Jennifer,<div>Interesting. I tried UNPACK without third argument and got the following error, for example:</div><div><br></div><div><div>ga-> d tmp-273.15</div><div>Warning: Could not retrieve add offset -- setting to 0.0</div>
<div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div>
<div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div><div>Warning: Could not retrieve add offset -- setting to 0.0</div><div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div>
<div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div><div>Contouring: -560 to -480 interval 10</div><div><br></div><div>However, with offset value of 512.81 included, it works correctly:</div>
<div><br></div><div><div>ga-> d tmp-273.15</div><div>Contouring: -50 to 30 interval 10</div><div>Contouring: -40 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div>
<div>Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div><div>
Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div><div>Contouring: -50 to 30 interval 10</div></div><div><br></div><div>Stephen Mc</div><br><div class="gmail_quote">On Tue, Aug 30, 2011 at 6:31 PM, Jennifer Adams <span dir="ltr"><<a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div style="word-wrap:break-word">Glad to hear it is working. Just for the record, the third argument to the UNPACK entry is not necessary, the two attribute names are all you need. --Jennifer<div>
<div></div><div class="h5"><div><br><div><div><div>On Aug 30, 2011, at 5:52 PM, Stephen McMillan wrote:</div><br><blockquote type="cite">Hi Jennifer,<div><br><div>I did a "q attr" check on the 1948 file and found this:</div>
<div><div>air Float32 add_offset 512.81</div><div>air Float32 scale_factor 0.01</div><div><br></div><div>Trying to follow example in the GrADS documentation and a few trial-and-error runs, here's my revised descriptor:</div>
<div><div><br></div><div><div><div>DSET h:\cdf\dailymeans\air.sig995.%<a href="http://y4.nc" target="_blank">y4.nc</a></div><div>TITLE Daily Air Temperature Sig995 01Jan1948-current</div><div>DTYPE netcdf</div><div>OPTIONS template yrev</div>
<div>UNDEF -9.99e+33</div><div>UNPACK scale_factor add_offset 512.81</div><div>XDEF 144 linear 0 2.5</div><div>YDEF 73 linear -90 2.5</div><div>ZDEF 1 linear 0 1</div><div>TDEF 3653 linear 01jan1948 1dy</div><div>VARS 1</div>
<div>air=>tmp 0 t,y,x Mean Daily Air Temperature at sigma level 995 (degK)</div><div>ENDVARS</div></div></div></div><div><br></div><div>Initially, after re-running, the numbers looked "okay" (a reasonable range) but I noticed they were upside-down mirror images of what I got using yearly files separately. So I added the "yrev" OPTIONS keyword and that appears to have fixed it. </div>
<div><br></div><div>I believe everything works correctly now, so thanks for pointing me in the right direction!</div><div><br></div><div>Stephen McMillan</div><div><div><div><br></div></div></div><br><div class="gmail_quote">
On Tue, Aug 30, 2011 at 4:40 PM, Jennifer Adams <span dir="ltr"><<a href="mailto:jma@cola.iges.org" target="_blank">jma@cola.iges.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Looks like you need the UNPACK entry in your descriptor file. Check your netcdf files for scale_factor and add_offset attributes.<div>--Jennifer</div><div><br><div><div><div></div><div> <div>
On Aug 30, 2011, at 4:31 PM, Stephen McMillan wrote:</div><br></div></div><blockquote type="cite"><div><div></div><div>I am having a problem correctly displaying multiple file data using a template control file. My objective is to open, for example, the set of daily air temperature data files (in yearly files) from 1948 to current as a single file, then display/analyze the data as needed without having to open each file separately. Contents of control file (air.sig995.daily.1948-.ctl):<div>
