[ncl-talk] cloudsat data
Dennis Shea
shea at ucar.edu
Wed Dec 10 16:39:51 MST 2014
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*
>
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