[ncl-talk] cloudsat data
Rabah Hachelaf
hachelaf at sca.uqam.ca
Wed Dec 10 16:58:44 MST 2014
Hi all,
This link may help : http://hdfeos.org/zoo/index_openNSIDC_Examples.php
it contains several NCL example scripts to manage satellite data in HDF
format.
Rabah.
2014-12-10 18:39 GMT-05:00 Dennis Shea <shea at ucar.edu>:
>
> Please do not send direct emails to me. Only ncl-talk. The group is cc'd
> here.
>
> ncl-talk expects people to put in the time to learn the language.
> ncl-talk can not do programing for you.
> ====
>
> There are two excellent tutorials at:
> http://www.ncl.ucar.edu/Document/Manuals/
> Please look at the two DKRZ tutorials.
>
> ========
> As noted on ncl-talk many times, the key to data processing is *KNOW YOUR
> DATA*
>
> Please read the description of the 'ncl_filedump' command line operator.
> This provides an overview of a file's contents.
>
> http://www.ncl.ucar.edu/Document/Tools/ncl_filedump.shtml
>
> ========
>
> %> ncl_filedump 2010153190053_21792_CS_2B-
> CLDCLASS_GRANULE_P_R04_E03.hdf
>
> Copyright (C) 1995-2014 - All Rights Reserved
> University Corporation for Atmospheric Research
> NCAR Command Language Version 6.2.0
> The use of this software is governed by a License Agreement.
> See http://www.ncl.ucar.edu/ for more details.
>
> Variable: f
> Type: file
> filename: 2010153190053_21792_CS_2B-CLDCLASS_GRANULE_P_R04_E03
> path: 2010153190053_21792_CS_2B-CLDCLASS_GRANULE_P_R04_E03.hdf
> file global attributes:
> HDFEOSVersion : HDFEOS_V2.5 <=*=*=*=*=*=*=*=*=
> StructMetadata_0 : GROUP=SwathStructure <=*=*=*=*=*=*=*=*=
> GROUP=SWATH_1
> SwathName="2B-CLDCLASS"
> GROUP=Dimension
> OBJECT=Dimension_1
> DimensionName="nray"
> Size=37082
> END_OBJECT=Dimension_1
> OBJECT=Dimension_2
> DimensionName="scalar"
> Size=1
> END_OBJECT=Dimension_2
> OBJECT=Dimension_3
> DimensionName="nbin"
> Size=125
> END_OBJECT=Dimension_3
> END_GROUP=Dimension
>
> [SNIP ...]
> ++++++++++++++++++++
>
> Comment: This is a HDF-EOS file with a SWATH structure.
> Unfortunately HDFEOS is a separate format from classic HDF.
> In practice, a 2nd read must be implemented. NCL does this by
> appending a .he2 (or .hdfeos) suffix to the file name when reading the
> file. NCL merges
> the information from both reads. The hdf-eos part usually have latitude
> and longitude.
>
>
> %> ncl_filedump
> 2010153190053_21792_CS_2B-CLDCLASS_GRANULE_P_R04_E03.hdf.he2
>
> Copyright (C) 1995-2014 - All Rights Reserved
> University Corporation for Atmospheric Research
> NCAR Command Language Version 6.2.0
> The use of this software is governed by a License Agreement.
> See http://www.ncl.ucar.edu/ for more details.
