[gradsusr] xy2gr bug?

Wed Jul 5 13:32:08 EDT 2017

Hi, Jennifer.

I've attached the control file. The XDEF and YDEF entries specifically are:

xdef  361 linear -6480.0 36.0

ydef  191 linear -3420.0 36.0

As an extra data point, I can replicate this in both the newest version of GrADS (2.1.1.b0) and OpenGrADS 2.1.0.oga.1. WordPad added the extra .txt extension. It’s a ctl file on the Linux side.

~Dave

-----Original Message-----
From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Jennifer M Adams
Sent: Wednesday, July 5, 2017 8:43 AM
To: GrADS Users Forum
Subject: Re: [gradsusr] xy2gr bug?

Hi, Dave —

1. What are the XDEF and YDEF entries in your descriptor file?

2. What were the commands you issued (including the dimension environment) when you drew a plot before issuing the ‘q xy2gr’ command? Did you set mprog off?

—Jennifer

> On Jun 19, 2017, at 12:35 PM, Ryglicki, Dr. David < <mailto:david.ryglicki at nrlmry.navy.mil> david.ryglicki at nrlmry.navy.mil> wrote:

> 

> Hey, GrADS list.

>  

> I’m getting an error with xy2gr – it’s duplicating the results of xy2w but only under specific circumstances. I’m using a Cartesian domain that’s not georeferenced (km from the origin as opposed to lat/lon on the planet). The two functions give similar results up to a point. To wit:

>  

> Position = 5.15564 2.55131 1 0

>  

> ga-> q xy2gr 5.15564 2.55131

> Xdim = 288.285  Ydim = -1179.48

>  

> ga-> q xy2w 5.15564 2.55131

> Lon = 3862.26  Lat = -1179.48

>  

> ga-> q xy2gr 5.15564 1.55131

> Xdim = 288.285  Ydim = -1579.48

>  

> ga-> q xy2gr 5.15564 3.55131

> Xdim = 288.285  Ydim = 74.3479

>  

> ga-> q xy2gr 5.15564 2.55131

> Xdim = 288.285  Ydim = -1179.48

>  

> ga-> q xy2gr 5.15564 2.65131

> Xdim = 288.285  Ydim = -1139.48

>  

> ga-> q xy2gr 5.15564 2.75131

> Xdim = 288.285  Ydim = -1099.48

>  

> ga-> q xy2gr 5.15564 2.85131

> Xdim = 288.285  Ydim = -1059.48

>  

> ga-> q xy2gr 5.15564 2.95131

> Xdim = 288.285  Ydim = -1019.48

>  

> ga-> q xy2gr 5.15564 3.05131

> Xdim = 288.285  Ydim = 68.7923

>  

> ga-> q xy2gr 5.15564 3      

> Xdim = 288.285  Ydim = -1000

>  

> ga-> q xy2gr 5.15564 3.01

> Xdim = 288.285  Ydim = 68.3333

>  

> ga-> q xy2w 5.15564 3.01

> Lon = 3862.26  Lat = -996

>  

> ga-> q xy2w 5.15564 3.00

> Lon = 3862.26  Lat = -1000

>  

>  

> The takeaway here is that when the position moves above -1000 “latitude,” then xy2gr is giving me the y-position grid index. Below that, then it’s the “world” coordinate. I don’t think the 3 means anything, here (just a guess).

>  

> Operator-error goof or bug?

>  

> ~Dave

> _______________________________________________

> gradsusr mailing list

>  <mailto:gradsusr at gradsusr.org> gradsusr at gradsusr.org

>  <http://gradsusr.org/mailman/listinfo/gradsusr> http://gradsusr.org/mailman/listinfo/gradsusr

--

Jennifer Miletta Adams

Center for Ocean-Land-Atmosphere Studies (COLA) George Mason University

_______________________________________________

gradsusr mailing list

 <mailto:gradsusr at gradsusr.org> gradsusr at gradsusr.org

 <http://gradsusr.org/mailman/listinfo/gradsusr> http://gradsusr.org/mailman/listinfo/gradsusr

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20170705/49ae6a47/attachment.html 
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: cotc.Patricia.grid_1-mod.ctl.txt
Url: http://gradsusr.org/pipermail/gradsusr/attachments/20170705/49ae6a47/attachment.txt 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5386 bytes
Desc: not available
Url : http://gradsusr.org/pipermail/gradsusr/attachments/20170705/49ae6a47/attachment.bin 