[ncl-talk] cloudsat data
Anusha sathyanadh
anushacalicut at gmail.com
Sun Dec 14 22:45:40 MST 2014
Thank u very much...
this is exactly what i want.
I will try this...hope it works this time...thanks once again
On Sat, Dec 13, 2014 at 9:40 PM, Dennis Shea <shea at ucar.edu> wrote:
>
> I found the description.
>
>
> http://www.cloudsat.cira.colostate.edu/ICD/2B-CLDCLASS/2B-CLDCLASS_PDICD_5.0.pdf
>
> page 42
>
> -----------
> NCL has a function
>
> http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_gbits.shtml
>
> that can be used to extract bits. (bits 1-4)
>
> An example of usage is at:
>
> http://www.ncl.ucar.edu/Applications/HDF.shtml
>
> hdf4eos_5.ncl <http://www.ncl.ucar.edu/Applications/Scripts/hdf4eos_5.ncl>
>
> You could take Example 2/3 as a base and then use dim_gits
>
> Good luck
>
>
>
>
>
>
>
>
>
> On Sat, Dec 13, 2014 at 8:44 AM, Dennis Shea <shea at ucar.edu> wrote:
>>
>> This is offline.
>>
>> Do you have any documentation on how cloud_scenario was constructed?
>> I do not know IDL so the code is not useful to me.
>>
>> On Fri, Dec 12, 2014 at 11:03 PM, Anusha sathyanadh <
>> anushacalicut at gmail.com> wrote:
>>>
>>> Thank u very much for adding two more programs to the NCL cloudsat page..
>>> Actually, i have seen this long back and plotted too..
>>> my problem is not any of this..
>>> I want to know about the cloud classification algorithm and how to
>>> execute it..
>>> In short how to plot different clouds using cloud scenario values..
>>>
>>> the IDL program in this link
>>> http://www.cloudsat.cira.colostate.edu/code_library/cldclass_png.pro
>>> gives different clouds ..
>>>
>>>
>>> sorry to disturb you again and again..
>>>
>>> thanks a lot for ur support
>>>
>>> On Sat, Dec 13, 2014 at 2:43 AM, Dennis Shea <shea at ucar.edu> wrote:
>>>>
>>>> See Examples 2 & 3 at
>>>>
>>>> http://www.ncl.ucar.edu/Applications/cloudsat.shtml
>>>>
>>>> On Thu, Dec 11, 2014 at 2:57 AM, Anusha sathyanadh <
>>>> anushacalicut at gmail.com> wrote:
>>>>>
>>>>> Thank u very much..
>>>>>
>>>>> I will take care of the suggestions next time onwards..
>>>>>
>>>>> On Thu, Dec 11, 2014 at 5:09 AM, Dennis Shea <shea at ucar.edu> wrote:
>>>>>
>>>>>>
>>>>>> 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*
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *ANUSHA SATHYANADHSenior Research FellowDeparment of Atmospheric and
>>>>> Space SciencesPune university*
>>>>>
>>>>
>>>
>>> --
>>>
>>>
>>>
>>>
>>> *ANUSHA SATHYANADHSenior Research FellowDeparment of Atmospheric and
>>> Space SciencesPune university*
>>>
>>
--
*ANUSHA SATHYANADHSenior Research FellowDeparment of Atmospheric and Space
SciencesPune university*
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