[gradsusr] xdfopen via opendap (developed from re Re: sdfopen with opendap file)

[Namba Takaya]

Dear Jim
Thank you for your advise. 
When I tried to access your SeaWiFS data I am requested to put the Nama and Passward likeTo view this page, you must log in to area “iprc_only” on apdrc.soest.hawaii.edu:80.Do I need to register or is it allowed for certain people?
Best Regards,Takaya Namba

> Date: Mon, 20 Jun 2011 09:57:48 -1000
> From: jimp at hawaii.edu
> To: gradsusr at gradsusr.org
> Subject: Re: [gradsusr] xdfopen via opendap (developed from re Re: sdfopen with opendap file)
> 
> Takaya:
> 
> I don't think that the template option works with data via OPeNDAP, only on
> local files. The data provider needs to aggregate the data on the server
> side
> of things. Otherwise, you will have to write your script to loop through
> all the
> files.
> 
> You are also welcome to get the Pathfinder SST from our site,
> http://apdrc.soest.hawaii.edu.
> The exact URL is:
> 
> http://apdrc.soest.hawaii.edu:80/dods/public_data/satellite_product/AVHRR/avhrr_mon
> 
> for the monthly values (and these are aggregated).
> 
> Jim
> 
> Namba Takaya wrote:
> > Dear Sir
> >
> > I tried to read the HDF file of pathfinder monthly sst via opendap
> >
> > Fortunately I could read the sst data by xdfopen and data descriptor
> > file(bsst.ctl) as bellow,
> > Then I tried to develop using % of DSET in the data descriptor file.
> > Then I have a problem explained below and could you tell me how to
> > solve the problem?
> >
> > Best Regards, Takaya Namba
> >
> > bsst.ctl (data descriptor file)
> >
> > DSET
> > http://data.nodc.noaa.gov/opendap/pathfinder/Version5.0/Monthly/1985/198501.s04m1pfv50-bsst-16b.hdf
> > options yrev
> > ***DSET
> > http://data.nodc.noaa.gov/opendap/pathfinder/Version5.0/Monthly/%y4/%y4%m2.s04m1pfv50-bsst-16b.hdf
> > TITLE This is a sample
> > UNDEF 99999.0
> > YDEF lat 4096 LINEAR -90 0.043945
> > XDEF lon 8192 LINEAR -180 0.043945
> > ***TDEF time 1 linear 00:00z1! 5JAN1985 1mo
> > VARS 1:
> > bsst=>bsst 1 99 surface temperature
> > ENDVARS
> >
> >
> > However, I would like to use
> > DSET
> > http://data.nodc.noaa.gov/opendap/pathfinder/Version5.0/Monthly/%y4/%y4%m2.s04m1pfv50-bsst-16b.hdf
> > instead of
> > DSET
> > http://data.nodc.noaa.gov/opendap/pathfinder/Version5.0/Monthly/1985/198501.s04m1pfv50-bsst-16b.hdf.
> > Because I would like to do all the thirty years from jan 1988 to 2009.
> >
> > I added the line in the bsst.ctl
> > TDEF time 1 linear 00:00z15JAN1985 1mo
> > and then
> > grads -cl batch-opendap.gs.
> >
> > However, the error comes like below,
> >
> > Error: nc_open failed to open file
> > http://data.nodc.noaa.gov/opendap/pathfinder/Version5.0/Monthly/%y4/%y4%m2.s04m1pfv50-bsst-16b.hdf
> > NetCDF: DAP server error
> > gadsdf: Couldn't i! ngest SDF metadata.
> > SDF Descriptor file bsst.ctl was not suc cessfully opened & parsed.
> >
> > I understand that I could not replace /%y4/%y4%m2 with /1985/198501 by
> > the data descriptor file.
> > Could you tell me how can I replace by the proper descriptor file as I
> > expected?
> >
> > (batch-opendap.gs grads script file)
> > 'set gxout shaded'
> > 'xdfopen bsst.ctl'
> > 'q file'
> > say result
> > 'set lat 10 50'
> > 'set lon 120 170'
> > 'set T 1'
> > 'set Z 1'
> > 'd bsst'
> > 'cbar'
> > 'quit'
> >
> >
> > dncdump -h
> > "http://data.nodc.noaa.gov/opendap/pathfinder/Version5.0/Monthly/1985/198501.s04m1pfv50-bsst-16b.hdf"
> >
> > is as below,
> >
> > netcdf 198501.s04m1pfv50-bsst-16b { // format variant: 64bit
> > dimensions:
> > lat = 4096 ;
> > &n! bsp; lon = 8192 ;
> > variables:
> > short bsst(lat, lon) ;
> > bsst:dsp_PixelType = 1b ;
> > bsst:dsp_PixelSize = 2b ;
> > bsst:dsp_Flag = 0s ;
> > bsst:dsp_nBits = 16s ;
> > bsst:dsp_LineSize = 0 ;
> > bsst:dsp_cal_name = "Temperature" ;
> > bsst:units = "Temp" ;
> > bsst:dsp_cal_eqnNumber = 2s ;
> > bsst:dsp_cal_CoeffsLeng! th = 8s ;
> > &n bsp; bsst:dsp_cal_coeffs = 0.075f, -3.f ;
> > bsst:scale_factor = 0.075f ;
> > bsst:add_off = -3.f ;
> >
> >
> >
> >
> >
> > ------------------------------------------------------------------------
> >
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