarDisplay(radar)
display.plot_rhi('reflectivity',3,vmin=0,vmax=60)

You can find the data file at https://www.dropbox.com/s/t0nw10izn2br9en/np1130504050139.RAW7WPK

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We could pretty easily add a check to see if all the distances in a RHI plot are negative and flip the sign when this happens (all user-controllable by a few additional arguments). That would plot 0-90 RHI as all positive and 0-180 (over to top) RHI as the are now. Does this seem reasonable?

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That would be great.
Joseph C. Hardin

On 12/16/2013 01:11 PM, Jonathan J. Helmus wrote:

We could pretty easily add a check to see if all the distances in a
RHI plot are negative and flip the sign when this happens (all
user-controllable by a few additional arguments). That would plot 0-90
RHI as all positive and 0-180 (over to top) RHI as the are now. Does
this seem reasonable?

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#111 (comment).

Joseph C. Hardin, MSEE
Research Assistant
Electrical and Computer Engineering
Colorado State University
AGEP Fellow
Ph.D. Intern Sandia National Laboratory
Phone (970)-491-1437

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I personally would want an option to override that though..

I like to align my RHIs west-east as that is the way I see storms in my head :)

But yes, sounds reasonable and a lot more “Main stream”

On Dec 16, 2013, at 2:11 PM, Jonathan J. Helmus [email protected] wrote:

We could pretty easily add a check to see if all the distances in a RHI plot are negative and flip the sign when this happens (all user-controllable by a few additional arguments). That would plot 0-90 RHI as all positive and 0-180 (over to top) RHI as the are now. Does this seem reasonable?

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Added a reverse_xaxis parameter to the plot_rhi method in commit 5e9bee1 . Set to False to get the old behavior on 0 to 90 RHIs.

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