Great! thank you. IŽll let you know about my progress.<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><br>Bests,<br>
<br>Sandro<br><br><div class="gmail_quote">2011/7/14 James E. Johnson <span dir="ltr">&lt;<a href="mailto:James.Johnson@nasa.gov" target="_blank">James.Johnson@nasa.gov</a>&gt;</span><div><div></div><div class="h5"><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">First, make sure you have a version of GrADS that supports reading HDF-EOS5 grid files (2.0.a7 or higher).<br>


Below is a sample GrADS control (.ctl) file that will let you read an OMI SO2 level-3 gridded HDF-EOS5 data file:<br>
<br>
DSET  OMI-Aura_L3-OMSO2e_2004m1001_v003-2011m0526t144250.he5<br>
DTYPE hdf5_grid<br>
TITLE OMI Level-3 Daily Lat/Lon 0.25deg Gridded Column Sulfur Dioxide Version 003 (OMSO2e.003)<br>
UNDEF -1.26765060e+30 _FillValue<br>
XDEF  1440 linear -180.0 0.25<br>
YDEF   720 linear  -90.0 0.25<br>
ZDEF     1 levels 1<br>
TDEF     1 linear 01oct2004 1dy<br>
VARS    14<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/ColumnAmountSO2_PBL=&gt;so2pbl     0  y,x  Vertical Column Amount SO2<br>
(Planetary Boundary Layer)<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/SlantColumnAmountSO2=&gt;slantso2  0  y,x  Slant Column Amount SO2<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/Latitude=&gt;lat                   0  y,x  Geodetic Latitude<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/Longitude=&gt;lon                  0  y,x  Geodetic Longitude<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/Time=&gt;tai93                     0  y,x  Time (seconds since January 1, 1993)<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/OrbitNumber=&gt;orbit              0  y,x  Orbit Number<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/LineNumber=&gt;line                0  y,x  Line Number<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/SceneNumber=&gt;scene              0  y,x  Scene Number<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/ColumnAmountO3=&gt;to3             0  y,x  Total Column Amount O3<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/RadiativeCloudFraction=&gt;rcf     0  y,x  Radiative Cloud Fraction<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/TerrainHeight=&gt;theight          0  y,x  Terrain Height<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/SolarZenithAngle=&gt;sza           0  y,x  Solar Zenith Angle<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/RelativeAzimuthAngle=&gt;raa       0  y,x  Relative Azimuth Angle<br>
/HDFEOS/GRIDS/OMI~Total~Column~Amount~SO2/Data~Fields/ViewingZenithAngle=&gt;vza         0  y,x  Viewing Zenith Angle<br>
ENDVARS<br>
<br>
<br>
Note the group paths to the data field variables must be specified in full, and any spaces converted to tilda (~) characters.<br>
<br>
You can rename the OMSO2e data files by removing the production date/time from the version (stuff after v003), then you would have<br>
a file name like OMI-Aura_L3-OMSO2e_2004m1001_v003.he5. With this you could modify the DSET (and add OPTIONS) to the .ctl file<br>
<br>
DSET  ^OMI-Aura_L3-OMSO2e_%ym%m%d_v003.he5<br>
OPTIONS template<br>
<br>
and then you could read in multiple files for a range of dates (remember to also adjust the TDEF range).<br>
<div><br>
------------------------------------------------------------------------------<br>
| James E. Johnson                      | address:                           |<br>
| Wyle Information Systems, Inc.        |  NASA Goddard Space Flight Center  |<br>
| e-mail: <a href="mailto:james.johnson@nasa.gov" target="_blank">james.johnson@nasa.gov</a>        |  Distributed Active Archive Center |<br>
| phone:  301-614-5121                  |  Code 610.2, Bldg 32, Room S130G   |<br>
| fax:    301-614-5268                  |  Greenbelt, MD  20771              |<br>
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</blockquote></div></div></div><br>
</blockquote></div><br>