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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Matt,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I put together a control file and the only way that grads can
open that file is if the ‘dtype hdf4’ or ‘dtype hdfsds’<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So, even though the ncdump and hdfdump show it to be a netCDF
format, GrADS can only read it as hdf4.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Do you have a NASA link to the file specifications so I can
figure out the rest of the control file?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John Huddleston, PhD<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
gradsusr-bounces@gradsusr.org [mailto:gradsusr-bounces@gradsusr.org] <b>On
Behalf Of </b>Huddleston, John<br>
<b>Sent:</b> Friday, April 02, 2010 8:18 AM<br>
<b>To:</b> GrADS Users Forum<br>
<b>Subject:</b> Re: [gradsusr] SeaWIFS NDVI data<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Matt<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The BZ2 file in your previous email points to a netCDF file, see
the description from the file included here. Yes, GrADS can read this file
format. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>netcdf S20100652010072 {<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>dimensions:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> fakeDim0 = 4320 ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> fakeDim1 = 8640 ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>variables:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> short
l3m_data(fakeDim0, fakeDim1) ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
l3m_data:Fill = -1s ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
l3m_data:Scaling = "linear" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
l3m_data:Scaling Equation = "(Slope*l3m_data) + Intercept = Parameter
value" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
l3m_data:Slope = 1.4728233e-05f ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
l3m_data:Intercept = -0.050000001f ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>// global attributes:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Product Name = "S20100652010072.L3m_8D_LAND_NDVI_4km" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Sensor Name = "SeaWiFS" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Sensor = "SeaWiFS" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Title = "SeaWiFS Level-3 Standard Mapped Image" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Data Center = "" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Station Name = "" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Station Latitude = 0.f ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Station Longitude = 0.f ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>
:Mission = "SeaStar SeaWiFS" ;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John Huddleston, PhD<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
gradsusr-bounces@gradsusr.org [mailto:gradsusr-bounces@gradsusr.org] <b>On
Behalf Of </b>Matt Alonso<br>
<b>Sent:</b> Friday, April 02, 2010 6:21 AM<br>
<b>To:</b> GrADS Users Forum<br>
<b>Subject:</b> Re: [gradsusr] SeaWIFS NDVI data<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hi Ramon,<br>
<br>
I remember reading that GrADS could handle HDF files which is why I was so
surprised that I was having issues getting the data into GrADS; again I think
this is a user-error and not a problem w/GrADS itself.<br>
<br>
When I try to open the file in grads (v2.0.7a) using sdfopen it says that the
file has no discernable x-coordinate. I tried constructing a ctl file for
it as well but that too failed.<br>
<br>
I can't find the exact link right now but I'm 99.9% sure that the file is in
HDF format. I also attached the output of the GDAL (<a
href="http://gdal.org/">http://gdal.org/</a>) utility gdalinfo, the top line of
which says that the driver it is using is the "HDF4Image/HDF4
Dataset". I did a test plot of the data using gdal_translate to
convert it into a png and the output matches what is on NASA's site which leads
me to believe that GDAL is correct in interpreting this file as HDF(4).<br>
<br>
My interpretation of all of this could be way off though as I am really just
grasping for straws here.<br>
<br>
Thanks,<br>
Matt<o:p></o:p></p>
<div>
<p class=MsoNormal>On Fri, Apr 2, 2010 at 12:18 AM, Ramon Solano <<a
href="mailto:rsolanob@gmail.com">rsolanob@gmail.com</a>> wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal>Hello Matt,<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>GrADS has no problem working with HDF files, no matter if they
are projected or not; what matters is if they are stored as a regular grid. You
may have geolocation problems if the file is projected into something like a
sinusoidal or some other not so common projection, but still you can have
access to the actual data, do the processing and at the end to export the
results to your favorite software (ENVI, Imagine, etc).<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Of course, the first thing you need to have is the internal
structure of the data file (data type, dimensions, data layers, interleaving,
etc). I ran a HDF diagnostic utility on the file you mentioned and it appears
that the file does not contain any grid, are you sure it is a HDF file? Looks
more like a plain binary file, but that's just my guessing (HDF files are self
described).<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Regards,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Ramon<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif";
color:black'>---<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif";
color:black'><o:p> </o:p></span></p>
</div>
</div>
<div>
<div>
<div>
<div>
<p class=MsoNormal>On Mar 31, 2010, at 6:41 AM, Matt Alonso wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<div>
<div>
<p class=MsoNormal>Hi All,<br>
<br>
Sorry to bother folks w/this but I was wondering if anyone has had any success
working w/SeaWIFS data (<a
href="http://oceandata.sci.gsfc.nasa.gov/SeaWiFS/Mapped/8Day/NDVI/2010/"
target="_blank">http://oceandata.sci.gsfc.nasa.gov/SeaWiFS/Mapped/8Day/NDVI/2010/</a>)
in GrADS. I've been struggling w/creating the appropriate CTL for the HDF
data. When I open the most recent 8day composite 4km file (<a
href="http://oceandata.sci.gsfc.nasa.gov/cgi/getfile/S20100652010072.L3m_8D_LAND_NDVI_4km.bz2"
target="_blank">http://oceandata.sci.gsfc.nasa.gov/cgi/getfile/S20100652010072.L3m_8D_LAND_NDVI_4km.bz2</a>)
I'm having problems trying to read the file into GrADS. <br>
<br>
Any info on this matter would be greatly appreciated. Thanks in advance.<br>
<br>
Cheers,<br>
Matt<o:p></o:p></p>
</div>
</div>
<div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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