<br></div><div><div>DSET h:\cdf\dailymeans\air.sig995.%<a href="http://y4.nc" target="_blank">y4.nc</a></div><div>TITLE Daily Air Temperature Sig995 01Jan1948-current</div><div>DTYPE netcdf</div><div>OPTIONS template</div>
<div>UNDEF -9.99e+33</div> <div>XDEF 144 linear 0 2.5</div><div>YDEF 73 linear -90 2.5</div><div>ZDEF 1 linear 0 1</div><div>TDEF 3653 linear 01jan1948 1dy</div><div>VARS 1</div><div>air=>tmp 0 t,y,x Mean Daily Air Temperature at sigma level 995 (degK)</div>
<div>ENDVARS</div></div><div><br></div><div>For test purposes, I set TDEF to cover only the first 10 years. When I launch it in GrADS, it opens "normally" but the data displays with values much lower than expected. Following is the GrADS session transcript:</div>
<div><br></div><div>Grid Analysis and Display System (GrADS) Version 2.0.a7.oga.3</div><div>Copyright (c) 1988-2008 by Brian Doty and the</div><div>Institute for Global Environment and Society (IGES)</div><div>GrADS comes with ABSOLUTELY NO WARRANTY</div>
<div>See file COPYRIGHT for more information</div><div><br></div><div>Config: v2.0.a7.oga.3 little-endian readline printim grib2 netcdf hdf4-sds hdf5</div><div>opendap-grids,stn athena geotiff</div><div>Issue 'q config' command for more information.</div>
<div>Loading User Defined Extensions table </bin/gex/udxt> ... ok.</div><div>GX Package Initialization: Size = 11 8.5</div><div>ga-> open c:\cdf\dailymeans\air.sig995.daily.1948-.ctl</div><div>Scanning description file: c:\cdf\dailymeans\air.sig995.daily.1948-.ctl</div>
<div>Data file h:\cdf\dailymeans\air.sig995.%<a href="http://y4.nc" target="_blank">y4.nc</a> is open as file 1</div><div>LON set to 0 360</div><div>LAT set to -90 90</div><div>LEV set to 0 0</div><div>Time values set: 1948:1:1:0 1948:1:1:0</div>
<div>E set to 1 1</div><div>ga-> q ctlinfo</div><div>dset h:\cdf\dailymeans\air.sig995.%<a href="http://y4.nc" target="_blank">y4.nc</a></div><div>title Daily Air Temperature Sig995 01Jan1948-current</div><div>undef -9.99e+33</div>
<div> dtype netcdf</div><div>xdef 144 linear 0 2.5</div><div>ydef 73 linear -90 2.5</div><div>zdef 1 linear 0 1</div><div>tdef 3653 linear 00Z01JAN1948 1440mn</div><div>vars 1</div><div>air=>tmp 0 t,y,x Mean Daily Air Temperature at sigma level 995 (degK)</div>
<div>endvars</div><div>ga-> set time 25dec1953 5jan1954</div><div>Time values set: 1953:12:25:0 1954:1:5:0</div><div>ga-> d tmp-273.15</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div>
<div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div>
<div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div><div>Contouring: -29000 to -21000 interval 1000</div>
<div>ga-></div><div>______________________________________</div><div><br></div><div>I was expecting data to display in deg C, i.e., in the range of roughly -50 to 30, which is what I would get if I open a yearly file separately. I also noticed that the display pattern itself is not consistent with the original files' data. The data folder contains valid yearly files from 1948 through 2011.</div>
<div><br></div><div>I did search the <a href="http://gradsusr.org" target="_blank">gradsusr.org</a> archives for help, but could not find a solution. I would appreciate someone suggesting a fix. I am using Opengrads Version 2.0.a7.oga.3 on a Windows XP.</div>
<div><br></div><div>Stephen McMillan</div><div><br></div> </div></div><pre>***************************************************
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--</div><div>Jennifer M. Adams</div><div>IGES/COLA</div><div>4041 Powder Mill Road, Suite 302</div><div>Calverton, MD 20705</div><div><a href="mailto:jma@cola.iges.org" target="_blank">jma@cola.iges.org</a></div><div><br>
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