.ctl for MODIS HDF file

[Hao He]

You are right. I found this:

o DTYPE netcdf and DTYPE hdfsds are DISABLED.

Do you know how to turn it on?

Hao

|  Hao He                                       |
|  Graduate Assistant                           |
|  CSS bldg 4365                                |
|  Jull Hall lab (301)405-7625                  |
|  Cellphone     (240)672-7912                  |
|  Department of Atmospheric & Oceanic Science  |
|  University of Maryland                       |
|  College Park, MD 20742                       |

On Mon, 19 Oct 2009, Jennifer Adams wrote:

> What is the output from 'q config' ?
>
> On Oct 19, 2009, at 3:49 PM, Hao He wrote:
>
>> I put this in my .ctl file as an example:
>>
>> set ^MOD06_L2.A2008094.0225.005.2008096042152.hdf
>> title MODIS Level 2 cloud product
>> undef -32768
>> xdef 270 linear 112.856 0.1201260
>> ydef 406 linear 29.1195 0.0525835
>> tdef 1 linear 02:25Z03APR2008 5MN
>> zdef 1 linear 1 1
>> dtype hdfsds
>> vars 3
>> Latitude=>scanlat 0 y,x Geodetic Latitude
>> Longitude=>scanlon 0 y,x Geodetic Longitude
>> Surface_Pressure=>sfcpres 0 y,x Surface Pressure
>> endvars
>>
>> But I got this warning:
>>
>> Scanning description file:
>> MOD06_L2.A2008094.0225.005.2008096042152.ctl
>> Open Error:  Data file type invalid
>> --> The invalid description file record is:
>> --> dtype hdfsds
>>
>> I am confused about the data type. Not HDF-SDS?
>>
>> Hao
>>
>> |  Hao He                                       |
>> |  Graduate Assistant                           |
>> |  CSS bldg 4365                                |
>> |  Jull Hall lab (301)405-7625                  |
>> |  Cellphone     (240)672-7912                  |
>> |  Department of Atmospheric & Oceanic Science  |
>> |  University of Maryland                       |
>> |  College Park, MD 20742                       |
>>
>> On Mon, 19 Oct 2009, Jennifer Adams wrote:
>>
>>> I can't allow misinformation to go out to the list uncorrected: GrADS
>>> can read any HDF file containing gridded fields.
>>> This particular HDF file contains swath data. It's gridded -- there
>>> are 406 cells in the along-swath direction, and 270 cells in the
>>> across-swath direction. GrADS will read this data, but only onto an
>>> abstract x,y grid. The lat/lon values of each grid point are read in
>>> as data variables. A full 'dtype hdfsds' descriptor file would
>>> include
>>> the following lines:
>>>
>>> xdef 270 linear 1 1
>>> ydef 406 linear 1 1
>>> tdef 1 linear ...
>>> ...
>>> vars 4
>>> Latitude=>scanlat 0  y,x  Geodetic Latitude
>>> Longitude=>scanlon 0 y,x Geodetic Longitude
>>> Scan_Start_Time=>scantime 0 y,x International Atomic Time at Start of
>>> Scan replicated across the Swath
>>> Surface_Temperature=>tsfc 0 y,x Surface_Temperature
>>> endvars
>>>
>>> You can add more variables, including some that have a Z axis,
>>> depending on what you'd like to look at in the file. The rest of the
>>> required descriptor file entries are discussed in the documentation
>>> page http://iges.org/grads/gadoc/SDFdescriptorfile.html
>>>
>>> --Jennifer
>>>
>>>
>>> On Oct 19, 2009, at 10:49 AM, Yan Libin wrote:
>>>> a ctl is not enough
>>>
>>> On Oct 19, 2009, at 10:49 AM, Jayakrishnan PR wrote:
>>>> ... we cannot open them through grads by writing a ctl file.
>>>
>>>
>>> On Oct 19, 2009, at 10:26 AM, Hao He wrote:
>>>
>>>> Hi,
>>>> I want to read MODIS HDF file by GrADS. Unfortunately both sdfopen
>>>> and
>>>> xdfopen do not work for me, so I need to write a complete .ctl file.
>>>> But
>>>
>>>> I am confused after reading the MODIS data set
>>>> (http://modis-atmos.gsfc.nasa.gov/MOD07_L2/format.html)
>>>
>>>> I am wondering if anyone has experience on it.
>>>> Thanks a lot!
>>>>
>>>> Hao
>
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>