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<font face="Arial">Jennifer:<br>
<br>
Thanks for your help.<br>
<br>
Degrib doesn't work with these GRIB2 files
(rtgssthr_grb_0.083.grib2) correctly for some reason... I've tried
every possible combination of switches and options but I've had no
luck.<br>
<br>
I ended up using the lower resolution data file
(rtgssthr_grb_0.5.grib2) which works perfectly, and is good enough
resolution for my purposes.<br>
<br>
Thanks again for your help.<br>
<br>
Regards,<br>
<br>
Bill</font><br>
<pre class="moz-signature" cols="72">--
Bill Reilly
(+34) 686-110-748
<a class="moz-txt-link-abbreviated" href="mailto:bill@passageweather.com">bill@passageweather.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.passageweather.com">www.passageweather.com</a>
<a class="moz-txt-link-abbreviated" href="mailto:bill@brwebworks.com">bill@brwebworks.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.brwebworks.com">www.brwebworks.com</a>
</pre>
<div class="moz-cite-prefix">On 03/02/2018 14:27, Jennifer M Adams
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:A904F837-5AC0-4B9E-A579-2FF8A2F4A3F3@gmu.edu">
<pre wrap="">Hi, Bill —
The problem is that GrADS has determined that your grid does not wrap the globe. The error is in your XDEF declaration. You have
XDEF 4321 LINEAR -179.958333 0.083333
which you say you got from degrib. That is incorrect. The size should be 4320 — the grid as you’ve defined it actually overlaps and therefore fails the globe-wrapping test in GrADS (if longitude at x=1 is roughly the same as longitude at x=xsize+1)
Since your descriptor file is for a flat binary file and not a grib2 file, I suspect you may have stuck an extra column of data onto your grid when converting the format.
I downloaded the grib2 file in question and used g2ctl to get a descriptor and got this for XDEF:
XDEF 4320 linear 0.042000 0.083000
Your grid size is clearly 4320 and not 4321. A quick check of the initial lon value confirms that the grib2 grid goes from 0 to 360 and not -180 to 180.
Here is my complete descriptor:
dset ^rtgssthr_grb_0.083.grib2
index ^rtgssthr_grb_0.083.idx
undef 9.999E+20
title rtgssthr_grb_0.083.grib2
dtype grib2
ydef 2160 linear -89.958000 0.083
xdef 4320 linear 0.042000 0.083000
tdef 1 linear 00Z01feb2018 1mo
zdef 1 linear 1 1
vars 1
sst 0,1,0 0,0,0 sea surface temperature [K]
endvars
—Jennifer
</pre>
<blockquote type="cite">
<pre wrap="">On Feb 2, 2018, at 10:04 PM, Bill Reilly <a class="moz-txt-link-rfc2396E" href="mailto:Bill_Reilly@compuserve.com"><Bill_Reilly@compuserve.com></a> wrote:
James:
Thanks for your reply.
Attached is the control file (created by Degrib) from the GRIB file: <a class="moz-txt-link-freetext" href="ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/sst.20180201/rtgssthr_grb_0.083.grib2">ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/sst.20180201/rtgssthr_grb_0.083.grib2</a>
The output fom 'q dims' is:
X is varying Lon = -179.958 to 180.04 X = 1.00002 to 4321
Y is varying Lat = -89.958 to 89.9579 Y = 1.00007 to 2160
Z is fixed Lev = 0 Z = 1
T is fixed Time = 00Z01FEB2018 T = 1
Another problem is the white gap along the Greenwich Meridian, as you can see here: <a class="moz-txt-link-freetext" href="http://secure-web.cisco.com/1klShagusmxOl2ljtIq0xB1a58WL6eghciuLuMXRTbBkiU9zFianbONsiCD5I-y2PTKHSVmaYcvybUmgpuQ59vFAYD5cX5Oxb3ao_497WlYyjx1oIzEJd58GzNzum087LvDurkbC8wREnRMwoZPJOsbuNs98MfWYk5HOBXn5Dp-wWWuoUOvLlpXxwlQA3U86Yy8ZuczaB5cnQiDLQsstlml29f5aLrTupsYDAHHD_esZgOFgTD3NB-90jKdwg22ym-0e489MflL9bY1A6WtWEvDgQ-0ge1FkXV4dl0BULXWkEl6weDf4rGSr1oPyteCpC2uTvPUCUDc83mQkQ-xiitNejC3xjSLHJxTFOAE6NoRAuO5KHmuTiNaHv4rrKX3zyNjuKCS-2jyEOlofPn6zDclN0tiY9wtwGzc8Or_JhZNNk4VLlhcl76vx5QVgdt0Am/http%3A%2F%2Fwww.passageweather.com%2Fmaps%2Fneurope%2Fsstc.png">http://secure-web.cisco.com/1klShagusmxOl2ljtIq0xB1a58WL6eghciuLuMXRTbBkiU9zFianbONsiCD5I-y2PTKHSVmaYcvybUmgpuQ59vFAYD5cX5Oxb3ao_497WlYyjx1oIzEJd58GzNzum087LvDurkbC8wREnRMwoZPJOsbuNs98MfWYk5HOBXn5Dp-wWWuoUOvLlpXxwlQA3U86Yy8ZuczaB5cnQiDLQsstlml29f5aLrTupsYDAHHD_esZgOFgTD3NB-90jKdwg22ym-0e489MflL9bY1A6WtWEvDgQ-0ge1FkXV4dl0BULXWkEl6weDf4rGSr1oPyteCpC2uTvPUCUDc83mQkQ-xiitNejC3xjSLHJxTFOAE6NoRAuO5KHmuTiNaHv4rrKX3zyNjuKCS-2jyEOlofPn6zDclN0tiY9wtwGzc8Or_JhZNNk4VLlhcl76vx5QVgdt0Am/http%3A%2F%2Fwww.passageweather.com%2Fmaps%2Fneurope%2Fsstc.png</a>, but that's a different problem which I'll get to afterwards.
Thanks for your help.
Bill
--
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On 03/02/2018 03:23, James T. Potemra wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Bill,
Can you provide the control file? Or the URL? If you enter "q dims" it should show the legitimate lat/lon ranges available. If these show a global range you should be able to plot it.
Jim
On 2/2/18 2:38 PM, Bill Reilly wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello:
I'm trying to display the NCEP global SST data using GrADS but I can't get it to display data across the 180° meridian... It will either display west of this meridian or east of it, but not both.
Using the North Pacific Ocean as an example, I want the plot to go from 110°E to 80°W.
'set lon 110 280' only displays data WEST of 180°.
'set lon -250 -80' only displays EAST of 180°.
'set lon 110 -80' doesn't display anything.
'set lon 470 640' doesn't display anything.
Does anybody have any ideas how to fix this?
Thanks,
Bill
--
Bill Reilly
(+34) 686-110-748
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<pre wrap="">
--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University
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