>
> Variable: f
> Type: file
> filename: 2010153190053_21792_CS_2B-CLDCLASS_GRANULE_P_R04_E03.hdf
> path: 2010153190053_21792_CS_2B-CLDCLASS_GRANULE_P_R04_E03.hdf
> file global attributes:
>
> [SNIP ... you can ignore these here]
>
> dimensions:
> nray_2B_CLDCLASS = 37082
> scalar_2B_CLDCLASS = 1
> nbin_2B_CLDCLASS = 125
> variables:
> short cloud_scenario_2B_CLDCLASS ( nray_2B_CLDCLASS,
> nbin_2B_CLDCLASS )
> hdfeos_name : cloud_scenario
> valid_range : ( 0, 32767 )
> units : none
> long_name : Cloud scenario
> offset : 0
> factor : 1
> [SNIP]
> short Height_2B_CLDCLASS ( nray_2B_CLDCLASS, nbin_2B_CLDCLASS )
> hdfeos_name : Height
> _FillValue : -9999
>
> float Longitude_2B_CLDCLASS ( nray_2B_CLDCLASS )
> long_name : longitude
> units : degrees_east
> hdfeos_name : Longitude
>
> float Latitude_2B_CLDCLASS ( nray_2B_CLDCLASS )
> long_name : latitude
> units : degrees_north
> hdfeos_name : Latitude
>
> float Profile_time_2B_CLDCLASS ( nray_2B_CLDCLASS )
> hdfeos_name : Profile_time
>
>
> =========
> After looking at your file, it is *NOT* a latitude-longitude grid.
> It is a satellite swath (time, location, height_profile)
>
>
> Good luck
>
>
>
>
>
> On Wed, Dec 3, 2014 at 11:29 PM, Anusha sathyanadh <
> anushacalicut at gmail.com> wrote:
>
>> Dear Sir,
>>
>> I wish to know how to plot lat-lon contour maps like those shown here
>> https://www.ncl.ucar.edu/Applications/cloudsat.shtml, over Indian region
>> by using 2B-CLDCLASS data..Am attaching one of the data file along with ..
>>
>> On Wed, Dec 3, 2014 at 11:40 AM, Dennis Shea <shea at ucar.edu> wrote:
>>
>>> ncl-talk does not have any of these files readily available.
>>>
>>> wrt: 'how to plot lat-lon map using the data when the data is not on
>>> regular grids and is not a function of lat and lon separately'
>>> This is not clear ... ?lat and lon separately?
>>>
>>> The http://www.ncl.ucar.edu/Applications/Scripts/cloudsat_1.ncl
>>> example file had the lat and lon as part of the file.
>>>
>>> NCL can plt 'anything' if the lat/lon data are available.
>>> egL satellite swath data:
>>> http://www.ncl.ucar.edu/Applications/HDF.shtml
>>>
>>> More cloudsat info is at:
>>>
>>>
>>> http://www.cloudsat.cira.colostate.edu/dataICDlist.php?go=list&path=/2B-CLDCLASS
>>>
>>> Good luck
>>>
>>> On Tue, Dec 2, 2014 at 10:29 PM, Anusha sathyanadh <
>>> anushacalicut at gmail.com> wrote:
>>>
>>>> Dear NCL users,
>>>>
>>>> I have a doubt concerning how to to use cloudsat 2B-CLDCLASS data for
>>>> vertical and horizontal classification of clouds. the product gives
>>>> cloud_scenario and height with dimension of (nbin,nray). I have gone
>>>> through the ncl talks regarding this and tried the instructions listed. I
>>>> could plot the satellite path and height from the data. but I wish to know
>>>> how to plot lat-lon map using the data when the data is not on regular
>>>> grids and is not a function of lat and lon separately...
>>>> cloud reflectivity lat lon map is plotted in this program
>>>> https://www.ncl.ucar.edu/Applications/Scripts/cloudsat_1.ncl..is it
>>>> possible for cloud scenario??
>>>>
>>>>
>>>>
>>>>
>>>> waiting for your suggestions..
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>>
>>>>
>>>>
>>>> *ANUSHA SATHYANADHSenior Research FellowDeparment of Atmospheric and
>>>> Space SciencesPune university*
>>>>
>>>> _______________________________________________
>>>> ncl-talk mailing list
>>>> List instructions, subscriber options, unsubscribe:
>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>
>>>>
>>>
>>
>>
>> --
>>
>>
>>
>>
>> *ANUSHA SATHYANADHSenior Research FellowDeparment of Atmospheric and
>> Space SciencesPune university*
>>
>
>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
--
------------------------------
Cordialement,
Best regards,
Rabah Hachelaf
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20141210/bff5956c/attachment.html
More information about the ncl-talk
mailing list