[gradsusr] Problem to plot a figure in GrAds from gaussian latitude grid

[Jose Augusto Paixão Veiga]

Dear all,

I am facing the following problem in GrAds:

After producing my CTL file and plotted the results I get surprised with plot result (Figure in attach).   Note that the fifth point from the last latitude is shifted for the equatorial latitude. So, I decided to use the command q ctlinfo to get some information about the latitudes ingested by GrAds after I've been opened the CTL file. Them, I realize that GrAds "make" some confusing with one specific latitude point.   Pay attention,

This is a part of the result from the command q ctlinfo :

xdef 1 linear 1 1
ydef 64 levels -87.8638 -85.0965 -82.3129 -79.5256 -76.7369 -73.9475 -71.1577 -68.3678
 -65.5776 -62.7873 -59.997 -57.2066 -54.4162 -51.6257 -48.8352 -46.0447 -43.2542 -40.4636
 -37.6731 -34.8825 -32.0919 -29.3014 -26.5108 -23.7202 -20.9296 -18.139 -15.3484 -12.5578
 -9.76715 -6.97653 -4.18592 -1.39531 1.39531 4.18592 6.97653 9.76715 12.5578 15.3484
 18.139 20.9296 23.7202 26.5108 29.3014 32.0919 34.8825 37.6731 40.4636 43.2542
 46.0447 48.8352 51.6257 54.4162 57.2066 59.997 62.7873 65.5776 68.3678 71.1577
 73 0.9475 76.7369 79.5256 82.3129 85.0965
zdef 1 linear 1 1

Thus, GrAds separates one latitude value into two others. I told this because the latitude point 73.9475 is duplicated into the points 73 and 0.9475. When I change the value for the integer 73 everything goes well and the value is not shifted for the "center of figure". However I wouldn't like to to this all the time I face this.

I would appreciate any hint and help.  I don't know what is producing this split in the latitude value.


This is part of my ctl file 

title CNRM  model output prepared for IPCC Fourth Assessment climate of the 20th Century experiment (20C3M)
xdef 1 linear 1 1
ydef   64 levels -87.8638 -85.0965 -82.3129 -79.5256 -76.7369 -73.9475 -71.1577 -68.3678 -65.5776 -62.7873 -59.997 -57.2066 -54.4162 -51.6257 -48.8352 -46.0447 -43.2542 -40.4636 -37.6731 -34.8825 -32.0919 -29.3014 -26.5108 -23.7202 -20.9296 -18.139 -15.3484 -12.5578 -9.76715 -6.97653 -4.18592 -1.39531 1.39531 4.18592 6.97653 9.76715 12.5578 15.3484 18.139 20.9296 23.7202 26.5108 29.3014 32.0919 34.8825 37.6731 40.4636 43.2542 46.0447 48.8352 51.6257 54.4162 57.2066 59.997 62.7873 65.5776 68.3678 71.1577 73.9475  76.7369 79.5256 82.3129 85.0965 87.8638 
zdef 1 linear 1 1
tdef 252 linear JAN1979 1MO
vars  17
gz 0 33,100 generation of available potential energy


Cheers,


José Augusto P. Veiga, 

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Universidade do Estado do Amazonas 
Departamento de Meteorologia
Escola Superior de Tecnologia (EST)
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