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<p style="margin-bottom:0in">Dear GrADs Users,
</p>
<p style="margin-bottom:0in"><br>
</p>
<p style="margin-bottom:0in">I am trying to extract MODIS aerosol
product (AOD at 0.550 microns). These file has <span style="background:none repeat scroll 0% 0% rgb(255,255,0)">no
discernable time coordinate -- using default values.</span>
If I
display the contents of the file, I get something. I also can get a
value for specific grids. I have written a descriptor file to define
my time dimension and also combine the different files. This, I have
<font color="#008080"><span style="background:none repeat scroll 0% 0% transparent">successfully
done. </span></font>However, if I try to display the contents, <font color="#800000">I
get the error. Again if I try to write the contents of the file to a
text file, all the values printed are missing. </font>
</p>
<p style="margin-bottom:0in"><br>
</p>
<p style="margin-bottom:0in"><font color="#800000">Kindly advise</font></p>
<p style="margin-bottom:0in"><br>
</p>
<p style="margin-bottom:0in">=============================================================================================
</p>
<p style="margin-bottom:0in">ga-> sdfopen
<a href="http://MOD08_M3.A2000061.051.2010273213159.pscs_000500501908.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc">MOD08_M3.A2000061.051.2010273213159.pscs_000500501908.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc</a>
</p>
<p style="margin-bottom:0in">Scanning self-describing file:
<a href="http://MOD08_M3.A2000061.051.2010273213159.pscs_000500501908.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc">MOD08_M3.A2000061.051.2010273213159.pscs_000500501908.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc</a>
</p>
<p style="margin-bottom:0in">SDF file <span style="background:none repeat scroll 0% 0% rgb(255,255,0)">has
no discernable time coordinate -- using default values</span>.
</p>
<p style="margin-bottom:0in">SDF file
<a href="http://MOD08_M3.A2000061.051.2010273213159.pscs_000500501908.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc">MOD08_M3.A2000061.051.2010273213159.pscs_000500501908.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc</a>
is open as file 1
</p>
<p style="margin-bottom:0in">LON set to 0 360
</p>
<p style="margin-bottom:0in">LAT set to -89.5 89.5
</p>
<p style="margin-bottom:0in">LEV set to 0 0
</p>
<p style="margin-bottom:0in">Time values set: 1:1:1:0 1:1:1:0
</p>
<p style="margin-bottom:0in">E set to 1 1
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">ga-> d optical_depth_l
</p>
<p style="margin-bottom:0in">Contouring: -0 to 5 interval 0.5
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in"><font color="#008080">ga-> open
jos-all.ctl
</font></p>
<p style="margin-bottom:0in"><font color="#008080">Scanning
description file: jos-all.ctl
</font></p>
<p style="margin-bottom:0in"><font color="#008080">Data file
MOD08_M3.A20%y2%<a href="http://mc.051.2010280204610.pscs_000500502115.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc">mc.051.2010280204610.pscs_000500502115.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc</a>
is open as file 1
</font></p>
<p style="margin-bottom:0in"><font color="#008080">LON set to 0 360
</font></p>
<p style="margin-bottom:0in"><font color="#008080">LAT set to -89.5
89.5
</font></p>
<p style="margin-bottom:0in"><font color="#008080">LEV set to 0 0
</font></p>
<p style="margin-bottom:0in"><font color="#008080">Time values set:
2000:3:1:0 2000:3:1:0
</font></p>
<p style="margin-bottom:0in"><font color="#008080">E set to 1 1</font>
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">I checked the current dimension by
</p>
<p style="margin-bottom:0in">ga-> q dims
</p>
<p style="margin-bottom:0in">Default file number is: 1
</p>
<p style="margin-bottom:0in">X is varying Lon = 0 to 360 X =
180.5 to 540.5
</p>
<p style="margin-bottom:0in">Y is varying Lat = -89.5 to 89.5 Y
= 1 to 180
</p>
<p style="margin-bottom:0in">Z is fixed Lev = 0 Z = 1
</p>
<p style="margin-bottom:0in">T is fixed Time = 00Z01MAR2000 T =
1
</p>
<p style="margin-bottom:0in">E is fixed Ens = 1 E = 1
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">these are the content of my descriptor
file
</p>
<p style="margin-bottom:0in">ga-> q ctlinfo
</p>
<p style="margin-bottom:0in">dset
MOD08_M3.A20%y2%<a href="http://mc.051.2010280204610.pscs_000500502115.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc">mc.051.2010280204610.pscs_000500502115.Optical_Depth_Land_And_Ocean_Mean_Mean.G3.nc</a>
</p>
<p style="margin-bottom:0in">title "MODIS Aerosol Optical
Thickness"
</p>
<p style="margin-bottom:0in">undef -9999
</p>
<p style="margin-bottom:0in">dtype netcdf
</p>
<p style="margin-bottom:0in">xdef 360 linear -179.5 1
</p>
<p style="margin-bottom:0in">ydef 180 linear -89.5 1
</p>
<p style="margin-bottom:0in">zdef 1 linear 0 1
</p>
<p style="margin-bottom:0in">tdef 159 linear 00Z01MAR2000 1mo
</p>
<p style="margin-bottom:0in">vars 1
</p>
<p style="margin-bottom:0in">optical_depth_l 0 y,x Aerosol
Optical Thickness at 0.55 microns for both Ocean (best) and Land
(corrected): Mean of Daily Mean
</p>
<p style="margin-bottom:0in">endvars
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">I set t =1 and try to display and I get
an error
</p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">ga-> set t 1
</p>
<p style="margin-bottom:0in">Time values set: 2000:3:1:0 2000:3:1:0
</p>
<p style="margin-bottom:0in"><font color="#800000">ga-> d
optical_depth_l
</font></p>
<p style="margin-bottom:0in"><font color="#800000">Cannot contour
grid - all undefined values
</font></p>
<p style="margin-bottom:0in">
</p>
<p style="margin-bottom:0in">
ga-> q dims
</p>
<p style="margin-bottom:0in">Default file number is: 1
</p>
<p style="margin-bottom:0in">X is fixed Lon = 30.5 X = 211
</p>
<p style="margin-bottom:0in">Y is fixed Lat = 1.5 Y = 92
</p>
<p style="margin-bottom:0in">Z is fixed Lev = 0 Z = 1
</p>
<p style="margin-bottom:0in">T is varying Time = 00Z01JAN0001 to
02:38Z01JAN0001 T = 1 to 159
</p>
<p style="margin-bottom:0in">E is fixed Ens = 1 E = 1
</p>
<p style="margin-bottom:0in"><br>
</p>
<p style="margin-bottom:0in"><font color="#00ff00">ga-> fprintf
optical_depth_l modis.txt
</font></p>
<p style="margin-bottom:0in"><font color="#00ff00">wrote 159 values
to file "modis.txt"
</font></p>
<p style="margin-bottom:0in"><font color="#00ff00">159 -9.99e+08
ga-></font></p><br><p style="margin-bottom:0in">=======================================================================</p><p style="margin-bottom:0in"><br></p><p style="margin-bottom:0in"></p><p style="margin-bottom:0in">
Regards</p><p style="margin-bottom:0in"></p><p style="margin-bottom:0in">Joshua<br></p>
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