[gradsusr] mysterious bug with merra-2 data

Thu Mar 22 04:53:54 EDT 2018

set lon -180 180

Alan
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On 3/22/18 8:08 AM, TAO Fl wrote:
> Hello, all,
>
> How to change the backgroud continent boundary when mapping. The 
> default one from logitude 0 to 180 to 0, splitting the Africa, how to 
> change it from -180 to 0 to +180?
>
> Thanks a lot.
>
> FL
>
>
> On ‎Thursday‎, ‎March‎ ‎08‎, ‎2018‎ ‎06‎:‎40‎:‎36‎ ‎PM, Jennifer M 
> Adams <jadams21 at gmu.edu> wrote:
>
>
> Well, in one example, you are reading data from the edge of the time 
> series (t=1) and in the other you are reading from the middle. Are you 
> doing some interpolation to get your data values? You should look at 
> the output from ‘set lat 49’ ‘set lon 4.375’, ‘set t 1’, and ‘set t 
> 8017’ and check the ‘q dims’ output to see if you’re really reading 
> the grid elements you are expecting.
> —Jenniferg
>
>
> > On Mar 8, 2018, at 11:29 AM, Antoine Molin <amolin at plenr.fr 
> <mailto:amolin at plenr.fr>> wrote:
> >
> > Hi,
> >
> > Thanks, but it doesn't change the bug.
> > Antoine
> >
> > -----Message d'origine-----
> > De : gradsusr [mailto:gradsusr-bounces at gradsusr.org 
> <mailto:gradsusr-bounces at gradsusr.org>] De la part de Jennifer M Adams
> > Envoyé : mardi 6 mars 2018 12:53
> > À : GrADS Users Forum
> > Objet : Re: [gradsusr] mysterious bug with merra-2 data
> >
> > Try setting your tdef to be at 00z instead of 00:30z.
> > —Jennifer
> >
> >> On Mar 2, 2018, at 9:11 AM, Antoine Molin <amolin at plenr.fr 
> <mailto:amolin at plenr.fr>> wrote:
> >>
> >> Hi,
> >>
> >> I am using merra-2 data U&V wind speeds at 50m, for wind energy 
> studies in France ; very good data…..
> >>
> >> Getting « MERRA2_400.tavg1_2d_slv_Nx.%y4%m2%d2.SUB.nc4»  daily 
> files, data are obtained with grads, using xdfopen and enclosed data 
> descriptor files.
> >>
> >> I really don’t understand why i get different values with different 
> descriptor files, for same point and time :
> >>
> >> As an example, at point (49°N ; 4.375°E) and time  2017-12-01 at 
> 0h,  i get U50m=5.31 m/s using « merra2_dec2017.ctl »  (lat = 49, lon 
> = 4.375, t = 1), and U50m=5.22 m/s using « merra2_2017.ctl »  (lat = 
> 49, lon = 4.375, t=8017)…..
> >>
> >> Why ????????????????
> >>
> >> Thanks !
> >>
> >>
> >> Antoine Molin
> >> Etudes de vent PlenR
> >> Tel : 03 20 47 99 76
> >>
> >> <Merra2_dec2017.ctl><Merra2_2017.ctl>_________________________________
> >> ______________
> >> gradsusr mailing list
> >> gradsusr at gradsusr.org <mailto:gradsusr at gradsusr.org>
> >> http://secure-web.cisco.com/1YHn2kxBdY0siqbfboOZr0jcjcl2zr9o6Gxi6_h3TI
> >> p-dlIU19SX8xcDNJv-O9PbArHRj1byC4sIdPixjq70UWBqQjRPhAXTOaizuwZI_p2vF573
> >> cOSxYPbtNlhBdOpGUxpyF9h_UyTaGUKU9Sok1jNXllnCxKFt_m2KuHSqT39z_8qpxx3lvf
> >> s4Ev3-LGwtUwBv6yDJJwk0qii05GMQfad2ZbYJ9RRtVYPajumMOamr-mbg9c56h_LuwQha
> >> ruK4XGF13TNaWuvsxy37SZhTyNcDP_ndBhlpvhOndNHzYx3QGocG-yN-YXEjEVXGH3Ro9M
> >> VMYwONyIHw6sb5zZX71AGpWJDW5cq7PmJXgzv-s9S5P5Tc_B1wJ3YNMkuViOHPhqy8G3bS
> >> jZqBV6B2Qgo53jCwCbB3nHLMyZxDQV9FYRg-AYAqngh-RL5tVkJZuUZnA/http%3A%2F%2
> >> Fgradsusr.org%2Fmailman%2Flistinfo%2Fgradsusr
> >
> > --
> > Jennifer Miletta Adams
> > Center for Ocean-Land-Atmosphere Studies (COLA) George Mason University
> >
> >
> >
> >
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> > gradsusr at gradsusr.org <mailto:gradsusr at gradsusr.org>
> > 
> http://secure-web.cisco.com/1lEbzJ6Y7BtyTDPTaeLX4AECy6dZrPJMkxO-UvfhH1JOO1QViJFC7gWcLgxs6foTmL1qlsxtvCm22RLYQ5IonmetepRQ0LsIISaFyPYRC4JbFHbvyqGlyvhZJ1yz-ytcuFtd54lUyxA9Co8eDHleBm1gNT6kR5IMzWOJPqSRetviTuj7NaaQ_w2ttqSKB9CO7sU_bSg93h_urxnY5ZjQXucoimQ-EsKNyTBqDXjfKfLMST4eLQFOUhmc4e50_xhGF0bngfchTb-Wp57edBVJBN15GkYJm7rpFHH3smKwuR93sEyfIUkN5hQNJGkWddnu5aQajeRjCkIAoo0gXuLxkms-qgHXMyCJwf-IuyHwRbJ9ClsX2yc4aF6VRtrGVd33sJEK_Lnot13pX5nkyyWOppF2aXub20S51yiA-579H-s-Sk8INUZBW612YBcFrreJd/http%3A%2F%2Fgradsusr.org%2Fmailman%2Flistinfo%2Fgradsusr
> >
> >
>
> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
>
>
>
>
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