<div dir="ltr"><div>Hi,<br><br></div>I have attached the code I used to calculate difference between two models at a single time step. Model 1 (grib2 file) dimension is [lat | 181] x [lon | 360] and
coordinates are lat_0: [90..-90], lon_0: [ 0..359]. _FillValue :
1e+20<div> </div><div>second one (netcdf) dimension [lat | 180] x
[lon | 360] and coordinates are lat: [-89.5..89.5] , lon:
[-179.5..179.5]. _FillValue : -9999<br><br></div><div> I regrid the 2nd to the first one co-ordinate and make a difference plot over different regions. <br><br></div><div>Q1. If the 1st model latitude is [90..-90] and regrided 2nd model latitude coordinates are latitude is [-90..90], does it have any impact on the difference plot ? <br><br></div><div>I have attached the code, model 1 output. I ftp the second model output (icap_2015091500_MME_modeaod550.nc) as that is of larger size.<br><br></div><div>Thanks.<br></div><div>Debasish<br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 12, 2016 at 1:57 PM, Mary Haley <span dir="ltr"><<a href="mailto:haley@ucar.edu" target="_blank">haley@ucar.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-size:small">Debasish,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Without seeing your code, we have no way of helping you debug it.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">I recommend using print statements to verify that your data after interpolation is correct. If your interpolated data array is called (data_interp):</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default">printVarSummary(data_interp)</div><div class="gmail_default" style="font-size:small">printMinMax(data_interp,0)<br>print(num(ismissing(data_interp))) ; count the number of missing values<br><br>If you continue to have problems, it would help if we could see a plot or some code.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">--Mary</div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Apr 11, 2016 at 6:57 AM, Debasish Hazra <span dir="ltr"><<a href="mailto:debasish.hazra5@gmail.com" target="_blank">debasish.hazra5@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Hi,<div><br></div><div> I am using NCL (v6.3) to make a difference plot between two model outputs. First one (grib2 file) dimension is [lat | 181] x [lon | 360] and coordinates are lat_0: [90..-90], lon_0: [ 0..359]. _FillValue : 1e+20</div><div> </div><div>second one (netcdf) dimension [lat | 180] x [lon | 360] and coordinates are lat: [-89.5..89.5] , lon: [-179.5..179.5]. _FillValue : -9999</div><div><br></div><div>To make both of them equal dimension before doing differences, I used "<font color="#000000"><span style="white-space:pre-wrap">linint2" function to interpolate 2nd one to the dimension of first. However, after doing simple difference plot between the interpolated one and the first output, I am getting all constant value and map plot remains empty. Individual plot of these 2 dataset show lot of differences. Is it because I did not assign fillvalue after interpolation , or something else ? Any suggestions.</span></font></div><div><font color="#000000"><span style="white-space:pre-wrap"><br></span></font></div><div><font color="#000000"><span style="white-space:pre-wrap">Thanks</span></font><span><font color="#888888"><br></font></span></div><span><font color="#888888"><div><font color="#000000"><span style="white-space:pre-wrap">Debasish</span></font></div></font></span></div>
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